9 Best Mini Split Air Conditioner and Heat Pump (November 2026)
The best mini split air conditioners and heat pumps include the Temprium 12000 BTU Mini Split Air Conditioner (best overall), the Rellytech Mini Split AC/Heating System 12000 BTU for cold winters, and the COSTWAY 12 for easy cleaning.
On this page (8 sections)
- Best mini split air conditioners and heat pumps by room size
- How these mini splits compare side by side
- What size mini split do you need for your room?
- Is 115V or 230V the right choice for your home?
- What efficiency rating actually saves you money?
- How quiet should a mini split be for a bedroom?
- Which smart features are worth paying for?
- The verdict on the best mini split air conditioner and heat pump
The best mini split air conditioner and heat pump for most homes is the Temprium 12000 BTU, because it pairs the highest efficiency here (22 SEER2) with 115V power and a 23 dB indoor unit. It cools and heats up to 750 sq ft, so it fits a large bedroom or living room without new electrical wiring.
Pick the Rellytech if your winters drop well below freezing, or the DELLA if you're conditioning a 1,500 sq ft open floor. For a small spare bedroom, the Rovsun 9000 BTU does the job for less.
This guide sorts the best mini split air conditioner and heat pump options by room size and voltage first, since those two numbers decide whether a unit suits your home. Then we look at efficiency, noise and controls.
If you want the core terminology first, read our guide to the mini split vs heat pump difference before you shop.
Our picks at a glance
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Best for cold wintersRellytech Mini Split AC/Heating System 12000 BTU
9.7/10 our score
See it on Amazon -
3
- 4
Check itDELLA Econo Series 23000 BTU 230V Mini
Best for large open rooms - 5
Check itMEPTY 12000BTU Mini Split AC/Heating System
Best for tight budgets - 6Check it
Temprium 24000 BTU Mini Split Air Conditioner
Best for whole-floor comfort - 7
Best for brand supportCheck it - 8
Check itNexaro 18000BTU Mini Split Air Conditioner
Best for medium rooms - 9
Best for small bedroomsCheck it
Best mini split air conditioners and heat pumps by room size
The strongest all-round pick for a typical bedroom or living room is the 12,000 BTU Temprium, while the bigger rooms and colder climates each have a better-suited option here. Start with floor area, then narrow by voltage and features.
Temprium 12000 BTU Mini Split Air Conditioner: Best overall
- 22 SEER2 efficiency
- 115V power
- 23 dB quiet operation
- WiFi app and voice control
The best balance of efficiency, quiet running and simple 115V installation for a bedroom or living room.
Pros
- 22 SEER2, the highest efficiency here
- Quietest indoor unit at 23 dB
- Works on standard 115V power
Cons
- 12,000 BTU only suits smaller rooms
- No smart scheduling without the app
The Temprium 12,000 BTU suits the most buyers because it does the everyday job well without demanding a special circuit. It runs on standard 115V power and cools up to 750 sq ft, which covers a large bedroom, a family room or a converted garage.
Its 22 SEER2 rating is the best efficiency in this group. The DC inverter compressor varies its speed instead of switching on and off, so it holds a steady temperature and uses less electricity in mild weather.
The R32 refrigerant has a global warming potential of 675. Heating runs down to 5°F.
Noise matters in a bedroom, and 23 dB in its quiet mode is close to a whisper. Seven modes and seven fan speeds, plus 4D auto swing, a Turbo setting and a Follow-Me function that tracks the remote, cover daily comfort.
WiFi control through the app or Alexa and Google Assistant means you can cool the room before you get home. A self-clean cycle at 133°F and a washable antibacterial filter cut the upkeep.
The trade-off is size: 12,000 BTU won't keep up in a big open-plan space. If that's your room, look at the DELLA or the larger Temprium below.
The indoor head measures 29.96 in wide and weighs 40.8 lb, so it fits most bedroom walls.
Rellytech Mini Split AC/Heating System 12000 BTU: Best for cold winters
- 20 SEER2 efficiency
- Operating range from -13°F to 122°F
- 8-year warranty
- WiFi app and voice control
The safest heating choice in this group, with the widest operating range and a longer warranty.
Pros
- Heats down to -13°F
- 20 SEER2 efficiency
- 8-year warranty coverage
Cons
- Louder than the Temprium at 28 dB
- Ships in two boxes that may arrive separately
The Rellytech 12000 BTU is the pick when winter is the hard part. Its working range runs from -13°F to 122°F, far wider than the 5°F heating floor on the Temprium, so it keeps producing heat in a northern cold snap when lesser units hand off to backup heat.
The 20 SEER2 rating sits just under the Temprium but still beats a standard 17 SEER2 unit by about 30% in the maker's efficiency comparison. It cools 750 sq ft and heats with 12,500 BTU, using R454B refrigerant and a high-power inverter compressor.
At 28 dB it stays quiet enough for a living room, just not as hushed as the top pick.
An 8-year warranty is the longest coverage in this group and worth real money on a system that lives outdoors. WiFi control, a 24-hour timer, turbo, sleep, eco and silent modes, iFeel and auto-defrost round out daily use.
The full kit includes two 16 ft copper pipes, a 19 ft connection cable, drain pipe and mounting hardware.
Two things to weigh: 28 dB is louder than the Temprium's 23 dB, and the system ships in two boxes that can arrive on different days. Plan installation after both land, since the outdoor unit can't run without the indoor head.
COSTWAY 12: Best for easy cleaning
- 21 SEER2 efficiency
- Self-cleaning at 135°F
- 4D airflow
- 13 ft copper line set included
A strong mid-range pick with the most thorough self-cleaning cycle in the group.
Pros
- Self-clean cycle at 135°F
- 21 SEER2 efficiency
- 5-year parts, 8-year compressor warranty
Cons
- Needs 208–230V wiring
- Remote only, with no WiFi control
The COSTWAY 12,000 BTU is the easy-maintenance choice. Its self-cleaning cycle runs at 135°F through condensation, frosting, melting, sterilization, washing and ventilation, which keeps the indoor coil drier between professional services.
The washable filters pull out for a rinse under the tap.
Efficiency is strong at 21 SEER2 with a 10 HSPF2 heating rating. It delivers 12,000 BTU of cooling and 12,300 BTU of heating across 750 sq ft, and the 4D airflow spreads air in four directions rather than one.
The outdoor unit is rated to work from 14°F to 122°F, so heating below 14°F isn't in its stated range.
The 5-year parts and 8-year compressor warranty matches the best coverage here. A 13 ft copper line set and communication wire come in the box, and the remote has a child lock and a 26 ft control range.
The catch is voltage: this model needs 208–230V wiring, so it won't plug into a standard outlet. It's also remote-only with no WiFi app.
If you already have a 230V circuit free, that's a fair trade for the cleaning cycle. The filters are manual-clean rather than the antibacterial type on the Temprium.
DELLA Econo Series 23000 BTU 230V Mini: Best for large open rooms
- 23,000 BTU cooling
- 17 SEER2 efficiency
- Covers up to 1,500 sq ft
- Smart sensor in the remote
The pick for a big open-plan space where a 12,000 BTU unit would run flat out all summer.
Pros
- Cools up to 1,500 sq ft
- Heats down to 5°F
- Remote senses room temperature
Cons
- 17 SEER2 is the lowest efficiency here
- Noise rises to 37 dB
The DELLA Econo 23,000 BTU is the answer for a big open-plan room. At 1.95 tons it cools up to 1,500 sq ft, so an open kitchen and living area gets one unit instead of two 12,000 BTU heads fighting each other.
Its 17 SEER2 rating is the lowest efficiency here, and that's the honest trade for the extra capacity. The DC inverter still saves up to 30% over a non-inverter unit.
Heating works down to 5°F with 22,400 BTU, so it covers winter in most climates. The temperature range runs 61°F to 88°F, with a maximum fuse size of 25A.
The smart sensor in the remote reads temperature where you're sitting rather than at the wall unit, which helps in a room with a hot sunny corner. 4D airflow, I Feel mode and a 24-hour timer are all included.
The app supports Alexa and WiFi on the 2.4 GHz band only. Noise reaches 37 dB, so it's better in a living area than a bedroom.
This unit needs 208–230V power and a licensed installer. Della says no refrigerant adjustment is needed under 25 ft of line.
Register within 100 days for lifetime parts coverage, with enhanced terms for licensed installs; labor isn't included.
MEPTY 12000BTU Mini Split AC/Heating System: Best for tight budgets
- 19 SEER2 efficiency
- 115V power
- 26 dB quiet mode
- Pre-charged R32 condenser
A low-cost 115V system for a spare room, with fast cooling and heating and simple remote control.
Pros
- Runs on standard 115V power
- 19 SEER2 efficiency
- Quick cool and heat modes
Cons
- Remote control only
- Quiet mode stops at 26 dB
The MEPTY 12000 BTU is the budget route into ductless cooling. It runs on 115V power and covers up to 750 sq ft, with 19 SEER2 efficiency and R32 refrigerant in a pre-charged condenser.
Speed is its selling point: MEPTY says the unit reaches a cool room in about 30 seconds and a heated room in about 60 seconds. Four fan speeds, up-and-down swing and a dehumidifying mode cover the daily modes you'd expect.
The temperature range runs 61°F to 88°F, matching the DELLA.
Noise drops to 26 dB in mute mode, which is quiet enough for a home office or a guest room. The self-clean function reduces moisture and odor between filter cleanings.
A 24-hour timer handles auto-off schedules.
The trade-offs are simple: remote control only, with no WiFi app or voice control. Quiet mode bottoms out at 26 dB, a few steps above the Temprium.
For a spare room where smart control doesn't matter, it's the value pick.
Temprium 24000 BTU Mini Split Air Conditioner: Best for whole-floor comfort
- 24,000 BTU cooling and heating
- 19 SEER2 efficiency
- Covers up to 1,500 sq ft
- WiFi app and voice control
The larger Temprium adds smart controls to a 2-ton system for a big living area or a whole floor.
Pros
- 24,000 BTU cooling and heating
- WiFi app and voice control
- Self-cleaning function
Cons
- Needs 208–230V wiring
- Louder than the 12,000 BTU version at 32 dB
The Temprium 24000 BTU takes the smart features of our top pick and scales them to a 2-ton system. It cools and heats up to 1,500 sq ft, making it the choice for a whole floor or a large great room where the 12,000 BTU model would run constantly.
Efficiency is 19 SEER2, lower than the 12,000 BTU version because bigger systems use more power by nature. It still runs the same DC inverter and R32 refrigerant.
Heating holds to 5°F and cooling works up to 119°F. At 2 tons it delivers 24,000 BTU in both directions.
WiFi control through the app or Alexa and Google Assistant, seven modes and a self-cleaning cycle at 133°F are all carried over. The indoor unit measures 42.87 in wide and 12.28 in deep, so check the wall space before you commit.
The air purification and antibacterial filters match the smaller model.
Noise reaches 32 dB, higher than the smaller model's 23 dB. And it needs 208–230V wiring.
For a big room, though, one quiet 2-ton head beats two smaller units, and the single outdoor unit means less hardware on the wall.
Senville LETO 12000 BTU: Best for brand support
- 12,000 BTU cooling
- Heats down to 5°F
- 16 ft line set included
- Alexa voice control
A well-known 115V system with Alexa control and a 5-year parts and compressor warranty.
Pros
- Alexa voice control
- 5-year parts and compressor warranty
- Pre-charged for up to 25 ft
Cons
- Covers less floor area at 700 sq ft
- No WiFi app control beyond Alexa
The Senville LETO 12000 BTU is the safe, known-name pick. Senville has sold this line for years, and the LETO bundles a 16 ft line set and communication wire, pre-charged for up to 25 ft, so the installer has fewer parts to source.
It cools 12,000 BTU across up to 700 sq ft and heats down to 5°F. Alexa voice control is built in, so you can set routines or change temperature by voice.
A 5-year parts and 5-year compressor warranty covers the main components. The unit also handles dehumidifying and fan-only running, plus turbo, in its four-in-one design.
The coverage is smaller than the Temprium's 750 sq ft, so measure your room first. Control is Alexa-based with no separate app for scheduling away from home.
And the warranty is shorter than the Rellytech's 8 years. The indoor unit is 26 in wide and weighs 80.7 lb as a set with the outdoor condenser.
If brand familiarity and installer-friendly packaging matter more than the last few square feet, this is a sensible buy. It's also a good fit for a business space like a store or small eatery.
Otherwise the Temprium wins on efficiency and coverage.
Nexaro 18000BTU Mini Split Air Conditioner: Best for medium rooms
- 18,000 BTU cooling
- R32 refrigerant
- Covers up to 1,250 sq ft
- Anti-mildew and self-defrost
A 1.5-ton system that fills the gap between the 12,000 and 24,000 BTU picks.
Pros
- Cools up to 1,250 sq ft
- Anti-mildew function
- Self-defrost for cold weather
Cons
- Remote control only
- Needs 208–230V wiring
The Nexaro 18000 BTU fills the size gap. At 1.5 tons it cools up to 1,250 sq ft, sitting neatly between the 12,000 and 24,000 BTU options for a medium living room or a large master suite.
It uses R32 refrigerant and offers five modes: cooling, heating, auto, fan and dry. Four fan speeds, a 24-hour timer, sleep, eco and turbo modes cover daily use.
An anti-mildew function helps keep the internal components clean, and self-defrost prevents ice buildup in cold weather. The washable filter pulls out for rinsing.
The heating capacity is only 12,500 BTU, tying the Rellytech's figure and less than you'd expect from the cooling rating, with no rated low-temperature floor in its stated range. Control is remote only.
It's rated for residential and commercial use, which widens its fit beyond the home.
For a mid-size room in a mild climate, the Nexaro is the sensible middle option. If winters bite, spend up on the Rellytech instead.
It also needs 208–230V wiring, so check your panel before ordering.
Rovsun 9000 BTU WiFi: Best for small bedrooms
- 9,000 BTU cooling
- 20 SEER2 efficiency
- WiFi and voice control
- Covers up to 450 sq ft
The smallest pick here, sized for a bedroom or home office rather than a living area.
Pros
- 20 SEER2 efficiency
- WiFi app and Alexa control
- Low 28 dB in mute mode
Cons
- Smallest capacity in this group
- Ships in two boxes
The Rovsun 9000 BTU is the smallest pick, sized for a bedroom, nursery or home office up to 450 sq ft. At 20 SEER2 it's efficient for its size, and WiFi plus Alexa and Google Assistant control let you set schedules from your phone.
It cools and heats across 61°F to 88°F and includes a dehumidifying mode for damp rooms. Noise drops to 28 dB in mute mode, and 4-way swing spreads air around the room.
Auto-defrost and a 24-hour timer are included, and the unit covers residential and light commercial spaces.
The clear limit is capacity: 9,000 BTU won't cool a living area, so this is a one-room unit. It also ships in two separate boxes.
Rovsun asks you to stand the unit upright for 24 hours before installation. The kit includes a 16.4 ft line set and signal cord, but you need to buy a power cord separately.
If you're cooling a single small room and want app control without paying for a bigger system, this is the fit. For anything larger, step up to the Temprium 12,000 BTU.
Note the voltage is 115V, so it runs on standard household power like the Temprium.
How these mini splits compare side by side
The table below lines up the picks by capacity, room size and voltage, the three numbers that decide whether a unit fits your home. Efficiency and noise follow once size is settled.
| Product | Best for | Capacity | Room size | Voltage | Our score |
|---|---|---|---|---|---|
| Temprium 12000 BTU Mini Split Air Conditioner | overall | 12,000 BTU cooling | Up to 750 sq ft | 115V | 9.7 |
| Rellytech Mini Split AC/Heating System 12000 BTU | cold winters | 12,000 BTU cooling | Up to 750 sq ft | 115V | 9.7 |
| COSTWAY 12 | easy cleaning | 12,000 BTU cooling | Up to 750 sq ft | 208–230V | 9.5 |
| DELLA Econo Series 23000 BTU 230V Mini | large open rooms | 23,000 BTU cooling | Up to 1,500 sq ft | 208–230V | 9.1 |
| MEPTY 12000BTU Mini Split AC/Heating System | tight budgets | 12,000 BTU cooling | Up to 750 sq ft | 115V | 9.0 |
| Temprium 24000 BTU Mini Split Air Conditioner | whole-floor comfort | 24,000 BTU cooling | Up to 1,500 sq ft | 208–230V | 8.9 |
| Senville LETO 12000 BTU | brand support | 12,000 BTU cooling | Up to 700 sq ft | 115V | 8.9 |
| Nexaro 18000BTU Mini Split Air Conditioner | medium rooms | 18,000 BTU cooling | Up to 1,250 sq ft | 208–230V | 8.4 |
| Rovsun 9000 BTU WiFi | small bedrooms | 9,000 BTU cooling | Up to 450 sq ft | 115V | 7.8 |
Our score weighs specs, features and buyer feedback against what you're shopping for. We ranked each unit by how well it matches a real room and voltage, then by efficiency, noise and controls.
We compared the published specifications for each model rather than testing any unit ourselves.
What size mini split do you need for your room?
Size by floor area first: about 9,000 BTU for 400 to 450 sq ft, 12,000 BTU for 550 to 750 sq ft, 18,000 BTU for 1,000 to 1,250 sq ft and 23,000 to 24,000 BTU for 1,500 sq ft. Getting this wrong is the most common and most expensive mistake with a mini split.
Sizing by room type
A standard bedroom of 150 to 250 sq ft is comfortably handled by 9,000 BTU. A primary bedroom or living room of 400 to 750 sq ft calls for 12,000 BTU.
Open-plan living areas and finished basements of 1,000 to 1,500 sq ft need 18,000 to 24,000 BTU.
When to size up
Add capacity for a room with a lot of south-facing glass, a vaulted ceiling, or an uninsulated garage wall. An oversized unit short-cycles and dehumidifies poorly, so size up one step at most.
A basement needs its own sizing logic; our guide to the mini split for basement spaces covers that in detail.
Is 115V or 230V the right choice for your home?
Choose 115V if your room is 750 sq ft or less and you want to avoid new electrical work. Choose 208–230V if you need 18,000 BTU or more, or if a dedicated circuit is already in place.
115V systems
The Temprium 12,000 BTU, Rellytech, MEPTY, Senville and Rovsun all run on standard 115V household power. They run on an existing outlet circuit, which keeps installation cost and time down.
These are the models most buyers should start with. A licensed installer still does the lines and vacuum work, so the saving is on the electrician's visit, not on labor overall.
208–230V systems
The COSTWAY, DELLA, larger Temprium and Nexaro need a 230V circuit. That means an electrician and a dedicated breaker, so factor that into the budget.
The DELLA calls for a maximum fuse size of 25A. The payoff is more capacity for bigger rooms.
If you're weighing a ducted system against this, read our comparison of the mini split heat pump vs forced air system first.
What efficiency rating actually saves you money?
Aim for at least 19 SEER2, and 22 SEER2 if you'll run the unit hard in summer. Each step up cuts power use per BTU, and the savings build over years of daily running.
SEER2 and HSPF2 explained
SEER2 measures cooling efficiency and HSPF2 measures heating efficiency. The Temprium leads at 22 SEER2, followed by COSTWAY at 21 with a 10 HSPF2 heating rating, then Rellytech and Rovsun at 20 and the larger Temprium and Nexaro in the high teens to 19, and DELLA at 17.
A 22 SEER2 unit uses noticeably less electricity than a 17 SEER2 model for the same cooling. An inverter compressor is what makes those ratings work in practice, since it slows down instead of cycling on and off.
When the rating matters most
In a hot climate with long cooling seasons, the efficiency gap pays back fastest. In a mild climate with a short summer, the difference is smaller and features like noise and controls matter more.
The 12,000 BTU range has plenty of efficient choices; our roundup of the 12000 btu mini split picks compares them head to head.
How quiet should a mini split be for a bedroom?
Pick a unit rated 26 dB or lower for a bedroom. The Temprium 12,000 BTU at 23 dB is the quietest here, followed by MEPTY at 26, Rellytech and Rovsun at 28, Temprium 24,000 at 32 and DELLA at 37 dB.
Quiet-mode ratings compared
Sound is measured in decibels on a logarithmic scale, so 23 dB is much quieter than 28 dB. A whisper sits around 30 dB.
The Temprium's 23 dB rating in its quiet mode makes it the clear bedroom pick, while the 37 dB DELLA suits a living area where conversation masks the compressor. MEPTY's 26 dB sits in between and costs less than the top pick.
Placement tips for quieter running
Mount the indoor head away from the head of the bed and avoid a wall shared with a bedroom. Keep the outdoor unit off a shared wall too, and set it on rubber pads to cut vibration.
The Rellytech kit includes four installation rubber pads for exactly this. Check that the outdoor unit has clearance for airflow on all sides.
Which smart features are worth paying for?
Pay for WiFi app control if you want to cool the room before you arrive, and for voice control if your home already runs Alexa or Google. Otherwise, a remote with a good timer covers most daily needs.
App and voice control
The Temprium pair, Rellytech and Rovsun support WiFi apps plus Alexa and Google Assistant. Senville works through Alexa.
COSTWAY, MEPTY and Nexaro are remote-only. App scheduling is the feature most people use daily, so it's worth the upgrade for a bedroom or home office.
Remember that the DELLA's WiFi runs on 2.4 GHz only, which some newer routers handle poorly.
Self-cleaning and air quality features
COSTWAY's 135°F self-clean cycle is the most thorough here, and Temprium's units run a 133°F cycle. MEPTY and Nexaro include self-clean or anti-mildew functions too.
These reduce manual coil cleaning but don't replace a seasonal filter rinse. For dust and pollen, look for units with an air purification or antibacterial filter, as the Temprium models have.
A washable dust filter, like the ones on the DELLA and Nexaro, is the minimum to expect.
The verdict on the best mini split air conditioner and heat pump
For most homes, the best mini split air conditioner and heat pump is the Temprium 12000 BTU. Its 22 SEER2 efficiency, 115V simplicity and 23 dB quiet running make it the easiest unit to live with in a bedroom or living room up to 750 sq ft.
Pick the Rellytech if your winters drop toward -13°F and you want the longest warranty. Pick the COSTWAY for its self-cleaning cycle on an existing 230V circuit.
Pick the DELLA or the Temprium 24,000 BTU for a 1,500 sq ft open floor, and the Rovsun 9000 BTU for a single small bedroom.
Whatever you choose, confirm the voltage against your panel and size the BTU to the room before you buy. Both checks save more money than any feature comparison.
Our top 3 picks at a glance
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Best for cold winters
Rellytech Mini Split AC/Heating System 12000 BTU
9.7/10 our score
See it on Amazon -
3
Frequently asked questions
Do mini split heat pumps work in freezing weather?
Yes, many do. The Rellytech heats down to -13°F and the Temprium, DELLA and Senville units heat to 5°F.
Below those limits the heat pump loses capacity and a backup heat source takes over, so compare your winter lows against the rated range.
Can I install a mini split myself?
No, every maker here calls for a licensed HVAC technician. The lines need vacuuming and the refrigerant charge has to be checked, and DIY installation usually voids the warranty.
Budget for professional labor on top of the unit.
What is the difference between a mini split and a heat pump?
A mini split is a ductless system with an indoor head and an outdoor unit. A heat pump is the reversible machinery inside it.
Our guide to the mini split vs heat pump difference explains how the two terms overlap.
Is 115V or 230V better for a mini split?
115V units run on standard household wiring and suit smaller rooms up to about 750 sq ft. 230V units need a dedicated circuit but deliver more capacity.
Pick by room size first, then confirm your electrical panel can support the model.
How much does it cost to run a mini split?
Efficiency rating drives running cost more than capacity. A 22 SEER2 unit uses less power per BTU than a 17 SEER2 model, so the higher-rated Temprium and COSTWAY units cost less to run in mild weather.
Local electric rates set the final number.
