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 3.8. The ACiQ Extreme Heat 24,000 BTU leads on warranty, efficiency and noise. The Pioneer Quantum Hyperformance 24,000 BTU 230V wins on cold weather.
Pioneer Quantum Hyperformance 24,000 BTU 230V
#8 in 24,000 BTUFull review
Full rated heat in deep cold at a fair price, for a self-installer comfortable with a vacuum pump. Della’s Optima Pro has near-identical certified ratings for a little less.
Amazon $2,298 Pioneer Mini Split store $2,323$2,298
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 warranty (12-year compressor, 7-year parts vs 5-year compressor, 5-year parts, for a DIY install), 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 Pioneer Quantum Hyperformance 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 | Pioneer Quantum Hyperformance 24,000 BTU 230V |
|---|---|---|
| Overall rating | 4.6/5 | 3.8/5 |
| 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 | 49 5-year compressor, 5-year parts, for a DIY install |
| Noise 10% | 100 indoor unit from 16 dB(A) | 38 indoor unit from 32 dB(A) |
Specifications
| ACiQ Extreme Heat 24,000 BTU | Pioneer Quantum Hyperformance 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 | - | $103 |
| 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 | 217048757 |
| 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 ft included, up to 65 ft |
| Voltage | 230 V | 230 V |
| Refrigerant | R-454B | R-454B |
| Indoor unit | ACIQ-24W-HH-MD | WT024GLSI25HLH |
| Outdoor unit | ACIQ-24ZPL-HP230C | YN024GLSI25RPH |
| 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 1,000 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 | 10 yr compressor, 7 yr parts |
| Warranty with DIY install | No, a licensed installer is required | Yes |
| DIY install warranty | - | 5 yr compressor, 5 yr parts |
| Released | - | 2025-06 |