Daikin Atmosphera 18,000 BTU
#8 in 18,000 BTUFull review
Holds its full rated heat at 5 °F, heats to −13 °F and carries Daikin’s 12-year registered warranty, among the longest here.
4.1/5
Fujitsu’s mainstream line for cooling and mild-winter heating, with a 10-year registered warranty. It stops heating below 5 °F.
- 18,000 BTUSize
- 18,500 Btu/hHeat at 5 °F
- 103%Kept at 5 °F
- 10.5 / 22HSPF2 / SEER2
- Pro installInstall
See it at Fujitsu
No store we check sells it online; the maker lists where to buy or who installs it.
Pros
- Makes 18,500 Btu/h at 5 °F, more than its rated 18,000 Btu/h
- 10-year parts and compressor warranty once registered
Cons
- Stops heating below 5 °F, so a cold winter needs backup heat
- Needs a licensed HVAC installer: a self-install voids the warranty
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Capacity (certified) | |
|---|---|
| Size (nominal) | 18,000 BTU |
| Cooling at 95 °F | 18,000 Btu/h |
| Heating at 47 °F | 18,000 Btu/h |
| Heating at 17 °F (max) | 21,700 Btu/h |
| Heating at 5 °F (max) | 18,500 Btu/h |
| Heat kept at 5 °F | 103% |
| Efficiency (certified) | |
| HSPF2 (Region IV) | 10.5 |
| SEER2 | 22 |
| EER2 | 12.5 |
| COP at 5 °F | 2.21 |
| ENERGY STAR | ENERGY STAR Cold Climate |
| AHRI certificate | 215441046 |
| Operating range | |
| Heats down to | 5 °F |
| Cooling range | 14 to 122 °F |
| Installation | |
| Installed by | Professional (sold through installers) |
| Line set connection | Flare fittings (vacuum pump needed) |
| Line set | up to 98 ft |
| Voltage | 230 V |
| Refrigerant | R-32 |
| Indoor unit | ASUH18KPAS |
| Outdoor unit | AOUH18KPAS1 |
| Build | |
| Indoor noise | 26–44 dB(A) |
| Outdoor noise | 50 dB(A) |
| Wi-Fi | Optional module |
| Weight | indoor 28 lb / outdoor 86 lb |
| Warranty | 10 yr compressor, 10 yr parts |
| Warranty with DIY install | No, a licensed installer is required |
Alternatives in this size
Della Optima Pro CloudAir 18,000 BTU 230V
#9 in 18,000 BTUFull review
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 $1,849.96 Della $1,849.96$1,849.96
MrCool DIY 5th Gen 18,000 BTU 230V
#11 in 18,000 BTUFull review
For someone who wants a true plug-together install with no tools beyond a drill, and a warranty that survives it. Expect to pay well over the price of a flare unit with the same cold-weather output.
Amazon MRCOOL DIY Direct $2,910$2,910
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