What is the SEER2 rating of the Carrier 37MBHAQ48AA3?

The Carrier 37MBHAQ48AA3 is rated at up to 18.7 SEER2 and 9.4 EER2 for cooling and up to 11.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 20 certified matchups SEER2 ranges from 16.8-18.7.

Is the Carrier 37MBHAQ48AA3 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 47,500 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 37MBHAQ48AA3 cost to run per year?

At its rated efficiency it costs about $1,203-$3,032 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,458 in Phoenix and $2,513 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 37MBHAQ48AA3?

ENERGY STAR lists 20 certified combinations for this outdoor unit. The highest-rated ones use CARRIER 45MCFAQ48XA3, BRYANT 45MCFAQ48XA3, PAYNE 45MCFAQ48XA3.

48,000 BTU mini-split heat pump · 45M Series

Carrier 37MBHAQ48AA3

Below average cooling efficiency and very good heating efficiency for a 48,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #106 of 146 48,000 BTU mini-splits for cooling efficiency, and costs about $1,287 a year to run in a mixed climate like Atlanta.

SEER2: 18.7 Cooling efficiency over a season
Below average · beats 7%
HSPF2: 11.0 Heating efficiency over a season
Very good · beats 75%
EER2: 9.4 Cooling efficiency on a 95°F day
Below average · beats 2%
Heat at 5°F: 47,500 BTU/h90% 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 47,500 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 75% of mini-splits.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 20 certified pairings.

Think twice if…

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

Calculate my running cost

Details

Specifications48,000 BTU, R-454B

General
Brand	Carrier
Also sold as	WeatherMaker, Bryant, Payne, Midea
Outdoor unit model	37MBHAQ48AA3
Series	45M Series
Type	Mini-split heat pump
Nominal size	48,000 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	March 13, 2025
Cooling
SEER2Seasonal efficiency, higher is better	18.7 (range 16.8-18.7)
EER2Efficiency at 95°F outdoors	9.4-10.4
Cooling capacity	48,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.1-11.0
Capacity at 47°F	50,000-53,000 BTU/h
Capacity at 17°F	38,500-45,000 BTU/h
Capacity at 5°F	46,000-47,500 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.83-2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder90% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 45MCFAQ48XA3 at the standard test temperatures, in BTU/h:

Certified matchups20 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.
45MCFAQ48XA3 CARRIER · cold climate	18.7	9.4	10.1	47,000	215323846
45MCFAQ48XA3 BRYANT · cold climate	18.7	9.4	10.1	47,000	215323907
45MCFAQ48XA3 PAYNE · cold climate	18.7	9.4	10.1	47,000	215323968
45MCFAQ48XA3 Weathermaker · cold climate	18.7	9.4	10.1	47,000	215324029
45MCFAQ48XA3 MIDEA · cold climate	18.7	9.4	10.1	47,000	215324090
45MBCAQ48XA3 CARRIER · cold climate	18.2	10.0	11.0	47,500	215323845
45MBCAQ48XA3 Weathermaker · cold climate	18.2	10.0	11.0	47,500	215324028
45MBCAQ48XA3 BRYANT · cold climate	18.2	10.0	11.0	47,500	215323906
45MBCAQ48XA3 PAYNE · cold climate	18.2	10.0	11.0	47,500	215323967
45MBCAQ48XA3 MIDEA · cold climate	18.2	10.0	11.0	47,500	215324089
45MBAAQ48XA3 · cold climate	17.0	10.1	10.2	46,000	215318770
45MBAAQ48XA3 · cold climate	17.0	10.1	10.2	46,000	215318798
45MBAAQ48XA3 · cold climate	17.0	10.1	10.2	46,000	215318826
45MBAAQ48XA3 · cold climate	17.0	10.1	10.2	46,000	215318882
45MBAAQ48XA3 · cold climate	17.0	10.1	10.2	46,000	215318854
45MBDAQ48XH3 CARRIER · cold climate	16.8	10.4	10.8	47,500	215323847
45MBDAQ48XH3 BRYANT · cold climate	16.8	10.4	10.8	47,500	215323908
45MBDAQ48XH3 PAYNE · cold climate	16.8	10.4	10.8	47,500	215323969
45MBDAQ48XH3 Weathermaker · cold climate	16.8	10.4	10.8	47,500	215324030
45MBDAQ48XH3 MIDEA · cold climate	16.8	10.4	10.8	47,500	215324091

Yearly running cost in 10 large cities$1,203-$3,032

Phoenix, AZ$1,458/yr
Miami, FL$1,203/yr
Houston, TX$1,305/yr
Atlanta, GA$1,287/yr
Los Angeles, CA$1,244/yr
New York, NY$3,032/yr
Chicago, IL$2,453/yr
Denver, CO$2,033/yr
Seattle, WA$1,244/yr
Minneapolis, MN$2,513/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 37MBHAQ48AA3?: The Carrier 37MBHAQ48AA3 is rated at up to 18.7 SEER2 and 9.4 EER2 for cooling and up to 11.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 20 certified matchups SEER2 ranges from 16.8-18.7.
Is the Carrier 37MBHAQ48AA3 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 47,500 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 37MBHAQ48AA3 cost to run per year?: At its rated efficiency it costs about $1,203-$3,032 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,458 in Phoenix and $2,513 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 37MBHAQ48AA3?: ENERGY STAR lists 20 certified combinations for this outdoor unit. The highest-rated ones use CARRIER 45MCFAQ48XA3, BRYANT 45MCFAQ48XA3, PAYNE 45MCFAQ48XA3.
What refrigerant does the Carrier 37MBHAQ48AA3 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 $1,433/yrYou save $1,107/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 37MBHAQ48AA3

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: $1,433
Current system, per year: $2,540
You save per year: $1,107
Payback: 16.3 years
Net after 10 years: -$6,925

Cooling $904Heating $529Electricity used: 8,956 kWhSaved vs. a minimum-efficiency heat pump: $525

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 48,000 BTU models

Arcoaire D5CLHAH48AAK · cold climate18.7 SEER2 · 11.0 HSPF2
MDV MOE30-48HFN10-M2X · cold climate18.7 SEER2 · 11.0 HSPF2
MDV MOE30U-48HFN1-MP0(GA)-L · cold climate18.9 SEER2 · 9.7 HSPF2
MDV MOE30U-48HFN1-M[X] · cold climate18.7 SEER2 · 11.0 HSPF2
Lennox MPC048S4S-1P · cold climate18.9 SEER2 · 9.7 HSPF2
Arcoaire D5CMTAH48FAK · cold climate18.7 SEER2 · 9.5 HSPF2
MDV MOE30U-48HFN1-MP0(GA) · cold climate18.9 SEER2 · 10.0 HSPF2
Lennox LISH048000P431-D · cold climate18.9 SEER2 · 10.0 HSPF2

See all 146 48,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of March 13, 2025. How we use the data.