What is the SEER2 rating of the Carrier 37MAHAQ33AA3?

The Carrier 37MAHAQ33AA3 is rated at up to 19.6 SEER2 and 12.0 EER2 for cooling and up to 10.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 12 certified matchups SEER2 ranges from 16.7-19.6.

Is the Carrier 37MAHAQ33AA3 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 35,000 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 37MAHAQ33AA3 cost to run per year?

At its rated efficiency it costs about $792-$2,156 a year in electricity in large U.S. cities, depending on climate and local rates - for example $981 in Phoenix and $1,806 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 37MAHAQ33AA3?

ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use CARRIER 45MAHAQ33XA3, BRYANT 615AHAQ33XA3, PAYNE D5MAHAQ33XA3.

30,000 BTU mini-split heat pump · 45M Series

Carrier 37MAHAQ33AA3

Below average cooling efficiency and average heating efficiency for a 30,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #141 of 171 30,000 BTU mini-splits for cooling efficiency, and costs about $898 a year to run in a mixed climate like Atlanta.

SEER2: 19.6 Cooling efficiency over a season
Below average · beats 13%
HSPF2: 10.5 Heating efficiency over a season
Average · beats 61%
EER2: 12.0 Cooling efficiency on a 95°F day
Below average · beats 25%
Heat at 5°F: 35,000 BTU/h97% of its 47°F output
Average · beats 48%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 35,000 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 12 certified pairings.

Think twice if…

Cooling cost matters most - its SEER2 is below average for mini-splits.

Calculate my running cost

Details

Specifications30,000 BTU, R-454B

General
Brand	Carrier
Also sold as	Bryant, Payne, WeatherMaker, Midea
Outdoor unit model	37MAHAQ33AA3
Series	45M Series
Type	Mini-split heat pump
Nominal size	30,000 BTU
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	September 23, 2026
Cooling
SEER2Seasonal efficiency, higher is better	19.6 (range 16.7-19.6)
EER2Efficiency at 95°F outdoors	11.7-12.0
Cooling capacity	33,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0-10.5
Capacity at 47°F	35,000-36,000 BTU/h
Capacity at 17°F	27,400-32,000 BTU/h
Capacity at 5°F	34,000-35,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.98-2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder97% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 45MAHAQ33XA3 at the standard test temperatures, in BTU/h:

Certified matchups12 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.
45MAHAQ33XA3 CARRIER · cold climate	19.6	12.0	10.5	35,000	215323747
615AHAQ33XA3 BRYANT · cold climate	19.6	12.0	10.5	35,000	215323758
D5MAHAQ33XA3 PAYNE · cold climate	19.6	12.0	10.5	35,000	215323769
D5MAHAQ33XA3 Weathermaker · cold climate	19.6	12.0	10.5	35,000	215323780
D5MAHAQ33XA3 MIDEA · cold climate	19.6	12.0	10.5	35,000	215323791
D5MAHAQ33XA3 BRYANT · cold climate	19.6	12.0	10.5	35,000	218139567
D5MAHAQ33XA3 CARRIER · cold climate	19.6	12.0	10.5	35,000	218139554
45MBAAQ36XB3 · cold climate	16.7	11.7	10.0	34,000	215318766
45MBAAQ36XB3 · cold climate	16.7	11.7	10.0	34,000	215318794
45MBAAQ36XB3 · cold climate	16.7	11.7	10.0	34,000	215318822
45MBAAQ36XB3 · cold climate	16.7	11.7	10.0	34,000	215318878
45MBAAQ36XB3 · cold climate	16.7	11.7	10.0	34,000	215318850

Yearly running cost in 10 large cities$792-$2,156

Phoenix, AZ$981/yr
Miami, FL$792/yr
Houston, TX$880/yr
Atlanta, GA$898/yr
Los Angeles, CA$876/yr
New York, NY$2,156/yr
Chicago, IL$1,752/yr
Denver, CO$1,458/yr
Seattle, WA$897/yr
Minneapolis, MN$1,806/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 37MAHAQ33AA3?: The Carrier 37MAHAQ33AA3 is rated at up to 19.6 SEER2 and 12.0 EER2 for cooling and up to 10.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 12 certified matchups SEER2 ranges from 16.7-19.6.
Is the Carrier 37MAHAQ33AA3 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 35,000 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 37MAHAQ33AA3 cost to run per year?: At its rated efficiency it costs about $792-$2,156 a year in electricity in large U.S. cities, depending on climate and local rates - for example $981 in Phoenix and $1,806 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 37MAHAQ33AA3?: ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use CARRIER 45MAHAQ33XA3, BRYANT 615AHAQ33XA3, PAYNE D5MAHAQ33XA3.
What refrigerant does the Carrier 37MAHAQ33AA3 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 $977/yrYou save $774/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 37MAHAQ33AA3

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: $977
Current system, per year: $1,751
You save per year: $774
Payback: 16.1 years
Net after 10 years: -$4,760

Cooling $593Heating $384Electricity used: 6,104 kWhSaved vs. a minimum-efficiency heat pump: $373

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 30,000 BTU models

Lennox 3WPD036S6S-1P · cold climate20.0 SEER2 · 9.0 HSPF2
Comfort-Aire A-VHP33SA-1 · cold climate19.5 SEER2 · 10.5 HSPF2
MDV MOD30-30HFN1-MS0W-L20.0 SEER2 · 9.2 HSPF2
Mainline ML33HP230CALH-O · cold climate19.5 SEER2 · 10.5 HSPF2
Mainline ML30HP230GEN-O · cold climate20.0 SEER2 · 9.2 HSPF2
Midea MO1HS-H33B-2A · cold climate19.5 SEER2 · 10.5 HSPF2
Innovair MOS30H2BE5A20.0 SEER2 · 9.2 HSPF2
MOOVAIR MSHMA33C2AN1 · cold climate19.5 SEER2 · 10.5 HSPF2

See all 171 30,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 23, 2026. How we use the data.