Best picks right now
Best 12,000 BTU mini-split
12,000 BTU mini-split · AIRSTAGE H-Series · cold-climate certified
- SEER2
- 31.5
- HSPF2
- 13.7
- Heat at 5°F
- 16,200
Highest cooling efficiency in the most popular single-room size, and the leader for cold winters too.
Full specs and running costBest 3-ton central heat pump
3 ton central · cold-climate certified
- SEER2
- 29.7
- HSPF2
- 12.2
- Heat at 5°F
- 28,200
The most efficient ducted system in the most common whole-house size.
Full specs and running costBest 10,000 BTU window air conditioner
9,500 BTU · saddle · heats too
- CEER
- 17.6
- Power draw
- 540 W
- Per year
- $73
The most efficient unit for a large bedroom or small living room, about 400-450 sq ft.
Specs, size and running costAll best picks: by size, climate and room
Browse by size
- 6,000 BTU 24
- 9,000 BTU 269
- 12,000 BTU 275
- 15,000 BTU 57
- 18,000 BTU 314
- 24,000 BTU 320
- 30,000 BTU 108
- 36,000 BTU 135
- 42,000 BTU 50
- 48,000 BTU 91
- 60,000 BTU 32
Not sure? Heat pump sizing by square footage · Window AC size calculator · Portable AC size calculator
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Climate, energy prices and the models that cost least to run, for 272 U.S. cities.
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The ratings in one minute
- SEER2 · cooling over a summerhigher is better
- EER2 · cooling on a 95°F dayhigher is better
- HSPF2 · heating over a winterhigher is better
- Heat and COP at 5°F · performance in deep coldmatters if winters are cold
The federal minimum for a split heat pump is 14.3 SEER2 and 7.5 HSPF2. More on each rating