MRCOOL O-HH-12-HP-C-230C-O: certified ratings
Cooling 12,000 BTU/h · SEER2 up to 25.4 · HSPF2 up to 11.6 · up to 96% 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CASSETTE12HP-230C-O | O-HH Series | 12,000 | 22.2 | 12.5 | 11.6 | 12,000 | 10,000 | 11,500 | 96% | 2 | Yes | R-454B (GWP:470 | Lower GWP) | 216032561 | 3798946 |
| O-12-HP-WMAH-230C-O | O-HH Series | 12,000 | 25.4 | 13.4 | 10.5 | 12,000 | 12,000 | 11,500 | 96% | 1.8 | Yes | R-454B (GWP:470 | Lower GWP) | 216032560 | 3798945 |
| DUCT-12HP-230B-O | O-HH Series | 12,000 | 20 | 12 | 10 | 12,500 | 9,600 | 11,800 | 94% | 1.9 | Yes | R-454B (GWP:470 | Lower GWP) | 216032562 | 3798947 |
"% 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 (12,000 BTU/h ÷ SEER2 22.2) | 541 | $99 |
| Heating (12,000 BTU/h ÷ HSPF2 11.6) | 1,034 | $189 |
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-12EL-OH | 29.4 | 12.7 | 112% | Yes |
| Pioneer YN012GMSI24RPG | 24.6 | 11 | 74% | Yes |
| Pioneer YN012GLSI25RPH | 25 | 10.5 | 100% | Yes |
| ACiQ ACIQ-12ZS-HP115C | 23.2 | 10.4 | 61% | No |
| ACiQ EZ-12ZPL-HP115B | 23.5 | 10.2 | 70% | Yes |
| Pioneer YN012ALSI24RPG | 23 | 10 | 72% | Yes |
| Pioneer YN012AMFI22RPE | 22.7 | 10 | 54% | No |
| Pioneer YN012GLSI24RPG | 24 | 10 | 75% | Yes |
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.