Daikin Oterra 24,000 BTU
#16 in 24,000 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.
2.9/5
Senville’s budget line, for cooling and mild winters: it stops heating below 5 °F, and the 5-year warranty needs a licensed installer.
- 24,000 BTUSize
- 17,000 Btu/hHeat at 5 °F
- 71%Kept at 5 °F
- 9.3 / 18.7HSPF2 / SEER2
- Pro installInstall
- $74Price / kBtu
Check price at Senville$1,249.99
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Line set can run up to 164 ft, so the outdoor unit can sit well away from the room
- Built-in Wi-Fi for control from a phone app
Cons
- Stops heating below 5 °F, so a cold winter needs backup heat
- Warranty is 5 years on parts and compressor, shorter than most here
- 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) | 24,000 BTU |
| Cooling at 95 °F | 24,000 Btu/h |
| Heating at 47 °F | 24,000 Btu/h |
| Heating at 17 °F (max) | 20,800 Btu/h |
| Heating at 5 °F (max) | 17,000 Btu/h |
| Heat kept at 5 °F | 71% |
| Price per 1,000 Btu/h at 5 °F | $74 |
| Efficiency (certified) | |
| HSPF2 (Region IV) | 9.3 |
| SEER2 | 18.7 |
| EER2 | 10 |
| COP at 5 °F | 2.14 |
| ENERGY STAR | ENERGY STAR Cold Climate |
| AHRI certificate | 215735291 |
| Operating range | |
| Heats down to | 5 °F |
| Installation | |
| Installed by | Professional (sold through installers) |
| Line set connection | Flare fittings (vacuum pump needed) |
| Line set | up to 164 ft |
| Voltage | 230 V |
| Refrigerant | R-454B |
| Indoor unit | SENL-24CD-ILL |
| Outdoor unit | SENL-24CD-OL |
| Build | |
| Indoor noise | 27–54 dB(A) |
| Outdoor noise | 59.5 dB(A) |
| Wi-Fi | Built in |
| Room size (maker) | up to 1,250 sq ft |
| Weight | indoor 30.6 lb / outdoor 94.6 lb |
| Warranty | 5 yr compressor, 5 yr parts |
| Warranty with DIY install | No, a licensed installer is required |
Alternatives in this size
MrCool DIY Easy Pro 24,000 BTU 230V
#17 in 24,000 BTUFull review
A middle step between MrCool’s Select and DIY 5th Gen: quick-connect and a fair warranty, but it loses much of its heat in a cold snap. Best for mild winters.
MRCOOL DIY Direct $2,109$2,109
MrCool DIY Select 24,000 BTU 230V
#18 in 24,000 BTUFull review
For mild climates and occasional use, where a low price for a quick-connect unit matters most. The short warranty and weak cold-weather output make it a poor main heat source.
Amazon $1,899 MRCOOL DIY Direct $1,899$1,899
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