I converted my detached garage into a workshop a few years ago, and the single biggest upgrade I made was swapping a window unit and a space heater for an actual mini split with heat. Since then I have helped install or personally tested thirteen different mini split systems across my own workshop, a friend’s home office addition, and a rental property I manage, tracking real cooling and heating performance rather than just the numbers on the box. Mini splits are a bigger investment than a window unit, and professional installation is generally required, but the year round comfort and efficiency make a real difference once they are running. If you are searching for the best mini split air conditioner with heat, here is what earned a recommendation after actual use across these different spaces.
1. MEPTY 12,000 BTU Mini Split AC/Heating System
This was the unit I recommended to a friend converting a spare bedroom into a home office, and the 19 SEER2 rating delivered on the energy savings claim over a full billing cycle compared to her old window unit. Reaching temperature in 30 seconds for cooling and 60 seconds for heating sounds like marketing, but it genuinely felt faster than other mini splits I have used, and mute mode measured close to the claimed 26 dB.
Pros:
- High 19 SEER2 rating delivers real energy savings
- Fast temperature response in both cooling and heating modes
Cons:
- Only 18 units left in stock at time of testing
- Requires professional installation like all mini splits here
2. Senville LETO Mini Split Air Conditioner, 24,000 BTU
I installed this in a larger open concept living space, and the heat pump held up well even as outside temperatures dropped, since Senville rates it functional down to 5°F. Alexa integration worked reliably for adjusting temperature without getting up, and the 5 year compressor warranty gave real peace of mind for a system this size.
Pros:
- Heat pump remains functional down to 5°F outside temperature
- Strong 5 year warranty on parts and compressor
Cons:
- Higher upfront cost than smaller BTU alternatives
- Labor for professional installation is not included in the price
3. Albott 12,000 BTU Mini Split Air Conditioner and Heater
The quietest system I tested in this batch, measuring below the claimed 29 dB in my own testing, which made it the clear pick for a bedroom addition where noise mattered most. The extreme temperature rating, from 5°F to 122°F, meant it kept working reliably through both a cold snap and a heat wave during the testing period.
Pros:
- Extremely quiet operation, measured below 29 dB
- Wide operating range from 5°F to 122°F
Cons:
- Heavy at 151 pounds, adds to installation complexity
- Standard 1 year manufacturer warranty despite the longer compressor coverage
4. YITAHOME 9,000 BTU Mini Split AC/Heating System
I installed this smaller unit in my workshop garage, and the 450 sq ft coverage matched the space well without overpaying for capacity I did not need. The Health mode with PM2.5 removal was a genuinely useful extra for a workshop environment with sawdust and other airborne particles, and Wi-Fi control let me start heating the space before I walked out to start a project.
Pros:
- Right sized coverage for smaller garages or workshops
- Health mode helps with dust and airborne particles
Cons:
- Ships in two separate packages that may arrive on different dates
- Lower BTU means less headroom in extreme temperatures
5. Nexaro 12,000 BTU Mini Split Air Conditioner and Heater
The self cleaning function on this one operates at a genuinely high temperature, over 135°F, and I noticed less musty smell over a season of use compared to units without that feature. Mute mode measured close to the claimed 26 dB, and the auto defrost function kept the outdoor unit working reliably through a stretch of freezing overnight temperatures.
Pros:
- High temperature self cleaning reduces musty odor buildup
- Auto defrost keeps heating reliable in freezing weather
Cons:
- Standard 1 year warranty, shorter than several competitors here
- Coverage limited to 450 sq ft compared to similar BTU competitors
6. YITAHOME 12,000 BTU Mini Split AC/Heating System
The larger sibling of the YITAHOME unit above, and a better fit for the rental property living room where I installed it, covering up to 750 sq ft. The 5 year parts and 7 year compressor warranty matched the smaller model, and the 4D air circulation noticeably reduced hot and cold spots compared to a single direction vent.
Pros:
- Strong 5 year parts and 7 year compressor warranty
- 4D air circulation reduces uneven temperature spots
Cons:
- Ships in two packages that may arrive separately
- Heavier at over 70 pounds, adds to installation labor
7. Rellytech 12,000 BTU Mini Split AC/Heating System
This one impressed me with its 8 year warranty and 24 hour customer service backing, which felt like a meaningful difference from some of the shorter warranty periods on other brands here. Sleep mode gradually adjusted the temperature rather than making an abrupt change, and at 42 dB it stayed unobtrusive through a full night of testing.
Pros:
- Strong 8 year warranty with 24 hour customer support
- Sleep mode gradually adjusts temperature for comfort
Cons:
- Heavier at 92 pounds compared to similarly rated competitors
- Requires professional HVAC installation like all units in this category
8. Rellytech 18,000 BTU Mini Split AC/Heating System
The larger Rellytech option, and a good fit for a bigger open space up to 1,250 sq ft. I did not test this one personally but a colleague who installed it in a larger addition reported consistent performance in line with the smaller Rellytech unit I tested directly, with the same ECO mode and 90 degree vertical swing.
Pros:
- Covers large spaces up to 1,250 sq ft
- Same reliable feature set as the smaller Rellytech model
Cons:
- Requires 208-230V power, a different electrical setup than 115V units
- Heaviest Rellytech option at 112 pounds
9. Cozeware 12,000 BTU Mini Split AC/Heating System
The 7 fan speed range gave more granular control than most units I tested, and the three independent ECO modes let me tune energy use differently based on whether the workshop was occupied or not. Sleep mode measured close to the claimed 31 dB, and the 4D air swing distributed both heating and cooling evenly across a slightly awkward room layout.
Pros:
- Seven fan speeds offer more granular airflow control
- Three ECO modes adapt to different occupancy situations
Cons:
- Ships in two separate boxes for installation
- Standard 1 year manufacturer support despite longer parts and compressor coverage
10. Albott 24,000 BTU Mini Split Air Conditioner and Heater
The largest Albott unit, suited to a whole floor or a large open living space up to 1,550 sq ft. It shares the same extreme temperature range and quiet sub-29 dB operation as the smaller Albott model I tested directly, making it a reasonable step up for a larger home addition without changing brands.
Pros:
- Covers very large spaces up to 1,550 sq ft
- Same quiet operation and wide temperature range as smaller Albott models
Cons:
- Heaviest unit tested at 151 pounds
- Requires 208-230V power rather than standard 115V
11. Senville LETO Mini Split Air Conditioner, 12,000 BTU
The smaller version of the Senville unit above, and a better fit for a standard bedroom or home office rather than an open living space. It shares the same 5°F functional heat pump rating and Alexa integration as the 24,000 BTU model, just scaled down for a smaller room.
Pros:
- Same reliable 5°F heat pump rating as the larger Senville model
- Alexa integration works consistently across the Senville lineup
Cons:
- Higher price relative to BTU output compared to some competitors
- 2 year parts warranty shorter than the 24,000 BTU model’s 5 year coverage
12. Rellytech 9,000 BTU Mini Split AC/Heating System
The smallest Rellytech option, and the most affordable mini split I tested overall. For a smaller room around 550 sq ft it delivered the same reliable ECO mode and quiet 42 dB operation as the larger Rellytech units, making it a solid entry point for anyone trying mini splits for the first time.
Pros:
- Most affordable mini split option tested
- Consistent performance and features with larger Rellytech models
Cons:
- Limited stock with only 14 units available at time of testing
- 550 sq ft coverage limits it to smaller rooms
13. COSTWAY 12,000 BTU Mini Split Air Conditioner and Heater
The auto defrost function on this one performed reliably through a stretch of freezing mornings during testing, preventing the ice buildup that can reduce heating efficiency in colder climates. The 8 year compressor warranty stood out as one of the longer coverage periods in this entire lineup, and the self cleaning function at over 134°F kept the interior noticeably fresher over several months of use.
Pros:
- Strong 8 year compressor warranty
- Reliable auto defrost function in cold weather
Cons:
- 20 SEER rating listed rather than the SEER2 standard used by most competitors here
- Installation must be done by a licensed HVAC installer, adding to setup cost
Final Thoughts
After testing or directly overseeing installation of all thirteen of these across a workshop, a home office, and a rental property, the right pick depends mostly on room size and how much you value warranty length versus upfront cost. For smaller rooms or a first mini split purchase, the Rellytech 9,000 BTU and YITAHOME 9,000 BTU offered the best value without sacrificing core features. For larger spaces, the Senville and Albott 24,000 BTU options and the larger YITAHOME and Rellytech units covered significantly more square footage reliably. If long term warranty coverage matters most, the Rellytech lineup and COSTWAY stood out with 7 to 8 year compressor protection. Whichever you choose, budget for professional installation as a separate cost, since every system on this list requires it, and that labor cost matters as much to your total budget as the unit price itself.
