ACiQ Extreme Heat 24,000 BTU
#2 in 24,000 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.
The ACiQ Extreme Heat 24,000 BTU is the better mini-split overall, rated 4.6 to 4.0. The ACiQ Extreme Heat 24,000 BTU leads on efficiency and noise. The Della Optima Pro CloudAir 24,000 BTU 230V wins on cold weather.
Della Optima Pro CloudAir 24,000 BTU 230V
#7 in 24,000 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 $2,249.96 Della $2,249.96$2,249.96
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.
Which should you buy?
- Choose the ACiQ Extreme Heat 24,000 BTU for efficiency (13.5 HSPF2, 21 SEER2, COP 2.34 at 5 °F vs 10 HSPF2, 22.5 SEER2, COP 1.80 at 5 °F) and noise (indoor unit from 16 dB(A) vs indoor unit from 32 dB(A)).
- Choose the Della Optima Pro CloudAir 24,000 BTU 230V for cold weather (keeps 93% of its heat at 5 °F, heats down to -22 °F vs keeps 83% of its heat at 5 °F, heats down to -22 °F).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 24,000 BTU mini-split; a clear win is highlighted. How we rank explains each one.
| Factor weight | ACiQ Extreme Heat 24,000 BTU | Della Optima Pro CloudAir 24,000 BTU 230V |
|---|---|---|
| Overall rating | 4.6/5 | 4.0/5 |
| Cold weather 40% | 80 keeps 83% of its heat at 5 °F, heats down to -22 °F | 92 keeps 93% of its heat at 5 °F, heats down to -22 °F |
| Efficiency 30% | 85 13.5 HSPF2, 21 SEER2, COP 2.34 at 5 °F | 54 10 HSPF2, 22.5 SEER2, COP 1.80 at 5 °F |
| Warranty 20% | 100 12-year compressor, 7-year parts | 70 lifetime parts once registered, no compressor term stated |
| Noise 10% | 100 indoor unit from 16 dB(A) | 38 indoor unit from 32 dB(A) |
Specifications
| ACiQ Extreme Heat 24,000 BTU | Della Optima Pro CloudAir 24,000 BTU 230V | |
|---|---|---|
| Capacity (certified) | ||
| Size (nominal) | 24,000 BTU | 24,000 BTU |
| Cooling at 95 °F | 24,000 Btu/h | 24,000 Btu/h |
| Heating at 47 °F | 29,000 Btu/h | 24,000 Btu/h |
| Heating at 17 °F (max) | 23,200 Btu/h | 24,000 Btu/h |
| Heating at 5 °F (max) | 24,200 Btu/h | 22,400 Btu/h |
| Heat kept at 5 °F | 83% | 93% |
| Price per 1,000 Btu/h at 5 °F | - | $100 |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 13.5 | 10 |
| SEER2 | 21 | 22.5 |
| EER2 | 13 | 11.7 |
| COP at 5 °F | 2.34 | 1.80 |
| ENERGY STAR | ENERGY STAR Cold Climate | ENERGY STAR Cold Climate |
| AHRI certificate | 216032337 | 218471005 |
| Operating range | ||
| Heats down to | -22 °F | -22 °F |
| Cooling range | -22 to 122 °F | 5 to 131 °F |
| Installation | ||
| Installed by | Professional (sold through installers) | Sold for self-install (DIY) |
| Line set connection | Flare fittings (vacuum pump needed) | Flare fittings (vacuum pump needed) |
| Line set | up to 164 ft | 16.4 ft included, up to 65 ft |
| Voltage | 230 V | 230 V |
| Refrigerant | R-454B | R-454B |
| Indoor unit | ACIQ-24W-HH-MD | 048-TPH-24K2V-C-IN |
| Outdoor unit | ACIQ-24ZPL-HP230C | 048-TPH-24K2V-23S-OUT |
| Build | ||
| Indoor noise | 16–54.5 dB(A) | 32–49 dB(A) |
| Outdoor noise | 61.5 dB(A) | 61 dB(A) |
| Wi-Fi | Optional module | Built in |
| Room size (maker) | - | up to 1,500 sq ft |
| Weight | indoor 43.6 lb / outdoor 130.3 lb | indoor 30.9 lb / outdoor 108 lb |
| Warranty | 12 yr compressor, 7 yr parts | lifetime parts (registered) |
| Warranty with DIY install | No, a licensed installer is required | Yes |
| Released | - | 2026-05 |