ACiQ SC-27Z-HH-M4B: certified ratings
Cooling 23,200 BTU/h · SEER2 up to 21 · HSPF2 up to 10 · up to 90% of 47°F heating capacity at 5°F · Cold climate: Yes
ENERGY STAR lists 1 certified indoor pairing for this outdoor unit. Series: Extreme Heat. Refrigerant: R-410A. Compressor: continuously variable (inverter), per ENERGY STAR.
All certified pairings (highest HSPF2 first)
| Indoor unit | Series | Cooling BTU/h | SEER2 | EER2 | HSPF2 | Heat 47°F | Heat 17°F | Heat 5°F | % of 47°F cap. at 5°F | COP 5°F | Cold climate | Refrigerant | AHRI ref. | ENERGY STAR record |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Extreme Heat | 23,200 | 21 | 12.5 | 10 | 24,000 | 23,600 | 21,600 | 90% | 2.1 | Yes | R-410A (GWP:2088) | 215742357 | 3630160 |
"% of 47°F capacity at 5°F" = heating capacity at 5°F ÷ heating capacity at 47°F, both from the ENERGY STAR record (ENERGY STAR's cold-climate designation requires ≥70% and COP ≥1.75 at 5°F; criteria).
Rough running-cost yardstick (top-rated pairing)
| kWh per 1,000 full-load hours | Cost at U.S. avg rate | |
|---|---|---|
| Cooling (23,200 BTU/h ÷ SEER2 21) | 1,105 | $202 |
| Heating (24,000 BTU/h ÷ HSPF2 10) | 2,400 | $439 |
Cost estimates: cooling kWh ≈ cooling capacity × full-load hours ÷ SEER2 ÷ 1,000; heating kWh ≈ 47°F heating capacity × full-load hours ÷ HSPF2 ÷ 1,000. "Per 1,000 full-load hours" is a yardstick for comparing systems, not a prediction of your bill; your hours depend on climate, house and settings. Rate: U.S. average residential 18.31¢/kWh (EIA, July 2026 (preliminary)).
Estimate with your own hours and rate · Compare with another system
Similar-capacity single-zone units from other DIY brands
| Outdoor unit | Best SEER2 | Best HSPF2 | Best % cap. at 5°F | Cold climate |
|---|---|---|---|---|
| MRCOOL O-ES-24-HP-C-230C-O1 | 21 | 13.5 | 83% | Yes |
| MRCOOL O-HH-24-HP-C-230C-O | 21 | 13.5 | 95% | Yes |
| MRCOOL O-HH-24-HP-C-230A | 21.5 | 11.4 | 86% | Yes |
| MRCOOL O-HH-24-HP-C-230B | 21.5 | 11.4 | 86% | Yes |
| Senville SENE-24EL-OH | 25 | 11 | 83% | Yes |
| MRCOOL AEPL**MHV22S2431B1A | 23 | 10 | 73% | Yes |
| MRCOOL O-ES-24-HP-C-230B | 22 | 10 | 62% | No |
| Pioneer YN024GHFI25RPH | 21 | 10 | 76% | Yes |
See ACiQ on the manufacturer's site (plain link, not an affiliate link)
We have not tested or installed this equipment. Data gaps: price, sound level, line-set length, warranty and installation requirements are not in ENERGY STAR data. Confirm the AHRI reference number on your quote matches a certified pairing.