What is the SEER2 rating of the Carrier 37MUHAQ30AA3?

The Carrier 37MUHAQ30AA3 is rated at up to 17.5 SEER2 and 11.7 EER2 for cooling and up to 10.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 35 certified matchups SEER2 ranges from 15.3-17.5.

Is the Carrier 37MUHAQ30AA3 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 33,200 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.

How much does the Carrier 37MUHAQ30AA3 cost to run per year?

At its rated efficiency it costs about $783-$1,926 a year in electricity in large U.S. cities, depending on climate and local rates - for example $958 in Phoenix and $1,586 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Which indoor units work with the Carrier 37MUHAQ30AA3?

ENERGY STAR lists 35 certified combinations for this outdoor unit. The highest-rated ones use D5MUWAQ30XA3, 45MUHAQ36XX3, D5FUHAH36XAK.

2.5-ton central heat pump · 45M Series

Carrier 37MUHAQ30AA3

Average cooling efficiency and excellent heating efficiency for a 2.5-ton central heat pump, and certified for cold climates.

Ranks #60 of 199 2.5 ton central heat pumps for cooling efficiency, and costs about $827 a year to run in a mixed climate like Atlanta.

SEER2: 17.5 Cooling efficiency over a season
Average · beats 58%
HSPF2: 10.8 Heating efficiency over a season
Excellent · beats 98%
EER2: 11.7 Cooling efficiency on a 95°F day
Average · beats 43%
Heat at 5°F: 33,200 BTU/h100% of its 47°F output
Below average · beats 39%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 33,200 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 98% of central heat pumps.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 35 certified pairings.

Think twice if…

Nothing stands out - its ratings have no weak spot for its class.

Calculate my running cost

Details

Specifications2.5 ton, R-454B

General
Brand	Carrier
Also sold as	Bryant, Payne, WeatherMaker, Midea
Outdoor unit model	37MUHAQ30AA3
Series	45M Series
Type	Central heat pump
Nominal size	2.5 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	November 15, 2018
Last certified	March 26, 2026
Cooling
SEER2Seasonal efficiency, higher is better	17.5 (range 15.3-17.5)
EER2Efficiency at 95°F outdoors	10.0-12.1
Cooling capacity	29,000-30,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.3-10.8
Capacity at 47°F	30,000-34,000 BTU/h
Capacity at 17°F	23,200-25,000 BTU/h
Capacity at 5°F	30,400-33,200 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80-2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder100% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with D5MUWAQ30XA3 at the standard test temperatures, in BTU/h:

Certified matchups35 indoor units

The same outdoor unit scores differently with each indoor unit. Ask your installer for the AHRI reference number of the exact system you are quoted.

Indoor unit	SEER2	EER2	HSPF2	Heat @5°F	AHRI ref.
D5MUWAQ30XA3 · cold climate	17.5	11.7	10.2	32,000	217730617
D5MUWAQ30XA3 · cold climate	17.5	11.7	10.2	32,000	217730633
D5MUWAQ30XA3 · cold climate	17.5	11.7	10.2	32,000	217730649
D5MUWAQ30XA3 · cold climate	17.5	11.7	10.2	32,000	217730665
D5MUWAQ30XA3 · cold climate	17.5	11.7	10.2	32,000	217730681
45MUHAQ36XX3 · cold climate	17.2	12.1	10.8	33,200	215318762
45MUHAQ36XX3 · cold climate	17.2	12.1	10.8	33,200	215318790
45MUHAQ36XX3 · cold climate	17.2	12.1	10.8	33,200	215318818
45MUHAQ36XX3 · cold climate	17.2	12.1	10.8	33,200	215318846
45MUHAQ36XX3 · cold climate	17.2	12.1	10.8	33,200	215318874
D5FUHAH36XAK · cold climate	17.2	12.1	10.8	33,200	217557335
D5FUHAH36XAK · cold climate	17.2	12.1	10.8	33,200	217557344
D5FUHAH36XAK · cold climate	17.2	12.1	10.8	33,200	217730695
D5FUHAH36XAK · cold climate	17.2	12.1	10.8	33,200	217730701
D5FUHAH36XAK · cold climate	17.2	12.1	10.8	33,200	217730707
45MUAAQ30XX3 · cold climate	16.9	11.7	10.0	32,600	215318750
45MUAAQ30XX3 · cold climate	16.9	11.7	10.0	32,600	215318806
45MUAAQ30XX3 · cold climate	16.9	11.7	10.0	32,600	215318834
45MUAAQ30XX3 · cold climate	16.9	11.7	10.0	32,600	215318778
45MUAAQ30XX3 · cold climate	16.9	11.7	10.0	32,600	215318862
45MULAQ36XBX · cold climate	16.0	11.0	9.6	32,000	217456385
45MULAQ36XCX · cold climate	16.0	11.0	9.6	32,000	217456386
45MULAQ36XBX · cold climate	16.0	11.0	9.6	32,000	217456413
45MULAQ36XBX · cold climate	16.0	11.0	9.6	32,000	217456301
45MULAQ36XCX · cold climate	16.0	11.0	9.6	32,000	217456302
45MULAQ36XBX · cold climate	16.0	11.0	9.6	32,000	217456329
45MULAQ36XCX · cold climate	16.0	11.0	9.6	32,000	217456330
45MULAQ36XBX · cold climate	16.0	11.0	9.6	32,000	217456357
45MULAQ36XCX · cold climate	16.0	11.0	9.6	32,000	217456358
45MULAQ36XCX · cold climate	16.0	11.0	9.6	32,000	217456414
45MULAQ36XAX · cold climate	15.3	10.0	9.3	30,400	217456384
45MULAQ36XAX · cold climate	15.3	10.0	9.3	30,400	217456412
45MULAQ36XAX · cold climate	15.3	10.0	9.3	30,400	217456300
45MULAQ36XAX · cold climate	15.3	10.0	9.3	30,400	217456328
45MULAQ36XAX · cold climate	15.3	10.0	9.3	30,400	217456356

Yearly running cost in 10 large cities$783-$1,926

Phoenix, AZ$958/yr
Miami, FL$802/yr
Houston, TX$858/yr
Atlanta, GA$827/yr
Los Angeles, CA$795/yr
New York, NY$1,926/yr
Chicago, IL$1,554/yr
Denver, CO$1,284/yr
Seattle, WA$783/yr
Minneapolis, MN$1,586/yr

At each state's average electricity price and the city's typical heating and cooling hours.

Questions5

What is the SEER2 rating of the Carrier 37MUHAQ30AA3?: The Carrier 37MUHAQ30AA3 is rated at up to 17.5 SEER2 and 11.7 EER2 for cooling and up to 10.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 35 certified matchups SEER2 ranges from 15.3-17.5.
Is the Carrier 37MUHAQ30AA3 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 33,200 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
How much does the Carrier 37MUHAQ30AA3 cost to run per year?: At its rated efficiency it costs about $783-$1,926 a year in electricity in large U.S. cities, depending on climate and local rates - for example $958 in Phoenix and $1,586 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Which indoor units work with the Carrier 37MUHAQ30AA3?: ENERGY STAR lists 35 certified combinations for this outdoor unit. The highest-rated ones use D5MUWAQ30XA3, 45MUHAQ36XX3, D5FUHAH36XAK.
What refrigerant does the Carrier 37MUHAQ30AA3 use?: It uses R-454B.

Running cost and savings

Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

Heat pump $935/yrYou save $644/yrSee details ↓

1. Where you live

StateCityElectricity ¢ per kWh

Adjust heating and cooling hours

Filled in from your city's climate. Change them if you run the system much more or less than usual.

Cooling hours full-load hours per yearHeating hours full-load hours per year

2. The heat pump Carrier 37MUHAQ30AA3

Find a model (fills in the ratings below)

SEER2 cooling efficiencyHSPF2 heating efficiencyCooling capacity BTU/hHeating capacity BTU/h

3. What it replaces

Current heatingFurnace efficiency (AFUE %)Gas price, $/thermCurrent coolingOld AC rating SEER2 (10 ≈ 15+ years old)

4. Price replace the example with your quote

Installed price, $Rebates and incentives, $ utility, state

Heat pump, per year: $935
Current system, per year: $1,580
You save per year: $644
Payback: 17.8 years
Net after 10 years: -$5,057

Cooling $603Heating $332Electricity used: 5,846 kWhSaved vs. a minimum-efficiency heat pump: $281

Estimates use the unit's rated SEER2 and HSPF2, full-load hours derived from NOAA 1991-2020 degree days, average residential electricity prices from the U.S. EIA (12 months to July 2026) and fuel prices from EIA (2025 for natural gas, week of 2026-10-05 for propane and heating oil). Very cold days that need backup heat are not modelled. Federal minimum for comparison: 14.3 SEER2 / 7.5 HSPF2.

Similar 2.5 ton models

AI AIR CONDITIONING AUO19-30N2-M3H · cold climate17.5 SEER2 · 10.8 HSPF2
ComfortStar CPH3-30CD(O) · cold climate17.5 SEER2 · 10.8 HSPF2
ACIQ ACIQ-30-HPD · cold climate17.5 SEER2 · 10.8 HSPF2
Cooper&Hunter CH-PQ33-230VO · cold climate17.5 SEER2 · 10.8 HSPF2
Blueridge BNG1A30SCN · cold climate17.6 SEER2 · 9.2 HSPF2
Day & Night D5CUHAH30AAK · cold climate17.5 SEER2 · 10.8 HSPF2
Midea MO1AE-H30B-2A · cold climate17.7 SEER2 · 9.2 HSPF2
Innovair SHV30H2BA · cold climate17.5 SEER2 · 10.8 HSPF2

See all 199 2.5 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of March 26, 2026. How we use the data.