What is the SEER2 rating of the Carrier 37MURAQ48AA3?

The Carrier 37MURAQ48AA3 is rated at up to 16.0 SEER2 and 10.0 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 10 certified matchups SEER2 ranges from 15.2-16.0.

Is the Carrier 37MURAQ48AA3 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 40,000 BTU/h at 5°F with a COP of 1.85, so it is still 1.9 times as efficient as electric resistance heat at that temperature.

How much does the Carrier 37MURAQ48AA3 cost to run per year?

At its rated efficiency it costs about $1,405-$3,446 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,689 in Phoenix and $2,846 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 37MURAQ48AA3?

ENERGY STAR lists 10 certified combinations for this outdoor unit. The highest-rated ones use 45MUAAQ48XX3, 45MULAQ60XMX.

4-ton central heat pump · 45M Series

Carrier 37MURAQ48AA3

Below average cooling efficiency and average heating efficiency for a 4-ton central heat pump, and certified for cold climates.

Ranks #215 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,472 a year to run in a mixed climate like Atlanta.

SEER2: 16.0 Cooling efficiency over a season
Below average · beats 26%
HSPF2: 9.0 Heating efficiency over a season
Average · beats 54%
EER2: 10.0 Cooling efficiency on a 95°F day
Below average · beats 10%
Heat at 5°F: 40,000 BTU/h79% of its 47°F output
Below average · beats 12%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 40,000 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 10 certified pairings.

Think twice if…

Cooling cost matters most - its SEER2 is below average for central heat pumps.

Calculate my running cost

Details

Specifications4 ton, R-454B

General
Brand	Carrier
Also sold as	Bryant, Payne, WeatherMaker, Midea
Outdoor unit model	37MURAQ48AA3
Series	45M Series
Type	Central heat pump
Nominal size	4 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	May 1, 2026
Cooling
SEER2Seasonal efficiency, higher is better	16.0 (range 15.2-16.0)
EER2Efficiency at 95°F outdoors	10.0
Cooling capacity	45,000-48,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.5-9.0
Capacity at 47°F	47,000-48,000 BTU/h
Capacity at 17°F	33,000-34,800 BTU/h
Capacity at 5°F	38,000-40,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.85
ENERGY STAR cold climate	Yes

Heating output as it gets colder79% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 45MUAAQ48XX3 at the standard test temperatures, in BTU/h:

Certified matchups10 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.
45MUAAQ48XX3 · cold climate	16.0	10.0	8.5	38,000	215318759
45MUAAQ48XX3 · cold climate	16.0	10.0	8.5	38,000	215318787
45MUAAQ48XX3 · cold climate	16.0	10.0	8.5	38,000	215318815
45MUAAQ48XX3 · cold climate	16.0	10.0	8.5	38,000	215318843
45MUAAQ48XX3 · cold climate	16.0	10.0	8.5	38,000	215318871
45MULAQ60XMX · cold climate	15.2	10.0	9.0	40,000	217456348
45MULAQ60XMX · cold climate	15.2	10.0	9.0	40,000	217456432
45MULAQ60XMX · cold climate	15.2	10.0	9.0	40,000	217456404
45MULAQ60XMX · cold climate	15.2	10.0	9.0	40,000	217456320
45MULAQ60XMX · cold climate	15.2	10.0	9.0	40,000	217456376

Yearly running cost in 10 large cities$1,405-$3,446

Phoenix, AZ$1,689/yr
Miami, FL$1,405/yr
Houston, TX$1,512/yr
Atlanta, GA$1,472/yr
Los Angeles, CA$1,419/yr
New York, NY$3,446/yr
Chicago, IL$2,784/yr
Denver, CO$2,303/yr
Seattle, WA$1,407/yr
Minneapolis, MN$2,846/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 37MURAQ48AA3?: The Carrier 37MURAQ48AA3 is rated at up to 16.0 SEER2 and 10.0 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 10 certified matchups SEER2 ranges from 15.2-16.0.
Is the Carrier 37MURAQ48AA3 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 40,000 BTU/h at 5°F with a COP of 1.85, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
How much does the Carrier 37MURAQ48AA3 cost to run per year?: At its rated efficiency it costs about $1,405-$3,446 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,689 in Phoenix and $2,846 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 37MURAQ48AA3?: ENERGY STAR lists 10 certified combinations for this outdoor unit. The highest-rated ones use 45MUAAQ48XX3, 45MULAQ60XMX.
What refrigerant does the Carrier 37MURAQ48AA3 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 $1,653/yrYou save $822/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 37MURAQ48AA3

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: $1,653
Current system, per year: $2,475
You save per year: $822
Payback: 21.9 years
Net after 10 years: -$9,783

Cooling $1,056Heating $597Electricity used: 10,333 kWhSaved vs. a minimum-efficiency heat pump: $245

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.

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Blueridge BNG2A48SCN · cold climate16.0 SEER2 · 9.0 HSPF2
Day & Night D5CURAH48AAK · cold climate16.0 SEER2 · 9.0 HSPF2
1HVAC ACIQ-48-EHPD · cold climate16.0 SEER2 · 9.0 HSPF2
Elios ESHMA60R2AN1 · cold climate16.0 SEER2 · 9.0 HSPF2
MRCOOL CENTRAL-60-HP-C-230B00-O · cold climate16.0 SEER2 · 9.1 HSPF2
InfinityLiving EZ-60-HPB · cold climate16.0 SEER2 · 9.0 HSPF2

See all 319 4 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 1, 2026. How we use the data.