Midea 37MAHAQ09AA3
Matched with the D5MAHAQ09XA3 indoor unit, this system is certified to the ENERGY STAR cold-climate criteria and publishes 12.50 HSPF2 and 27.50 SEER2, with 11,500 BTU/h of heating at 5°F.
Heating capacity of the Midea 37MAHAQ09AA3 at three outdoor temperatures, in BTU per hour. Paired with D5MAHAQ09XA3: 11,500 at 5°F, 12,000 at 17°F, 12,000 at 47°F. Paired with 45MCCAQ12XA3: 10,600 at 5°F, 9,000 at 17°F, 10,900 at 47°F. Paired with 45MBFAQ09XA3: 11,300 at 5°F, 9,800 at 17°F, 9,000 at 47°F. Paired with 45MBCAQ12XA3: 11,000 at 5°F, 9,700 at 17°F, 10,000 at 47°F. Paired with 45MBDAQ12XA3: 11,200 at 5°F, 9,600 at 17°F, 10,000 at 47°F.
- HSPF212.50Btu/Wh, seasonal heating
- SEER227.50Btu/Wh, seasonal cooling
- COP at 5°F1.80at that test point
- Capacity at 5°F11,500BTU/h
- Share of 47°F capacity95.8%ours: 5°F ÷ 47°F
What these numbers are and are not. SEER2, EER2, HSPF2 and the COP at 5°F are results from a standard rating procedure, measured at fixed temperatures and airflow in a laboratory. They are not predictions for your house, your climate or your winter. Two systems with the same HSPF2 can use different amounts of electricity in the same building, and the same system will perform differently in Boston and in Atlanta. Use the published capacity at 5°F to judge whether a system still produces heat on a cold night; use HSPF2 only to compare systems with each other.
Midea 37MAHAQ09AA3 published specifications
| Outdoor unit | 37MAHAQ09AA3 |
|---|---|
| Indoor unit | D5MAHAQ09XA3 (D5M Series) |
| Cold-climate certified | Yes |
| ENERGY STAR Most Efficient | Yes |
| SEER2 | 27.50 Btu/Wh |
| EER2 | 15.50 Btu/Wh |
| HSPF2 | 12.50 Btu/Wh |
| Cooling capacity | 9,000 BTU/h |
| Heating capacity at 47°F | 12,000 BTU/h |
| Heating capacity at 17°F | 12,000 BTU/h |
| Heating capacity at 5°F | 11,500 BTU/h |
| COP at 5°F | 1.80 |
| Compressor staging | Continuously variable |
| Refrigerant | R-454B |
| Date certified | 2026-05-06 |
| ENERGY STAR ID / AHRI reference | 3555768 / 215323787 |
| 5°F capacity as a share of 47°F (ours) | 95.8% |
| Capacity class (ours) | 9,000 BTU/h nominal |
Source. ENERGY STAR Certified Heat Pumps, U.S. EPA, retrieved 2026-10-16 from the dataset's Socrata API. Record identified by ENERGY STAR ID 3555768, AHRI reference 215323787. Certification partner: Carrier Corporation. Model numbers are reproduced exactly as published, including the asterisks ENERGY STAR carries as the manufacturer's wildcard for trim variants.
Every certified pairing for this outdoor unit
ENERGY STAR certifies an outdoor unit together with a specific indoor unit, and the ratings change with the head it is matched to. The dataset lists 5 pairings for the 37MAHAQ09AA3, so the figures above apply only to the pairing named beside them.
| Indoor unit | SEER2 | HSPF2 | Cooling BTU/h | 47°F | 17°F | 5°F | COP 5°F | Cold-climate |
|---|---|---|---|---|---|---|---|---|
| D5MAHAQ09XA3 | 27.50 | 12.50 | 9,000 | 12,000 | 12,000 | 11,500 | 1.80 | Yes |
| 45MCCAQ12XA3 | 24.00 | 12.20 | 9,000 | 10,900 | 9,000 | 10,600 | 1.83 | Yes |
| 45MBFAQ09XA3 | 27.30 | 10.90 | 9,000 | 9,000 | 9,800 | 11,300 | 1.84 | Yes |
| 45MBCAQ12XA3 | 22.70 | 12.20 | 9,000 | 10,000 | 9,700 | 11,000 | 1.84 | Yes |
| 45MBDAQ12XA3 | 21.50 | 12.50 | 9,000 | 10,000 | 9,600 | 11,200 | 1.89 | Yes |
What the published capacities say about cold weather
A heat pump moves heat from outdoor air, so the colder that air gets, the less heat there is to move. The dataset publishes capacity at three outdoor temperatures, and the shape between them is the single most useful thing on this page. For the 37MAHAQ09AA3 paired with the D5MAHAQ09XA3:
- At 47°F it delivers 12,000 BTU/h.
- At 17°F it delivers 12,000 BTU/h.
- At 5°F it delivers 11,500 BTU/h, which is 95.8% of the 47°F figure.
ENERGY STAR lists this system as meeting its cold-climate criteria, which the program describes as better low-temperature heating performance, suitable for use as a home's sole heating source. That is the program's judgement on the published test data, not a promise about any particular winter or any particular house.
Running cost for a 9,000 BTU/h system like this one
Worked as an illustration, not a quote: a house that burned 600 therms of gas in a year through an 80% AFUE furnace needed about 48.0 million BTU of delivered heat. At $1.50 a therm that gas cost $900. Delivering the same heat with a heat pump rated at 12.50 HSPF2 takes 3,840 kWh, which at $0.18 a kWh costs $691. The two costs are equal at $0.234 a kWh.
Those four prices are not your prices, and HSPF2 is a rating-condition figure rather than a seasonal measurement for your climate. Change every input in the running-cost calculator, which shows each formula as it works.
Comparable systems
Same nominal capacity class (9,000 BTU/h), closest published HSPF2 to this one. Colour marks cold-climate certification.
-
MDV MOX330-09HFN1-MY5W
Cold-climate
HSPF2 12.40 · SEER2 24.00 · 10,500 BTU/h at 5°F
-
CanAir C25SCH09H21
Cold-climate
HSPF2 12.30 · SEER2 25.50 · 7,500 BTU/h at 5°F
-
Fujitsu AOU9RLFF
Cold-climate
HSPF2 11.80 · SEER2 26.00 · 13,400 BTU/h at 5°F
-
Fujitsu AOU9RLFFH
Cold-climate
HSPF2 11.60 · SEER2 26.00 · 13,400 BTU/h at 5°F
-
LG KUSAL091A
Cold-climate
HSPF2 13.50 · SEER2 27.00 · 12,000 BTU/h at 5°F
More: all 92 certified systems, or the explainer on SEER2 vs HSPF2.