MRCOOL O-HH-24-HP-C-230C-O: certified ratings
Cooling 23,400–24,000 BTU/h · SEER2 up to 21 · HSPF2 up to 13.5 · up to 95% of 47°F heating capacity at 5°F · Cold climate: Yes
ENERGY STAR lists 3 certified indoor pairings for this outdoor unit. Series: O-HH Series. Refrigerant: R-454B. 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| O-24-HP-WMAH-230C-O | O-HH Series | 24,000 | 21 | 13 | 13.5 | 29,000 | 22,200 | 24,200 | 83% | 2.34 | Yes | R-454B (GWP:470 | Lower GWP) | 216032566 | 3798951 |
| DUCT-24HP-230B-O | O-HH Series | 24,000 | 19 | 12 | 11.7 | 26,000 | 21,600 | 24,000 | 92% | 2.18 | Yes | R-454B (GWP:470 | Lower GWP) | 216032568 | 3798953 |
| CASSETTE24HP-230C-O | O-HH Series | 23,400 | 20.7 | 12 | 11.6 | 25,000 | 20,400 | 23,800 | 95% | 2.23 | Yes | R-454B (GWP:470 | Lower GWP) | 216032567 | 3798952 |
"% 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 (24,000 BTU/h ÷ SEER2 21) | 1,143 | $209 |
| Heating (29,000 BTU/h ÷ HSPF2 13.5) | 2,148 | $393 |
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 |
|---|---|---|---|---|
| Senville SENE-24EL-OH | 25 | 11 | 83% | Yes |
| ACiQ ACIQ-24Z-E-HH-M3 | 22.5 | 10.25 | 95% | Yes |
| ACiQ SC-27Z-HH-M4B | 21 | 10 | 90% | Yes |
| Pioneer YN024GHFI25RPH | 21 | 10 | 76% | Yes |
| Pioneer YN024GLSI25RPH | 22.5 | 10 | 93% | Yes |
| ACiQ ACIQ-24Z-E-M3 | 21.75 | 9.75 | 83% | Yes |
| Pioneer YN024GMFI20RPD | 21.5 | 9.7 | 74% | Yes |
| ACiQ EZ-24ZPL-HP230B | 22.7 | 9.5 | 67% | No |
See MRCOOL 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.