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.
4.5/5
A cold-climate unit sold online by Senville that keeps most of its rated heat at 5 °F and heats to −22 °F. Parts cover is 5 years, half the compressor’s 10.
- 18,000 BTUSize
- 18,000 Btu/hHeat at 5 °F
- 100%Kept at 5 °F
- 11 / 21.4HSPF2 / SEER2
- Pro installInstall
- $89Price / kBtu
Check price at Senville$1,599.99
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Keeps 100% of its rated heat at 5 °F: 18,000 Btu/h
- Keeps heating down to −22 °F
- 10-year compressor warranty once registered (5 years on parts)
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 | 18,000 Btu/h |
| Heating at 17 °F (max) | 19,200 Btu/h |
| Heating at 5 °F (max) | 18,000 Btu/h |
| Heat kept at 5 °F | 100% |
| Price per 1,000 Btu/h at 5 °F | $89 |
| Efficiency (certified) | |
| HSPF2 (Region IV) | 11 |
| SEER2 | 21.4 |
| EER2 | 12.5 |
| COP at 5 °F | 1.92 |
| ENERGY STAR | ENERGY STAR Cold Climate |
| AHRI certificate | 215735297 |
| 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 | SENA-18HF-IGG |
| Outdoor unit | SENA-18HF-OG |
| Build | |
| Indoor noise | 27–49 dB(A) |
| Outdoor noise | 59 dB(A) |
| Wi-Fi | Built in |
| Room size (maker) | up to 1,000 sq ft |
| Weight | indoor 33.5 lb / outdoor 101.4 lb |
| Warranty | 10 yr compressor, 5 yr parts |
| Warranty with DIY install | No, a licensed installer is required |
Alternatives in this size
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.
MrCool DIY Hyper Heat 5th Gen 18,000 BTU 230V
#6 in 18,000 BTUFull review
For cold-climate homes where a quick-connect install matters more than price: it holds its full heat far colder than other quick-connect units. Flare-connect units match its cold-weather output for much less.
Amazon $3,173 MRCOOL DIY Direct $3,205$3,173
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