Daikin Atmosphera 24,000 BTU
#6 in 24,000 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.
The Daikin Atmosphera 24,000 BTU rates 4.1 among 24,000 BTU mini-splits; the Daikin Oterra 18,000 BTU rates 3.2 among 18,000 BTU ones.
Daikin Oterra 18,000 BTU
#19 in 18,000 BTUFull review
Daikin’s entry line, for cooling and mild winters: it stops heating below 5 °F, but keeps Daikin’s 12-year registered warranty.
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.
Scores side by side
These two sit in different size classes (24,000 BTU and 18,000 BTU), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Daikin Atmosphera 24,000 BTU | Daikin Oterra 18,000 BTU |
|---|---|---|
| Overall rating | 4.1/5 | 3.2/5 |
| Cold weather 40% | 87 keeps 100% of its heat at 5 °F, heats down to -13 °F | 24 keeps 70% of its heat at 5 °F, heats down to 5 °F |
| Efficiency 30% | 53 10 HSPF2, 22 SEER2, COP 1.80 at 5 °F | 50 9.6 HSPF2, 21 SEER2, COP 2.00 at 5 °F |
| Warranty 20% | 100 12-year compressor, 12-year parts | 100 12-year compressor, 12-year parts |
| Noise 10% | 29 indoor unit from 34 dB(A) | 33 indoor unit from 33 dB(A) |
Specifications
| Daikin Atmosphera 24,000 BTU | Daikin Oterra 18,000 BTU | |
|---|---|---|
| Capacity (certified) | ||
| Size (nominal) | 24,000 BTU | 18,000 BTU |
| Cooling at 95 °F | 21,600 Btu/h | 18,000 Btu/h |
| Heating at 47 °F | 24,000 Btu/h | 21,600 Btu/h |
| Heating at 17 °F (max) | 26,100 Btu/h | 19,500 Btu/h |
| Heating at 5 °F (max) | 24,000 Btu/h | 15,200 Btu/h |
| Heat kept at 5 °F | 100% | 70% |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 10 | 9.6 |
| SEER2 | 22 | 21 |
| EER2 | 12 | 12 |
| COP at 5 °F | 1.80 | 2.00 |
| ENERGY STAR | Not ENERGY STAR | ENERGY STAR Cold Climate |
| AHRI certificate | 212494260 | 217005314 |
| Operating range | ||
| Heats down to | -13 °F | 5 °F |
| Cooling range | 50 to 114.8 °F | 50 to 122 °F |
| Installation | ||
| Installed by | Professional (sold through installers) | Professional (sold through installers) |
| Line set connection | Flare fittings (vacuum pump needed) | Flare fittings (vacuum pump needed) |
| Line set | up to 98.5 ft | up to 99 ft |
| Voltage | 230 V | 230 V |
| Refrigerant | R-32 | R-32 |
| Indoor unit | FTXM24WVJU9 | FTXF18BVJU9 |
| Outdoor unit | RXM24WVJU9 | RXF18BVJU9 |
| Build | ||
| Indoor noise | 34–51 dB(A) | 33–48 dB(A) |
| Outdoor noise | 55 dB(A) | 54 dB(A) |
| Wi-Fi | Built in | Built in |
| Weight | indoor 33 lb / outdoor 132 lb | indoor 28 lb / outdoor 113 lb |
| Warranty | 12 yr compressor, 12 yr parts | 12 yr compressor, 12 yr parts |