Ductless mini split heat pumps let you heat and cool a single room or an open floor plan without running new ductwork, and the right pick depends mostly on BTU size, voltage, and cold-weather heating performance. Among the fifteen systems I compared, the Senville LETO 24,000 BTU stands out as the best overall pick for large spaces thanks to its higher capacity and reputation for reliable inverter performance, while the Temprium 12,000 BTU at 22 SEER2 takes the efficiency crown for moderate rooms and the YITAHOME Wi-Fi and Alexa model wins on smart-home convenience. The main tradeoff in this category is between efficiency ratings and price at the 12,000 BTU level, where SEER2 numbers range from 17 to 22 across otherwise similar units. A second tension: budget brands like COSTWAY and Albott cost less up front but often have weaker low-temperature heating and shorter warranty support. Keep reading for the full breakdown of all fifteen systems, including which sizes fit which rooms and who should skip each model.
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Key Takeaways
- The 12,000 BTU segment is the most crowded and most variable: SEER2 ratings span from 17 (COSTWAY) to 22 (Temprium), so efficiency — not features — is what separates the top picks at this size.
- Senville‘s LETO lineup is the only one here offered in three capacities (9K, 12K, 24K), making it the strongest choice for buyers matching a whole home zone-by-zone with one brand.
- Five of the fifteen units run on 115V household power (Albott, YITAHOME, Tehanld, Temprium, and Rellytech‘s smaller models), which matters for DIY-adjacent installs where running a 230V circuit is a dealbreaker.
- Wi-Fi and voice control is still the exception, not the rule — only the YITAHOME Alexa-compatible model offers it, so smart-home buyers have far fewer options than efficiency-focused buyers.
- Rellytech appears four times across sizes, which suggests consistent design and support, but its SEER2 ratings trail Temprium and Tehanld at equivalent capacities.
| ductless mini split heat pump | Noise Level | Cooling Capacity | Voltage | Coverage Area |
|---|---|---|---|---|
| Filterbuy 18,000 BTU Mini Spli | As low as 32 dB | 18,000 BTU | 230V | Up to 850 sq ft |
| Rellytech 18,000 BTU Mini Spli | — | 18,000 BTU | 208–230V | Up to 1,250 sq ft |
| Albott 12,000 BTU Mini Split A | Below 29 dB | — | 115V | Up to 750 sq ft |
| COSTWAY 12,000 BTU Mini-Split | 23 dB (lowest setting) | 12,000 BTU | — | — |
| YITAHOME 12000 BTU Mini Split | Below 41 dB | — | 115V | Up to 750 sq ft |
| Tehanld 12000 BTU Mini Split A | 42 dB | 12,000 BTU | 115V | Up to 750 sq. ft. |
| Senville LETO 12,000 BTU Mini | 28 dB | 12,000 BTU | — | — |
| Senville LETO 9,000 BTU Mini S | — | 9,000 BTU | — | — |
| Rellytech 11,500 BTU Mini Spli | 29 dB | 11,500 BTU | — | Up to 550 sq. ft. |
| Temprium 12,000 BTU Mini-Split | As low as 23 dB | 12,000 BTU | 115V | — |
| Senville LETO 24,000 BTU Mini | 34 dB | 24,000 BTU | 208/230 V | — |
| Rellytech 9,000 BTU Mini Split | 42 dB | — | 115V | Up to 550 sq. ft. |
| Rellytech Mini Split AC/Heatin | 42 dB | 12,000 BTU | 115V | Up to 750 sq. ft. |
| Garvee 9,000 BTU Ductless Mini | 42 dB | — | 230V | Up to 750 sq. ft. |
| YITAHOME 12,000 BTU Ductless M | Below 41 dB | 12,000 BTU | 115V | Up to 750 sq. ft. |
More Details on Our Top Picks
Filterbuy 18,000 BTU Mini Split AC Heating System, 17 SEER2, 230V Ductless Inverter Heat Pump
This Filterbuy system earns the top spot for buyers heating and cooling a substantial room, thanks to its 18,000 BTU output and cold-climate performance down to 5°F. Where the smaller 12,000 BTU units in this lineup—the Albott and COSTWAY models—cap out around 750 sq ft, this one handles up to 850 sq ft with a variable-speed inverter that modulates instead of cycling on and off, which translates to steadier temperatures and lower running costs. The WiFi app and Alexa control give it an edge over the Rellytech 18,000 BTU, which lacks smart features entirely. The tradeoff is real, though: it demands 230V electrical service, so many homes will need an electrician’s visit on top of HVAC installation, and at 87 lbs it’s the heaviest indoor unit here.
Pros:- 17 SEER2 variable-speed inverter with eco-friendly R32 refrigerant keeps energy costs down
- Heats reliably down to 5°F, outperforming basic heat pumps in cold snaps
- WiFi app and Alexa voice control for remote scheduling and monitoring
- 7-year compressor and 3-year parts warranty with ETL and AHRI certification
- Ultra-quiet operation as low as 32 dB
Cons:- Requires 230V electrical service, which may mean added electrician costs
- Professional installation is mandatory, adding significantly to total cost
- Heavy 87 lb unit makes handling and mounting more involved
Best for: Homeowners with a large open living area or addition (600–850 sq ft) who want smart controls and reliable heat in cold winters
Not ideal for: Buyers with only standard 115V outlets available — the 230V requirement adds electrical work costs
- Cooling Capacity:18,000 BTU
- Efficiency:17 SEER2
- Voltage:230V
- Coverage Area:Up to 850 sq ft
- Refrigerant:R32
- Minimum Heating Temperature:5°F (-15°C)
- Noise Level:As low as 32 dB
- Smart Features:WiFi, Alexa, 24-hour timer, sleep mode, I Feel sensor
- Warranty:7-year compressor, 3-year parts
Our verdict“If you need serious capacity for a big room and your panel can supply 230V, this is the most complete package in the lineup.”
Rellytech 18,000 BTU Mini Split Air Conditioner and Heat Pump
The Rellytech’s standout trait is raw coverage: up to 1,250 sq ft, well beyond the Filterbuy’s 850 sq ft rating and far past the 750 sq ft ceiling of the 12,000 BTU units. That makes it the pick when one system needs to condition a whole floor or a large, hard-to-heat zone rather than a single room. Its heating capacity of 18,400 BTU slightly exceeds its cooling output, which matters if winter loads drive your decision. The compromises are clear compared to rivals: there’s no smart home integration, no published SEER2 rating, and no stated cold-climate heating floor—the Filterbuy guarantees operation to 5°F, and the YITAHOME specifies its operating range, while this one leaves you guessing. ECO mode and a 90° vertical swing help distribute air, but buyers prioritizing efficiency data should look elsewhere.
Pros:- Covers up to 1,250 sq ft — the largest coverage claim in this roundup
- Heating capacity of 18,400 BTU slightly exceeds cooling output
- Four modes (cooling, heating, fan, dry) plus ECO mode for energy savings
- 90° vertical swing airflow for better air distribution
Cons:- No smart features — no WiFi, app, or voice control
- No published SEER2 efficiency rating to compare running costs
- No stated minimum heating temperature for cold-climate confidence
Best for: Buyers conditioning a large open-plan floor, loft, or converted garage up to 1,250 sq ft with one system
Not ideal for: Efficiency-focused buyers who want verified SEER2 ratings, smart app control, or confirmed cold-weather heating performance
- Cooling Capacity:18,000 BTU
- Heating Capacity:18,400 BTU
- Coverage Area:Up to 1,250 sq ft
- Voltage:208–230V
- Modes:Cooling, heating, fan, dry, ECO
- Fan Speeds:4 (high, medium, low, auto)
- Airflow Swing:90° vertical
Our verdict“Choose this when square footage is the deciding factor; skip it if verified efficiency numbers and smart controls matter to you.”
Albott 12,000 BTU Mini Split Air Conditioner and Heater, SEER2 18, 115V
For a bedroom, nursery, or home office, noise is the spec that actually matters, and the Albott runs below 29 dB—quieter than the Filterbuy (32 dB) and dramatically quieter than the YITAHOME’s 41 dB. That difference is audible at night, and this model backs it up with a sleep mode and 24-hour timer. The 115V plug-in voltage removes the electrician visit the Filterbuy demands, and its 122°F upper operating limit beats the YITAHOME’s 118°F for hot attics or sunrooms. Compared with the COSTWAY at the same 12,000 BTU capacity, the Albott edges ahead on warranty structure (7-year parts, 5-year compressor) and stated efficiency. Its limitation is scale: at 750 sq ft maximum coverage, it simply can’t serve the large zones the Rellytech 18,000 BTU handles, and like every split system here it still needs professional install.
Pros:- Quietest operation in this lineup at below 29 dB
- Runs on standard 115V — no electrical panel upgrade needed
- Wide operating range from 5°F to 122°F for cold winters and hot summers
- SEER2 18 inverter with four modes including dehumidifying
Cons:- Professional installation still required, adding to total cost
- No smart home or WiFi control features mentioned
- Coverage capped at 750 sq ft
Best for: Light sleepers and anyone conditioning a bedroom, nursery, or quiet home office up to 750 sq ft on a standard outlet
Not ideal for: Owners of large open living spaces — 12,000 BTU won’t keep up beyond 750 sq ft
- Cooling/Heating Capacity:12,000 BTU
- Voltage:115V
- Efficiency:SEER2 18
- Coverage Area:Up to 750 sq ft
- Operating Temperature Range:5°F to 122°F
- Noise Level:Below 29 dB
- Modes:Cooling, heating, dehumidifying, fan
- Warranty:7-year parts, 5-year compressor
Our verdict“This pick makes the most sense for quiet-critical rooms where sub-29 dB operation matters more than smart features or raw capacity.”
COSTWAY 12,000 BTU Mini-Split Air Conditioner and Heater
The COSTWAY plays the value card: it matches the core functionality of pricier 12,000 BTU rivals—inverter compressor, four modes, R-32 refrigerant, self-cleaning, washable filter—while adding an outdoor-unit auto-defrost feature the Albott doesn’t advertise, which matters in climates where the condenser ices up. Its warranty structure is the strongest in this batch at 8 years on the compressor and 5 years on parts, outlasting the Albott’s coverage. What you give up is refinement: at 44.5 inches wide it’s a noticeably longer wall cassette than the YITAHOME’s 31.2 inches, there’s no WiFi or voice control like the YITAHOME offers, and its 23 dB noise figure refers to the lowest fan setting rather than guaranteed whisper operation across modes. Compared with the Filterbuy, it covers less area but avoids the 230V requirement.
Pros:- 8-year compressor and 5-year parts warranty — strongest coverage in this batch
- Inverter scroll compressor with ECO, sleep, timer, and turbo modes
- Outdoor-unit auto-defrost for reliable cold-weather operation
- Washable filter and self-cleaning function reduce maintenance
Cons:- No WiFi, app, or voice control — remote only
- Wide 44.5-inch indoor unit takes up considerable wall space
- Requires installation by a licensed HVAC installer
Best for: Budget-conscious buyers who want dependable heating and cooling for a mid-sized room without paying for smart features
Not ideal for: Tech-minded buyers who want app scheduling and voice control, or anyone with limited wall space for the 44.5-inch unit
- Cooling Capacity:12,000 BTU
- Functions:Cooling, heating, dehumidifying, fan
- Refrigerant:R-32
- Compressor:Inverter scroll compressor
- Noise Level:23 dB (lowest setting)
- Dimensions:9 × 44.5 × 13 in
- Warranty:8-year compressor, 5-year parts
Our verdict“A sensible, warranty-backed choice for a straightforward single-room install where smart features are nice-to-have, not need-to-have.”
YITAHOME 12000 BTU Mini Split Air Conditioner & Heater, 115V, 20 SEER2
The YITAHOME wins on connected convenience at a mid-range capacity: app, remote, and voice control all come standard, matching the Filterbuy’s smart feature set at 115V instead of 230V. Its 20 SEER2 rating is the highest stated efficiency among these five, edging the Albott’s 18 and beating the Filterbuy’s 17—which shows up on the electric bill over a full season. At 57.8 lbs and 31.2 inches wide, it’s the most compact and lightest unit here, making mounting easier than the COSTWAY’s 68 lb, 44.5-inch cassette. The honest downside: 41 dB operation is the loudest of the batch, so it’s a poor bedroom choice next to the Albott’s sub-29 dB rating, and the install kit omits the shut-off valve housing and side protection grille—small parts you’ll be buying separately before your HVAC tech arrives.
Pros:- Highest stated efficiency in this batch at 20 SEER2
- Full smart control via app, remote, and voice
- Lightest and most compact indoor unit at 57.8 lbs and 31.2 inches wide
- Runs on standard 115V with operation from 5°F to 118°F
Cons:- 41 dB noise level is the loudest among these picks
- Installation kit lacks shut-off valve housing and side protection grille
- Pre-charged refrigerant system is non-user serviceable
Best for: Smart-home enthusiasts with Alexa or Google setups who want app and voice control of a mid-sized room on a standard outlet
Not ideal for: Bedrooms and quiet spaces — 41 dB is the loudest indoor unit in this comparison
- Cooling Power:12,000 BTU
- Efficiency:20 SEER2
- Voltage:115V
- Coverage Area:Up to 750 sq ft
- Noise Level:Below 41 dB
- Refrigerant:R-32 (GWP 675)
- Operating Temperature Range:5°F to 118°F
- Control Methods:App, remote, voice
- Wattage:1040 watts
Our verdict“The right call if efficiency and voice/app control top your list and moderate noise isn’t a dealbreaker.”
Tehanld 12000 BTU Mini Split Air Conditioner & Heater with Heat Pump, 19 SEER2, 115V
This Tehanld unit makes the most sense for buyers who want a straightforward whole-room heating and cooling upgrade without paying for smart-home extras. Compared with the Senville LETO 12,000 BTU, it skips Alexa and app control but matches the cooling output and runs on ordinary 115V household power, which keeps installation simpler. The 19 SEER2 inverter rating means the compressor ramps up and down instead of cycling on and off, so energy bills stay modest across seasons. Its 42 dB rating is louder than the Senville or the Temprium, though — fine for a living room, less ideal for a light sleeper’s bedroom. The five-mode, four-fan-speed setup covers the basics, and the complete installation kit spares you from sourcing a line set separately. Just note the two-box shipping, which can split deliveries across days and complicate scheduling an installer.
Pros:- Full heating (12,500 BTU) and cooling (12,000 BTU) for spaces up to 750 sq. ft.
- 19 SEER2 inverter technology keeps seasonal energy use reasonable
- Runs on standard 115V household power
- Complete installation kit included in the box
Cons:- Professional installation required, adding to total cost
- 42 dB noise level is the loudest in this batch
- Ships in two separate packages that may arrive days apart
Best for: Homeowners outfitting a 500–750 sq. ft. living room, garage conversion, or addition who want full heating and cooling on standard 115V power
Not ideal for: Bedroom installs where 42 dB could disturb light sleepers — the Rellytech 11,500 BTU or Temprium run far quieter
- Cooling Capacity:12,000 BTU
- Heating Capacity:12,500 BTU
- Coverage Area:Up to 750 sq. ft.
- Voltage:115V
- Noise Level:42 dB
- Refrigerant:R-32
- Modes:Cool, Heat, Auto, Fan, Dry
- Timer:24-hour programmable
Our verdict“A sensible pick for a mid-size room where smart features matter less than getting reliable heat pump performance on household voltage.”
Senville LETO 12,000 BTU Mini Split Air Conditioner and Heat Pump
The LETO 12,000 BTU stands out for buyers who want their HVAC tied into a voice assistant and phone app alongside a handheld remote — a control trio the Tehanld and Rellytech models don’t offer. Compared with its smaller sibling, the Senville LETO 9,000 BTU, this version covers roughly twice the square footage while keeping the same quiet 28 dB indoor operation and 5°F cold-weather heat pump threshold. That low noise figure makes it far better suited to bedrooms and home offices than the 42 dB Tehanld. The five-year parts and compressor warranty is the strongest coverage in this batch next to the Rellytech’s five-year limited plan — though neither covers labor, so a failed compressor still means paying a technician. Its 1,020-watt draw under cooling is also the lowest in this group, which translates to lower running costs in mixed climates.
Pros:- Alexa, app, and remote control options in one system
- Very quiet 28 dB indoor operation
- Heats reliably down to 5°F outdoor temperatures
- 5-year parts and compressor warranty included
Cons:- Warranty excludes labor costs entirely
- Professional installation required
- Only 16 ft of line set included, which limits placement options
Best for: Smart-home households with Alexa routines who want app, voice, and remote control of a 550–750 sq. ft. space
Not ideal for: DIYers hoping to self-install — the split system design and refrigerant work demand a licensed professional, and labor isn’t warrantied
- Cooling Capacity:12,000 BTU
- Noise Level:28 dB
- Heating Range:Functional down to 5°F (-15°C)
- Controls:Remote, Alexa, app
- Refrigerant:R-454B
- Wattage:1,020 watts
- Line Set Length:16 ft
- Warranty:5 years parts and compressor
Our verdict“The strongest choice for connected homes that want quiet, efficient climate control they can command from anywhere.”
Senville LETO 9,000 BTU Mini Split Air Conditioner and Heat Pump
This 9,000 BTU LETO is the right-sized option when a 12,000 BTU unit would be overkill. Oversizing a mini split causes short cycling and poor dehumidification, so for a bedroom, nursery, or small office, this smaller capacity actually performs better than the larger Tehanld or Temprium units. It inherits the same strengths as its 12,000 BTU sibling — Alexa and app control, heat pump operation down to 5°F, and the 10-year combined warranty coverage (five on parts, five on the compressor) — while the pre-charged refrigerant covers line runs up to 25 ft, giving installers more placement flexibility than the standard 16 ft kits elsewhere in this lineup. Its UL Listing and AHRI certification give independently verified performance data, something several budget brands here can’t claim. The tradeoff is raw output: in a hot climate or an open-plan space, it will struggle where the Rellytech 11,500 BTU wouldn’t.
Pros:- Properly sized capacity prevents short cycling in small rooms
- Alexa and app control with a turbo function for fast pull-down
- UL Listed and AHRI Certified for verified performance
- Pre-loaded refrigerant supports line runs up to 25 ft
Cons:- Requires professional installation
- Warranty excludes labor
- Capacity caps out quickly as room size grows
Best for: Owners of bedrooms, home offices, or roughly 350–450 sq. ft. rooms who want certified performance and smart control without overpaying for capacity
Not ideal for: Large or open-plan living areas — 9,000 BTU will run constantly without catching up, unlike the 12,000 BTU Senville
- Cooling Capacity:9,000 BTU
- Modes:Air conditioning, heating, dehumidifier, fan
- Heating Range:Functional down to 5°F (-15°C)
- Smart Home:Works with Alexa
- Certifications:UL Listed, AHRI Certified
- Line Set:16 ft included; refrigerant pre-loaded for up to 25 ft
- Warranty:5 years parts + 5 years compressor (no labor)
Our verdict“The best-fit choice for small rooms where right-sizing beats raw power and verified specs matter.”
Rellytech 11,500 BTU Mini Split AC/Heating System, 17 SEER2 Ductless Inverter
Where this Rellytech separates itself is operating range: it heats down to -4°F outdoors, well beyond the 5°F floor of the Senville LETO units, and keeps cooling even at 122°F outside. For buyers in the Upper Midwest or mountain states, that difference decides whether the heat pump carries the winter or the backup space heater does. Its 29 dB rating puts it near-silent — a clear step up from the 42 dB Tehanld — and the one-touch self-cleaning plus tool-free washable filter cut routine maintenance to minutes. Compared with the Temprium 12,000 BTU, the tradeoff is clear: the Temprium is more efficient (22 SEER2 vs. 17 SEER2) and adds voice control, but the Rellytech’s five-year limited warranty dwarfs the Temprium’s single year. The catch is electrical — it’s hardwired with no power cord included, so budget for an electrician alongside the HVAC tech.
Pros:- Heats down to -4°F and cools at up to 122°F outdoor temperatures
- Ultra-quiet 29 dB operation suits bedrooms
- One-touch self-cleaning and tool-free washable filter
- 5-year limited warranty with ETL and AHRI verification
Cons:- Hardwired installation with no power cord included
- Requires professional HVAC install with vacuum-pumping
- Ships in two separate packages that may arrive apart
Best for: Cold-climate homeowners replacing window ACs and space heaters who need heat pump output that survives sub-zero nights
Not ideal for: Renters and anyone wanting plug-and-play setup — hardwiring plus vacuum-pumping means two trades and real installation cost
- Cooling Capacity:11,500 BTU
- Coverage Area:Up to 550 sq. ft.
- Heating Range:Down to -4°F
- Noise Level:29 dB
- Power:115V, hardwired
- Line Set:16.42 ft
- Warranty:5-year limited
Our verdict“The pick for harsh-winter regions where other heat pumps in this batch simply shut off.”
Temprium 12,000 BTU Mini-Split Air Conditioner and Heat Pump, 115V, 22 SEER2
At 22 SEER2, the Temprium is the most efficient unit in this batch — meaningfully ahead of the Tehanld’s 19 SEER2 and the Rellytech’s 17 — and its 780-watt cooling draw is the lowest power consumption here despite matching 12,000 BTU output. For anyone running the system most of the year, that efficiency gap compounds into real savings on monthly bills. It’s also the quietest pick at 23 dB, quieter even than the Senville LETO’s 28 dB, and it layers on Wi-Fi app plus Alexa and Google voice control with seven operating modes including an Eco setting. The weak point is confidence: the one-year warranty is the shortest in this roundup, versus five years from Rellytech and Senville. For a brand you may not have an HVAC contractor familiar with, that thin coverage is the reason it isn’t ranked higher despite the best specs on paper.
Pros:- Highest efficiency in the batch at 22 SEER2 with just 780 watts of draw
- Quietest operation here at 23 dB
- Wi-Fi app plus Alexa and Google Assistant voice control
- Washable filter and high-temperature self-cleaning function
Cons:- Only a 1-year manufacturer warranty
- Requires a new outdoor unit, so it can’t replace an existing condenser
- Cold-weather floor of 5°F trails the Rellytech’s -4°F rating
Best for: Efficiency-focused buyers in moderate climates who run their system year-round and want the lowest operating cost per hour
Not ideal for: Buyers prioritizing long-term reliability coverage — the 1-year warranty offers far less protection than Rellytech’s or Senville’s 5-year terms
- Cooling Capacity:12,000 BTU
- Heating Capacity:12,300 BTU
- Coverage:Up to 750 sq. ft.
- Noise Level:As low as 23 dB
- Voltage:115V
- Power Consumption:780 watts
- Modes:Auto, Cool, Heat, Dry, Fan, Sleep, ECO
- Warranty:1 year
Our verdict“The lowest-cost-to-run choice if you accept the shortest warranty in exchange for class-leading efficiency and silence.”
Senville LETO 24,000 BTU Mini Split Air Conditioner and Heat Pump
Most units in this roundup top out around 12,000–18,000 BTU, which is why the Senville LETO 24,000 earns its spot: it is the only option here sized for genuinely large zones. Where the Rellytech 12,000 BTU covers a single large bedroom, this model handles open-concept living areas, converted garages, or sunrooms where a smaller unit would run constantly without catching up. The inverter compressor modulates output instead of cycling on and off, which translates to steadier temperatures and lower running costs at this capacity. Alexa and app control add convenience that the similarly priced Garvee 9,000 matches, but with a third of the output. The tradeoff is scale: it runs on 208/230V, so standard 115V household circuits will not power it, and a 16-foot line set limits how far the indoor unit can sit from the condenser.
Pros:- 24,000 BTU output is the largest capacity in this roundup, suited to big open spaces
- Inverter technology keeps temperatures steady and running costs down
- Four operating modes plus Alexa and app control
- Installation kit with 16-foot line set and five-year parts and compressor warranty included
Cons:- Requires a 208/230V circuit, which many homes lack without an electrician
- Warranty covers parts only, not labor, so a compressor failure still means a service bill
- Professional installation is mandatory
Best for: Homeowners with large open-plan rooms, additions, or garages between 900 and 1,500 square feet who need serious capacity from a single zone
Not ideal for: Renters or anyone without a 208/230V circuit available, since standard household outlets cannot power this unit
- Cooling capacity:24,000 BTU
- Voltage:208/230 V
- Noise level:34 dB
- Inverter:Yes
- Operating modes:Cooling, heating, dehumidifying, air circulation
- Included line set:16 ft
- Warranty:5 years on parts and compressor
Our verdict“This is the pick when one zone needs real horsepower and a 12,000 BTU unit would be undersized.”
Rellytech 9,000 BTU Mini Split AC/Heating System, 19 SEER2, 115V
An 8-year warranty is rare at this price tier — the Senville LETO 24,000 offers five years, and most budget brands in this space offer less — and that alone justifies this model’s place. The Rellytech 9,000 pairs that coverage with a 19 SEER2 rating, so a bedroom or home office stays comfortable without the energy bill climbing the way it would with a less efficient unit running all summer. Compared to the Garvee 9,000, it gives up WiFi app control but gains ETL and AHRI certification, meaning its efficiency claims are independently verified rather than self-reported. Sleep mode dims the display and drops operation to a quiet 42dB, which matters in a room you actually sleep in. The limitation is straightforward physics: 550 square feet of coverage means a small apartment or a single room, nothing more.
Pros:- 8-year warranty is the longest in this roundup
- 19 SEER2 efficiency with ETL and AHRI certification for verified performance
- Sleep mode with LED-off function keeps bedrooms dark and quiet
- Four fan speeds and 24-hour timer allow fine-tuned scheduling
Cons:- No WiFi or smart-home integration, unlike the Garvee and YITAHOME models
- Coverage caps at 550 square feet
- Professional installation required
Best for: Buyers furnishing a bedroom, nursery, or home office up to 550 square feet who want the longest warranty protection available in this lineup
Not ideal for: Anyone hoping to condition a large living area, since 9,000 BTU runs out of reach beyond a single small-to-mid room
- Capacity:9,000 BTU cooling / 9,000 BTU heating
- Coverage area:Up to 550 sq. ft.
- Voltage:115V
- Noise level:42 dB
- Efficiency:19 SEER2 / 8.5 HSPF2
- Modes:Cooling, heating, fan, dry, ECO, sleep
- Warranty:8 years
Our verdict“The smart choice for a single small room where verified efficiency and long warranty coverage matter more than app control.”
Rellytech Mini Split AC/Heating System, 12000 BTU, 19 SEER2, 115V
This is the sweet spot of the roundup: enough output for a real living space, a standard 115V plug, and the same 8-year warranty that makes the smaller Rellytech 9,000 appealing. With 12,500 BTU of heating — slightly more than its cooling output — it holds up better in shoulder seasons than models rated identically for both directions. Against the YITAHOME 12,000, the comparison comes down to priorities: YITAHOME adds WiFi and Alexa, while this Rellytech counters with a lower operating floor of 61°F and the same certified 19 SEER2 efficiency. The ECO function nudges down compressor output when full capacity is unneeded, which shows up on the meter over a full season. It is not the cheapest 12,000 BTU option here, and like every split system in this guide, it is not a DIY project despite arriving with everything but the installer.
Pros:- 12,500 BTU heating output slightly exceeds cooling, improving cold-season performance
- 19 SEER2 with AHRI certification keeps energy costs predictable
- ECO mode and 24-hour timer support efficient daily operation
- 8-year warranty matches the best coverage in this lineup
Cons:- No WiFi or voice control, unlike the YITAHOME or Senville models
- Professional HVAC installation adds meaningfully to total cost
- Caps out at 750 square feet of coverage
Best for: Homeowners conditioning a main living area, large bedroom, or studio up to 750 square feet who want balanced heating and cooling with long warranty coverage
Not ideal for: Smart-home enthusiasts who want voice control and app scheduling, since this model relies on remote only
- Cooling capacity:12,000 BTU
- Heating capacity:12,500 BTU
- Coverage area:Up to 750 sq. ft.
- Voltage:115V
- Noise level:42 dB
- Efficiency:19 SEER2 / 8.5 HSPF2
- Certifications:ETL, AHRI
- Warranty:8 years
Our verdict“A dependable, certified, no-frills choice for a mid-size room where warranty length and efficiency outrank smart features.”
Garvee 9,000 BTU Ductless Mini Split Air Conditioner with Heat Pump, 18.5 SEER
What separates the Garvee 9,000 from every other small unit here is its operating range of -13°F to 122°F. The YITAHOME 12,000 shuts down below 5°F; this one keeps producing heat through freezes that would sideline most budget heat pumps. That makes it the right fit for a four-season cabin, a drafty garage workshop, or any northern-climate room where heating is the primary job. In milder conditions, the comparison shifts: the Rellytech 9,000 matches its quiet 42dB operation while beating it slightly on efficiency at 19 SEER2 versus 18.5 SEER. Garvee answers with WiFi and remote control, which Rellytech omits entirely. The logistics quirks are real but manageable — it ships as two packages, and the compressor needs to stand upright for 24 hours before installation, so plan the installer’s visit accordingly.
Pros:- Operates from -13°F to 122°F, the widest temperature range in this roundup
- WiFi and remote control included
- 4-in-1 modes with inverter compressor for efficient modulation
- Complete installation kit included
Cons:- Requires 230V power, ruling out standard 115V outlets
- Ships in two separate packages and needs 24 hours upright before install
- 18.5 SEER trails the certified 19 SEER2 Rellytech units
Best for: Buyers in cold regions who need reliable heat output down to -13°F for a bedroom, cabin, or workshop up to 750 square feet
Not ideal for: Mild-climate buyers chasing maximum efficiency, since the Rellytech models edge it out on SEER at the same size
- Cooling power:9,000 BTU
- SEER:18.5
- Coverage area:Up to 750 sq. ft.
- Operating temperature range:-13°F to 122°F
- Voltage:230V
- Noise level:42 dB
- WiFi enabled:Yes
Our verdict“The small-capacity pick for places where winter actually gets cold and other budget heat pumps quit.”
YITAHOME 12,000 BTU Ductless Mini Split Air Conditioner and Heat Pump, 115V, Wi-Fi and Alexa Compatible
If your household already runs on Alexa routines, this is the 12,000 BTU unit that fits in. The YITAHOME offers WiFi and Alexa control plus five operating modes — adding a dedicated auto mode that the Rellytech 12,000 skips — so you can tell it to cool the room before you walk in the door. At below 41 dB, it is the quietest specification in this batch, a real advantage over the 42 dB Rellytech and Garvee units if the air handler sits above a bed. Its 50-foot maximum airflow distance helps push conditioned air across long rooms. The tradeoffs are in the details: the shutoff valve housing and side protection grille are excluded from the box, a small but annoying gap compared to Garvee’s complete kit, and its heating floor of 5°F means northern buyers should look at the Garvee instead.
Pros:- Wi-Fi and Alexa compatibility for remote and voice control
- Quietest rated operation in this batch at below 41 dB
- Five modes including auto, with a wide 60°F–90°F setpoint range
- Washable air filter and installation kit included
Cons:- Shutoff valve housing and side protection grille are not included
- Heating shuts off below 5°F, limiting cold-region usefulness
- Ships in two packages that may arrive on different days
Best for: Smart-home households conditioning a 750-square-foot room who want voice control, scheduling, and the quietest operation in this lineup
Not ideal for: Cold-climate buyers, since the unit stops heating below 5°F where the Garvee keeps working to -13°F
- Cooling capacity:12,000 BTU
- Voltage:115V
- Coverage area:Up to 750 sq. ft.
- Noise level:Below 41 dB
- Operating temperature range:5°F–118°F
- Smart compatibility:Wi-Fi and Alexa
- Modes:Auto, cool, dry, heat, fan
- Certifications:ETL and AHRI
Our verdict“The best-connected 12,000 BTU option here for mild-to-moderate climates, provided you budget for the missing install accessories.”
How We Picked
I evaluated these fifteen ductless mini split heat pumps on four buyer-facing criteria: capacity fit, efficiency (SEER2), electrical requirements, and cold-climate heating capability. Capacity came first because an undersized heat pump runs constantly and an oversized one short-cycles, so I grouped the lineup by room size — 9,000 BTU for bedrooms and offices, 12,000 BTU for living areas around 450–550 square feet, and 18,000–24,000 BTU for large rooms, garages, and open floor plans. Efficiency separated the leaders within each size group, since a jump from 17 to 22 SEER2 translates into measurable savings on summer electricity bills over a decade of ownership.
Beyond specs, I weighed installation practicality (115V plug-in-adjacent designs versus 230V dedicated circuits), included accessories like pre-charged line sets and installation kits, and warranty terms where they differ meaningfully. Models with included install kits and standard voltage ranked higher for first-time buyers, while higher-capacity 230V systems were judged on raw performance and durability instead. The ranking favors units that balance efficiency with realistic install requirements — a 22 SEER2 unit you can’t wire up is worth less than a 19 SEER2 unit you can.
| ductless mini split heat pump | Coverage Area |
|---|---|
| Filterbuy 18,000 BTU Mini Spli | Up to 850 sq ft |
| Rellytech 18,000 BTU Mini Spli | Up to 1,250 sq ft |
| Albott 12,000 BTU Mini Split A | Up to 750 sq ft |
| COSTWAY 12,000 BTU Mini-Split | — |
| YITAHOME 12000 BTU Mini Split | Up to 750 sq ft |
| Tehanld 12000 BTU Mini Split A | Up to 750 sq. ft. |
| Senville LETO 12,000 BTU Mini | — |
| Senville LETO 9,000 BTU Mini S | — |
| Rellytech 11,500 BTU Mini Spli | Up to 550 sq. ft. |
| Temprium 12,000 BTU Mini-Split | — |
| Senville LETO 24,000 BTU Mini | — |
| Rellytech 9,000 BTU Mini Split | Up to 550 sq. ft. |
| Rellytech Mini Split AC/Heatin | Up to 750 sq. ft. |
| Garvee 9,000 BTU Ductless Mini | Up to 750 sq. ft. |
| YITAHOME 12,000 BTU Ductless M | Up to 750 sq. ft. |
Factors to Consider When Choosing Ductless Mini Split Heat Pumps
Before settling on a specific model, it helps to understand the sizing, electrical, and climate factors that make or break a mini split installation. These are the issues that most often cause buyer regret in this category.Size for the Room You Have, Not the Room You Wish You Had
BTU capacity is the single biggest factor in satisfaction with a ductless mini split, and it’s also where most buyers go wrong. A 9,000 BTU unit like the Rellytech or Garvee handles a bedroom or home office up to about 350 square feet, while 12,000 BTU covers a typical living room, and 18,000–24,000 BTU models suit open floor plans, garages, or additions. The common mistake is upsizing ‘for safety’ — an oversized heat pump short-cycles, which wastes energy, leaves humidity uncontrolled, and wears out the compressor faster. Also adjust upward about 10% for rooms with tall ceilings, intense sun exposure, or poor insulation, and downward for shaded, well-sealed spaces. If your room sits near the boundary between two sizes, choose the larger unit only if the space has heat-gaining features; otherwise the smaller unit will run more efficiently at partial load, which is exactly what inverter compressors are built for.
Voltage and Electrical Work: The Hidden Cost
Every unit in this lineup runs on either 115V or 230V, and that difference can add hundreds of dollars to your install. The 115V models — Albott, YITAHOME, Tehanld, Temprium, and the smaller Rellytechs — can often share a standard household circuit, making them far friendlier for retrofit projects in older homes. The 230V systems, including the Filterbuy 18,000 BTU and Senville LETO 24,000, require a dedicated circuit run from your breaker panel, which means an electrician and a permit in most jurisdictions. Don’t assume the higher price of a bigger unit is the whole cost difference; the electrical work frequently exceeds the equipment gap. If your panel is full or your space is far from it, a slightly less efficient 115V model may actually be the smarter total-cost choice despite a lower SEER2 number.
SEER2 and What Efficiency Actually Saves You
SEER2 measures cooling efficiency under updated 2023 testing standards, and within this lineup it ranges from 17 to 22 — a wider spread than many buyers expect in a single price band. The practical impact depends on your climate and runtime: in a hot region where the unit runs May through September, the gap between a 17 and 22 SEER2 12,000 BTU unit can pay back the price difference in a few seasons. In a mild climate or a rarely used guest room, the efficiency gap matters much less than warranty coverage or noise level. One pattern from this comparison: efficiency doesn’t track brand size — the lesser-known Temprium beats the established Senville on paper, so check the SEER2 of the specific model rather than relying on brand reputation. Also remember SEER2 covers cooling; heating efficiency (HSPF) matters just as much if you’re buying this primarily as a winter heat source.
Cold-Weather Heating Limits
Every heat pump here works as a heater, but not equally well when temperatures drop into the twenties and below. Standard inverter units like most of these lose heating capacity as outdoor temps fall, and many budget models drop off sharply below around 5°F, while true cold-climate heat pumps hold rated output to -13°F or lower. None of the fifteen units here are marketed as full cold-climate models, so if you live somewhere with sustained sub-freezing winters, plan on a backup heat source or accept reduced output during cold snaps. Check the lowest operating temperature in each spec sheet — it’s usually listed as heating range — and treat it as a real limit, not a suggestion. Buyers in the South or Pacific Northwest can safely prioritize efficiency and price over cold performance, which is why the ranking here leans toward SEER2 rather than low-temp output.
Installation: DIY Reality Check
Several of these units ship with installation kits and pre-charged line sets, which tempts buyers into full DIY installs. The indoor/outdoor mounting, line-set routing, and condensate drainage are genuinely manageable for a competent DIYer, but the refrigerant connections and vacuum pull-down require a gauge set and vacuum pump that most homeowners don’t own. An improperly evacuated system loses capacity, and refrigerant leaks are both an environmental issue and a legal gray area for unlicensed handling. A middle path works well for many buyers: mount everything yourself and hire an HVAC tech for an hour to make the final connections and pull the vacuum. Budget brands sometimes skip clear documentation, which is another reason first-timers tend to be happier with Senville’s LETO series, where instructions and community knowledge are more mature.
Smart Features and Zoning Strategy
In this roundup, only the YITAHOME 12,000 BTU offers Wi-Fi and Alexa compatibility, which tells you something about the category: smart features are still a premium add-on rather than a baseline. If voice control and app scheduling matter to you, your shortlist shrinks dramatically and the YITAHOME model earns its spot almost by default. For everyone else, a basic remote with timer and sleep mode covers 90% of real-world use. Also think ahead about zoning — if you plan to condition multiple rooms over time, buying from a single line like Senville’s three-size LETO family keeps controls, aesthetics, and warranty terms consistent. Mixing brands room by room saves a little up front but creates a drawer full of incompatible remotes and apps, which becomes annoying faster than most buyers expect.
Frequently Asked Questions
Can I install one of these mini splits myself, or do I need an HVAC professional?
The mounting and wiring portions are realistic for an experienced DIYer, and units that ship with pre-charged line sets and install kits — like the Rellytech 9,000 BTU and the YITAHOME models — are designed with that in mind. The sticking point is refrigerant work: connecting the lines and pulling a proper vacuum requires a manifold gauge set and vacuum pump, and skipping the vacuum step is the most common cause of poor performance and early compressor failure. A practical compromise is to mount the indoor and outdoor units and route the line set yourself, then pay an HVAC tech for an hour or two to finalize connections. Also confirm local code requirements, since many jurisdictions require a licensed tech for refrigerant handling regardless of skill level. Factor that labor into your budget before choosing between a DIY-friendly 115V unit and a 230V system that also needs an electrician.
Is a 12,000 BTU mini split big enough for my living room?
A 12,000 BTU unit is sized for roughly 450–550 square feet under normal conditions, which covers most apartments and typical living rooms. That number shifts with your insulation quality, ceiling height, sun exposure, and climate — a drafty 500-square-foot room in Texas may need the 18,000 BTU Filterbuy instead, while a well-insulated 500-square-foot room in a mild climate is a perfect match. Watch for the short-cycling trap: buying 24,000 BTU ‘to be safe’ in a small room actually reduces comfort because the unit can’t dehumidify properly during cooling. Measure your room honestly, add about 10% capacity for poor insulation or heavy sun, and if you’re between sizes, lean smaller for efficiency or larger only if the space has known heat-gain problems. For rooms under 350 square feet, a 9,000 BTU unit like the Rellytech or Garvee is the better fit.
How much does the SEER2 difference between these models actually matter?
The spread in this roundup runs from 17 to 22 SEER2, and the payoff depends almost entirely on how many hours a year the unit runs. In a hot climate where the compressor works from late spring through early fall, the difference between a COSTWAY at 17 SEER2 and a Temprium at 22 SEER2 on a 12,000 BTU unit can add up to real money over a decade — often more than the price gap between the two units. In a mild climate or a room used occasionally, the savings shrink to the point where warranty coverage, noise, or install convenience should drive your decision instead. One thing the comparison made clear: efficiency doesn’t follow brand reputation, so compare the specific SEER2 of each model rather than assuming bigger names win. Remember too that SEER2 measures cooling; if heating is your main use, look at the heating capacity and low-temperature performance first.
What’s the difference between the 115V and 230V models here, and which do I need?
Voltage determines your installation path more than your performance. The 115V models — including the Albott, both YITAHOME units, the Tehanld, the Temprium, and the smaller Rellytechs — can run on standard household circuits, which matters if you’re installing in a garage, shed, or older home without spare panel capacity. The 230V systems, like the Filterbuy 18,000 BTU and Senville LETO 24,000 BTU, require a dedicated double-pole circuit run by an electrician, adding cost and scheduling complexity. Performance-wise, 230V units tend to be the higher-capacity options simply because big compressors draw more current than a standard circuit safely supplies. If your target space already has 230V service (common in workshops and laundry areas), the larger units become much more attractive. If not, weigh the electrician’s bill against the convenience of a plug-compatible 115V design.
Will one of these heat pumps work as my only heat source in winter?
It depends heavily on your winter temperatures. All fifteen units provide heat down to some specified outdoor temperature, but standard inverter mini splits — which describes this entire lineup — lose heating capacity as it gets colder, and most drop off substantially below roughly 5°F. If you’re in the Southeast, the Pacific Northwest, or a mild coastal climate, one of these can plausibly serve as a primary heat source, though the Senville LETO 24,000 BTU gives the most margin for cold nights. In the Midwest, Northeast, or mountain states, plan on keeping a backup — baseboard heaters, a wood stove, or existing furnace — for cold snaps, because a struggling heat pump runs constantly and sends your electric bill soaring. Check the listed minimum heating temperature for any model you’re considering and treat it as a hard operating floor. Buyers in genuinely cold zones should research true cold-climate heat pumps, which sit above this price band, before committing.
Conclusion
Matching the right ductless mini split heat pump to your situation comes down to room size, electrical reality, and how much winter cold you expect. For the best overall pick, the Senville LETO 24,000 BTU delivers the most heating and cooling muscle here with a proven platform — ideal for large spaces, garages, and open floor plans, provided you can run a 230V circuit. The best value belongs to the Rellytech 12,000 BTU at 19 SEER2, which balances efficiency, a 115V design, and an included install kit at a mid-pack price. For best efficiency, the Temprium 12,000 BTU at 22 SEER2 leads the field and makes the most sense for hot climates with long cooling seasons.
Beginners and first-timers should lean toward the Senville LETO 12,000 BTU or the YITAHOME Wi-Fi and Alexa model — the former for mature documentation and support, the latter for smart-home buyers who want app and voice control. Small-space buyers — bedrooms, offices, and sheds under 350 square feet — are best served by the Rellytech 9,000 BTU or Garvee 9,000 BTU, while budget-conscious buyers covering a modest room can accept the tradeoffs of the Albott or COSTWAY 12,000 BTU units: lower efficiency and shorter track records in exchange for a lower entry cost. Whatever you choose, size honestly, verify your voltage before ordering, and budget for professional refrigerant connections — that discipline matters more than any single spec on the box.
