What is the SEER2 rating of the Comfortmaker C5H3V48*K*AAA?

The Comfortmaker C5H3V48*K*AAA is rated at up to 23.0 SEER2 and 12.5 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 414 certified matchups SEER2 ranges from 19.5-23.0.

Is the Comfortmaker C5H3V48*K*AAA good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 38,500 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 Comfortmaker C5H3V48*K*AAA cost to run per year?

At its rated efficiency it costs about $929-$3,078 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,227 in Phoenix and $2,635 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 Comfortmaker C5H3V48*K*AAA?

ENERGY STAR lists 414 certified combinations for this outdoor unit. The highest-rated ones use FCMA5B60L0D*+WALLCON, FCMA5B48L0C*+WALLCON, EA*5X61M21A*+WALLCON.

3.5-ton central heat pump · SoftSound 23 VS Heat Pump

Comfortmaker C5H3V48KAAA

Excellent cooling efficiency and very good heating efficiency for a 3.5-ton central heat pump, and certified for cold climates.

Ranks #3 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,230 a year to run in a mixed climate like Atlanta.

SEER2: 23.0 Cooling efficiency over a season
Excellent · beats 99%
HSPF2: 9.5 Heating efficiency over a season
Very good · beats 70%
EER2: 12.5 Cooling efficiency on a 95°F day
Very good · beats 80%
Heat at 5°F: 38,500 BTU/h74% of its 47°F output
Below average · beats 39%

A good fit if…

You want low cooling bills - its SEER2 beats 99% of central heat pumps.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 38,500 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 70% of central heat pumps.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

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

Calculate my running cost

Details

Specifications3.5 ton, R-454B

General
Brand	Comfortmaker
Also sold as	Day & Night, Keeprite
Outdoor unit model	C5H3V48KAAA
Series	SoftSound 23 VS Heat Pump
Type	Central heat pump
Nominal size	3.5 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	November 1, 2024
Last certified	July 16, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.0 (range 19.5-23.0)
EER2Efficiency at 95°F outdoors	10.0-12.5
Cooling capacity	43,000-46,500 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.0-9.5
Capacity at 47°F	48,000-53,500 BTU/h
Capacity at 17°F	39,000-43,500 BTU/h
Capacity at 5°F	35,600-38,500 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 colder74% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with FCMA5B60L0D*+WALLCON at the standard test temperatures, in BTU/h:

Certified matchups414 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 414 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

Indoor unit	Furnace	SEER2	EER2	HSPF2	Heat @5°F	AHRI ref.
FCMA5B60L0D*+WALLCON · cold climate	-	23.0	12.5	9.5	35,600	215931510
FCMA5B60L0D*+WALLCON · cold climate	-	23.0	12.5	9.5	35,600	215931511
FCMA5B60L0D*+WALLCON · cold climate	-	23.0	12.5	9.5	35,600	215931509
FCMA5B48L0C*+WALLCON · cold climate	-	22.0	12.0	9.5	36,000	215934619
FCMA5B48L0C*+WALLCON · cold climate	-	22.0	12.0	9.5	36,000	215934620
FCMA5B48L0C*+WALLCON · cold climate	-	22.0	12.0	9.5	36,000	215934621
EA5X61M21A+WALLCON · cold climate	80CTL0902120B	21.5	11.5	9.5	36,600	215934189
EA5X61M21A+WALLCON · cold climate	80CTL0902120B	21.5	11.5	9.5	36,600	215934190
EA5X61M21A+WALLCON · cold climate	80CTL0902120B	21.5	11.5	9.5	36,600	215934191
EA5X61M21A+WALLCON · cold climate	95CSU1002122B	21.5	11.5	9.5	36,600	215934229
EA5X61M21A+WALLCON · cold climate	95CSU1002122B	21.5	11.5	9.5	36,600	215934230
EA5X61M21A+WALLCON · cold climate	95CSU1002122B	21.5	11.5	9.5	36,600	215934231
EA5X60M24A+WALLCON · cold climate	80CTL1102120B	21.5	11.0	9.5	36,200	215934109
EA5X60M24A+WALLCON · cold climate	80CTL1102120B	21.5	11.0	9.5	36,200	215934110
EA5X60M24A+WALLCON · cold climate	80CTL1102120B	21.5	11.0	9.5	36,200	215934111
EA5X60M24A+WALLCON · cold climate	80CTL1352422B	21.5	11.5	9.5	36,200	215934119
EA5X60M24A+WALLCON · cold climate	80CTL1352422B	21.5	11.5	9.5	36,200	215934120
EA5X60M24A+WALLCON · cold climate	80CTL1352422B	21.5	11.5	9.5	36,200	215934121
EA5X61M21A+WALLCON · cold climate	80CSU0401712B	21.5	11.5	9.5	36,800	215941049
EA5X61M21A+WALLCON · cold climate	80CSU0401712B	21.5	11.5	9.5	36,800	215941050
EA5X61M21A+WALLCON · cold climate	80CSU0401712B	21.5	11.5	9.5	36,800	215941051
EA5X61M24A+WALLCON · cold climate	97CTN1002122A	21.5	11.0	9.5	36,800	215941120
EA5X61M24A+WALLCON · cold climate	97CTN1002122A	21.5	11.0	9.5	36,800	215941119
EA5X61M24A+WALLCON · cold climate	97CTN1002122A	21.5	11.0	9.5	36,800	215941121
EA5X61M24A+WALLCON · cold climate	97CTN1202422A	21.5	11.5	9.5	36,600	215941129
EA5X61M24A+WALLCON · cold climate	97CTN1202422A	21.5	11.5	9.5	36,600	215941130
EA5X61M24A+WALLCON · cold climate	97CTN1202422A	21.5	11.5	9.5	36,600	215941131
EA5X61M24A+WALLCON · cold climate	96CTN1202422B	21.5	11.5	9.5	36,800	215934419
EA5X61M24A+WALLCON · cold climate	96CTN1202422B	21.5	11.5	9.5	36,800	215934420
EA5X61M24A+WALLCON · cold climate	96CTN1202422B	21.5	11.5	9.5	36,800	215934421
EA5X61M24A+WALLCON · cold climate	96CTN1002122B	21.5	11.0	9.5	36,600	215934409
EA5X61M24A+WALLCON · cold climate	96CTN1002122B	21.5	11.0	9.5	36,600	215934410
EA5X61M24A+WALLCON · cold climate	96CTN1002122B	21.5	11.0	9.5	36,600	215934411
EA5X61M24A+WALLCON · cold climate	97CMN1002122B	21.5	11.0	9.5	36,600	215934389
EA5X61M24A+WALLCON · cold climate	97CMN1002122B	21.5	11.0	9.5	36,600	215934390
EA5X61M24A+WALLCON · cold climate	97CMN1002122B	21.5	11.0	9.5	36,600	215934391
EA5X61M24A+WALLCON · cold climate	95CSU1002122B	21.5	11.5	9.5	36,600	215934359
EA5X61M24A+WALLCON · cold climate	95CSU1002122B	21.5	11.5	9.5	36,600	215934360
EA5X61M24A+WALLCON · cold climate	95CSU1002122B	21.5	11.5	9.5	36,600	215934361
EA5X61M21A+WALLCON · cold climate	80CTL1102120B	21.5	11.0	9.5	36,800	215934199
EA5X61M21A+WALLCON · cold climate	80CTL1102120B	21.5	11.0	9.5	36,800	215934200
EA5X61M21A+WALLCON · cold climate	80CTL1102120B	21.5	11.0	9.5	36,800	215934201
EA5X61M24A+WALLCON · cold climate	80CTL1352422B	21.5	11.5	9.5	36,600	215934339
EA5X61M24A+WALLCON · cold climate	80CTL1352422B	21.5	11.5	9.5	36,600	215934340
EA5X61M24A+WALLCON · cold climate	80CTL1352422B	21.5	11.5	9.5	36,600	215934341
EA5X61M24A+WALLCON · cold climate	80CTL1102120B	21.5	11.5	9.5	36,600	215934329
EA5X61M24A+WALLCON · cold climate	80CTL1102120B	21.5	11.5	9.5	36,600	215934330
EA5X61M24A+WALLCON · cold climate	80CTL1102120B	21.5	11.5	9.5	36,600	215934331
EA5X61M24A+WALLCON · cold climate	80CTL0902120B	21.5	11.5	9.5	36,600	215934319
EA5X61M24A+WALLCON · cold climate	80CTL0902120B	21.5	11.5	9.5	36,600	215934320
EA5X61M24A+WALLCON · cold climate	80CTL0902120B	21.5	11.5	9.5	36,600	215934321
EA5X60M24A+WALLCON · cold climate	95CSU0802120B	21.0	11.0	9.5	36,600	215934129
EA5X60M24A+WALLCON · cold climate	95CSU0802120B	21.0	11.0	9.5	36,600	215934130
EA5X60M24A+WALLCON · cold climate	95CSU0802120B	21.0	11.0	9.5	36,600	215934131
EA5X61M21A+WALLCON · cold climate	80CSU1002120A	21.0	11.0	9.5	37,000	215934139
EA5X61M21A+WALLCON · cold climate	80CSU1002120A	21.0	11.0	9.5	37,000	215934140
EA5X61M21A+WALLCON · cold climate	80CSU1002120A	21.0	11.0	9.5	37,000	215934141
EA5X61M21A+WALLCON · cold climate	95CSU0802120B	21.0	11.0	9.5	37,000	215934219
EA5X61M21A+WALLCON · cold climate	95CSU0802120B	21.0	11.0	9.5	37,000	215934220
EA5X61M21A+WALLCON · cold climate	95CSU0802120B	21.0	11.0	9.5	37,000	215934221

Yearly running cost in 10 large cities$929-$3,078

Phoenix, AZ$1,227/yr
Miami, FL$929/yr
Houston, TX$1,103/yr
Atlanta, GA$1,230/yr
Los Angeles, CA$1,222/yr
New York, NY$3,078/yr
Chicago, IL$2,526/yr
Denver, CO$2,121/yr
Seattle, WA$1,320/yr
Minneapolis, MN$2,635/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 Comfortmaker C5H3V48*K*AAA?: The Comfortmaker C5H3V48*K*AAA is rated at up to 23.0 SEER2 and 12.5 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 414 certified matchups SEER2 ranges from 19.5-23.0.
Is the Comfortmaker C5H3V48*K*AAA good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 38,500 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 Comfortmaker C5H3V48*K*AAA cost to run per year?: At its rated efficiency it costs about $929-$3,078 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,227 in Phoenix and $2,635 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 Comfortmaker C5H3V48*K*AAA?: ENERGY STAR lists 414 certified combinations for this outdoor unit. The highest-rated ones use FCMA5B60L0D*+WALLCON, FCMA5B48L0C*+WALLCON, EA*5X61M21A*+WALLCON.
What refrigerant does the Comfortmaker C5H3V48*K*AAA 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 $1,260/yrYou save $1,117/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 Comfortmaker C5H3V48*K*AAA

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: $1,260
Current system, per year: $2,378
You save per year: $1,117
Payback: 15.2 years
Net after 10 years: -$5,829

Cooling $689Heating $572Electricity used: 7,878 kWhSaved vs. a minimum-efficiency heat pump: $571

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 3.5 ton models

Carrier 27VNA348A*030 · cold climate23.0 SEER2 · 9.5 HSPF2
Heil H5H3V48*K*AAA · cold climate23.0 SEER2 · 9.5 HSPF2
Bryant 293VAN048**AA · cold climate23.0 SEER2 · 9.5 HSPF2
Tempstar B5H3V48*K*AAA · cold climate23.0 SEER2 · 9.5 HSPF2
Tempstar T5H3V48*K*AAA · cold climate23.0 SEER2 · 9.5 HSPF2
Carrier 25VNA448A*031 · cold climate21.0 SEER2 · 9.0 HSPF2
Trane 5TWV0X48A1 · cold climate20.8 SEER2 · 10.0 HSPF2
Lennox SL22KLV-048-230A · cold climate20.5 SEER2 · 9.8 HSPF2

See all 138 3.5 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 16, 2026. How we use the data.