MRCOOL MULTI3-27HP230B: certified ratings
Cooling 28,000 BTU/h · SEER2 up to 24.6 · HSPF2 up to 9.5 · up to 68% of 47°F heating capacity at 5°F · Cold climate: No
ENERGY STAR lists 1 certified indoor pairing for this outdoor unit. Series: MULTI. 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MULTI | 28,000 | 24.6 | 12.7 | 9.5 | 28,000 | 21,000 | 19,000 | 68% | 2 | No | R-410A (GWP:2088) | 208552834 | 2450670 |
"% 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 (28,000 BTU/h ÷ SEER2 24.6) | 1,138 | $208 |
| Heating (28,000 BTU/h ÷ HSPF2 9.5) | 2,947 | $540 |
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 |
|---|---|---|---|---|
| ACiQ ACIQ-27Z-HH-M3B | 23 | 10.6 | 89% | Yes |
| Senville SENA-28HF-MOB | 23 | 10.6 | 89% | Yes |
| ACiQ ACIQ-27Z-HH-M4C | 23 | 10.5 | 100% | Yes |
| Pioneer YN030GLSI24M3G | 24 | 10.5 | 71% | Yes |
| Senville SENA-28HF-MOA | 23 | 10.5 | 100% | Yes |
| ACiQ SC-30Z-HH-M4B | 21 | 10 | 76% | Yes |
| ACiQ ACIQ-30Z-E-M4 | 21.5 | 9.75 | 79% | Yes |
| ACiQ ES-27Z-M4C | 25 | 9.5 | 70% | 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.