Mitsubishi Hyper-Heat FX 18,000 BTU
#2 in 18,000 BTUFull review
Mitsubishi’s flagship cold-climate system: it makes more than its rated heat at 5 °F and keeps heating to −22 °F. For a home that relies on it as the main heat through a cold winter.
4.8/5
Senville’s top line makes more than its rated heat at 5 °F, heats to −22 °F and carries a 10-year parts and compressor warranty. Sold online, but the warranty needs a licensed installer.
- 18,000 BTUSize
- 22,600 Btu/hHeat at 5 °F
- 113%Kept at 5 °F
- 16.2 / 25.6HSPF2 / SEER2
- Pro installInstall
- $80Price / kBtu
Check price at Amazon$1,799.99Check price at Senville$1,799.99
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Makes 22,600 Btu/h at 5 °F, more than its rated 20,000 Btu/h
- Keeps heating down to −22 °F
- Among the most efficient here: HSPF2 16.2, SEER2 25.6
- 10-year parts and compressor warranty once registered
Cons
- 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 | 20,000 Btu/h |
| Heating at 17 °F (max) | 23,200 Btu/h |
| Heating at 5 °F (max) | 22,600 Btu/h |
| Heat kept at 5 °F | 113% |
| Price per 1,000 Btu/h at 5 °F | $80 |
| Efficiency (certified) | |
| HSPF2 (Region IV) | 16.2 |
| SEER2 | 25.6 |
| EER2 | 15 |
| COP at 5 °F | 2.34 |
| ENERGY STAR | ENERGY STAR Cold Climate |
| AHRI certificate | 217608151 |
| Operating range | |
| Heats down to | -22 °F |
| Installation | |
| Installed by | Professional (sold through installers) |
| Line set connection | Flare fittings (vacuum pump needed) |
| Line set | up to 98.4 ft |
| Voltage | 230 V |
| Refrigerant | R-454B |
| Indoor unit | SENE-18EL-IHH |
| Outdoor unit | SENE-18EL-OH |
| Build | |
| Indoor noise | 27–54.5 dB(A) |
| Outdoor noise | 57 dB(A) |
| Wi-Fi | Built in |
| Room size (maker) | up to 1,000 sq ft |
| Weight | indoor 43.6 lb / outdoor 130.3 lb |
| Warranty | 10 yr compressor, 10 yr parts |
| Warranty with DIY install | No, a licensed installer is required |
Alternatives in this size
ACiQ Extreme Heat 18,000 BTU
#3 in 18,000 BTUFull review
ACiQ’s cold-climate line, sold online, keeps most of its rated heat at 5 °F, heats to −22 °F and gets a 12-year compressor warranty once registered. A certified technician has to install it.
Fujitsu Orion XLTH 18,000 BTU
#4 in 18,000 BTUFull review
Fujitsu’s cold-climate line, with more than its rated heat at 5 °F and very high certified efficiency, for homes heating through a cold winter.
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