45 DIY mini-split heat pumps scored on price per unit of heat at 5 °F, cold-weather performance, efficiency and warranty.
A ductless mini-split is a heat pump in two parts: a wall unit inside and a compressor outside, joined by refrigerant lines through a 3-inch hole. It heats and cools one room or open area, and a modern one keeps heating well below freezing. The DIY kind comes with its refrigerant already sealed in. 25 of the 45 here use quick-connect line sets that screw together with no vacuum pump. The other 20 use flared line sets: still sold for self-install, but you need a vacuum pump and gauges, and some makers’ warranties ask for a licensed installer.
Every capacity and efficiency number here is an AHRI-certified rating, taken from the NEEP cold-climate heat pump list or ENERGY STAR, not from the box. Each size is ranked separately. Size by your coldest weather, not your summer: a unit that keeps all of its rated heat at 5 °F does a very different job in January than one that keeps 52%.
The best value for heating through a cold winter, if you can pull a vacuum yourself or pay someone to. It holds its full rated heat at 5 °F for far less than a quick-connect unit that does the same.
Amazon $1,249.96 Della $1,249.96A quick-connect unit with one of the longest warranties for a self-install, priced below MrCool’s DIY 5th Gen. Its −4 °F heating limit rules it out as the only heat in a very cold climate.
Amazon $1,981.829,000 BTU (3/4 ton): a bedroom, office or other room up to about 400 sq ft.
Top rated: Della Optima Pro CloudAir 9,000 BTU 230V $1,049.96
12,000 BTU (1 ton): a large bedroom, garage bay or open room up to about 550 sq ft.
Top rated: Della Optima Pro CloudAir 12,000 BTU 230V $1,249.96
18,000 BTU (1.5 tons): a living area, finished basement or two-car garage.
Top rated: Della Optima Pro CloudAir 18,000 BTU 230V $1,849.96
24,000 BTU (2 tons): an open-plan floor, a large shop or a small house.
Top rated: Della Optima Pro CloudAir 24,000 BTU 230V $2,249.96
36,000 BTU (3 tons): the largest single-zone DIY units, for big open spaces.
Top rated: Klimaire KIWQ-KOIQ DIY 5th Gen 36,000 BTU 230V $2,619
Prices were last checked October 21, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
The best value for heating through a cold winter, if you can pull a vacuum yourself or pay someone to. It holds its full rated heat at 5 °F for far less than a quick-connect unit that does the same.
Amazon $1,049.96 Della $1,049.96Full rated heat in deep cold at a fair price, for a self-installer comfortable with a vacuum pump. Della’s Optima Pro has near-identical certified ratings for a little less.
Amazon $1,311 Pioneer Mini Split store $1,318The cheapest way into a certified, cold-capable heat pump, for a self-installer with a vacuum pump. Pioneer’s Quantum Ultra and the quick-connect Klimaire DIY have near-identical certified ratings.
Amazon $879.96 Della $879.96The cheapest way into a certified, cold-capable heat pump, for a self-installer with a vacuum pump. Pioneer’s Quantum Ultra and the quick-connect Klimaire DIY have near-identical certified ratings.
Amazon $899.96 Della $899.96The best-value quick-connect line: the same certified system as Pioneer’s Quantum Ultra, close to Della’s Optima, without the vacuum pump, for the same price or a few hundred dollars more.
Amazon $1,099The best value for heating through a cold winter, if you can pull a vacuum yourself or pay someone to. It holds its full rated heat at 5 °F for far less than a quick-connect unit that does the same.
Amazon $1,249.96 Della $1,249.96Full rated heat in deep cold at a fair price, for a self-installer comfortable with a vacuum pump. Della’s Optima Pro has near-identical certified ratings for a little less.
Amazon $1,398 Pioneer Mini Split store $1,398The cheapest way into a certified, cold-capable heat pump, for a self-installer with a vacuum pump. Pioneer’s Quantum Ultra and the quick-connect Klimaire DIY have near-identical certified ratings.
Amazon $949.96 Della $949.96The cheapest way into a certified, cold-capable heat pump, for a self-installer with a vacuum pump. Pioneer’s Quantum Ultra and the quick-connect Klimaire DIY have near-identical certified ratings.
Amazon $969.96 Della $969.96A low price for a self-installer who owns or will rent a vacuum pump. The Klimaire DIY is the same certified system with quick-connect lines, and Della’s Optima has near-identical ratings for less.
Amazon Pioneer Mini Split store $1,148The best value for heating through a cold winter, if you can pull a vacuum yourself or pay someone to. It holds its full rated heat at 5 °F for far less than a quick-connect unit that does the same.
Amazon $1,849.96 Della $1,849.96Full rated heat in deep cold at a fair price, for a self-installer comfortable with a vacuum pump. Della’s Optima Pro has near-identical certified ratings for a little less.
Amazon $1,878 Pioneer Mini Split store $1,878A quick-connect unit with one of the longest warranties for a self-install, priced below MrCool’s DIY 5th Gen. Its −4 °F heating limit rules it out as the only heat in a very cold climate.
Amazon $1,981.82For cold-climate homes where a quick-connect install matters more than price: it holds its full heat far colder than other quick-connect units. Flare-connect units match its cold-weather output for much less.
Amazon $3,173 MRCOOL DIY Direct $3,205The cheapest way into a certified, cold-capable heat pump, for a self-installer with a vacuum pump. Pioneer’s Quantum Ultra and the quick-connect Klimaire DIY have near-identical certified ratings.
Amazon $1,319.96 Della $1,499.96The best value for heating through a cold winter, if you can pull a vacuum yourself or pay someone to. It holds its full rated heat at 5 °F for far less than a quick-connect unit that does the same.
Amazon $2,249.96 Della $2,249.96Full rated heat in deep cold at a fair price, for a self-installer comfortable with a vacuum pump. Della’s Optima Pro has near-identical certified ratings for a little less.
Amazon $2,298 Pioneer Mini Split store $2,323A quick-connect unit with one of the longest warranties for a self-install, priced below MrCool’s DIY 5th Gen. Its −4 °F heating limit rules it out as the only heat in a very cold climate.
Amazon $2,025.45The cheapest way into a certified, cold-capable heat pump, for a self-installer with a vacuum pump. Pioneer’s Quantum Ultra and the quick-connect Klimaire DIY have near-identical certified ratings.
Amazon $1,849.96 Della $1,849.96The best-value quick-connect line: the same certified system as Pioneer’s Quantum Ultra, close to Della’s Optima, without the vacuum pump, for the same price or a few hundred dollars more.
Amazon $1,869The best-value quick-connect line: the same certified system as Pioneer’s Quantum Ultra, close to Della’s Optima, without the vacuum pump, for the same price or a few hundred dollars more.
Amazon $2,619The pricier of the two 36,000 BTU quick-connect units, with a better heating limit and quieter indoor unit than the Klimaire. Neither keeps much of its heat in deep cold.
Amazon $3,569.99 MRCOOL DIY Direct $3,790Each mini-split is scored on what it costs per unit of heat at 5 °F, how much of its heat it keeps in the cold and how low it keeps heating, its certified efficiency, its warranty and how quiet the indoor unit is.
| Factor | Measures | Weight |
|---|---|---|
| Value | price per Btu/h of heat at 5 °F | 35% |
| Cold weather | heat kept at 5 °F, lowest heating temperature | 25% |
| Efficiency | HSPF2, SEER2, COP at 5 °F | 20% |
| Warranty | compressor and parts cover, DIY install allowed | 15% |
| Noise | quietest indoor fan setting | 5% |
How we rank explains each factor in full.
