What is the SEER2 rating of the ComfortStar CPH24CD(O)?

The ComfortStar CPH24CD(O) is rated at up to 17.4 SEER2 and 11.7 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 16.5-17.4.

Is the ComfortStar CPH24CD(O) good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 22,600 BTU/h at 5°F with a COP of 1.95, so it is still 2.0 times as efficient as electric resistance heat at that temperature.

How much does the ComfortStar CPH24CD(O) cost to run per year?

At its rated efficiency it costs about $646-$1,609 a year in electricity in large U.S. cities, depending on climate and local rates - for example $780 in Phoenix and $1,331 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the ComfortStar CPH24CD(O) the same as the KERR A-KCD24SA-1?

Yes, as far as the certified ratings go. ENERGY STAR lists both model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.

Which indoor units work with the ComfortStar CPH24CD(O)?

ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use AHU24-SG2, ACP-24B, UACP-24B.

What refrigerant does the ComfortStar CPH24CD(O) use?

It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

2-ton central heat pump · AHU series

ComfortStar CPH24CD(O)

Average cooling efficiency and very good heating efficiency for a 2-ton central heat pump, and certified for cold climates.

Ranks #206 of 331 2 ton central heat pumps for cooling efficiency, and costs about $685 a year to run in a mixed climate like Atlanta.

SEER2: 17.4 Cooling efficiency over a season
Average · beats 55%
HSPF2: 10.0 Heating efficiency over a season
Very good · beats 84%
EER2: 11.7 Cooling efficiency on a 95°F day
Average · beats 43%
Heat at 5°F: 22,600 BTU/h94% of its 47°F output
Below average · beats 27%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 22,600 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 84% of central heat pumps.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications2 ton, R-410A

General
Brand	ComfortStar
Also sold as	KERR
Outdoor unit model	CPH24CD(O)
Series	AHU series
Type	Central heat pump
Nominal size	2 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	July 13, 2023
Last certified	June 9, 2026
Cooling
SEER2Seasonal efficiency, higher is better	17.4 (range 16.5-17.4)
EER2Efficiency at 95°F outdoors	10.7-11.7
Cooling capacity	24,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.5-10.0
Capacity at 47°F	24,000-25,000 BTU/h
Capacity at 17°F	19,200-21,000 BTU/h
Capacity at 5°F	20,000-22,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.91-1.95
ENERGY STAR cold climate	Yes

Heating output as it gets colder94% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with AHU24-SG2 at the standard test temperatures, in BTU/h:

Certified matchups3 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.
AHU24-SG2 · cold climate	17.4	11.7	10.0	22,600	212940790
ACP-24B · cold climate	16.5	10.7	9.5	20,000	213386518
UACP-24B · cold climate	16.5	10.7	9.5	20,000	213386530

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the ComfortStar CPH24CD(O): the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

KERR A-KCD24SA-1

Yearly running cost in 10 large cities$646-$1,609

Phoenix, AZ$780/yr
Miami, FL$646/yr
Houston, TX$699/yr
Atlanta, GA$685/yr
Los Angeles, CA$661/yr
New York, NY$1,609/yr
Chicago, IL$1,301/yr
Denver, CO$1,077/yr
Seattle, WA$659/yr
Minneapolis, MN$1,331/yr

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

Questions6

What is the SEER2 rating of the ComfortStar CPH24CD(O)?: The ComfortStar CPH24CD(O) is rated at up to 17.4 SEER2 and 11.7 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 16.5-17.4.
Is the ComfortStar CPH24CD(O) good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 22,600 BTU/h at 5°F with a COP of 1.95, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
How much does the ComfortStar CPH24CD(O) cost to run per year?: At its rated efficiency it costs about $646-$1,609 a year in electricity in large U.S. cities, depending on climate and local rates - for example $780 in Phoenix and $1,331 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the ComfortStar CPH24CD(O) the same as the KERR A-KCD24SA-1?: Yes, as far as the certified ratings go. ENERGY STAR lists both model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
Which indoor units work with the ComfortStar CPH24CD(O)?: ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use AHU24-SG2, ACP-24B, UACP-24B.
What refrigerant does the ComfortStar CPH24CD(O) use?: It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

Running cost and savings

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

Heat pump $766/yrYou save $488/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 ComfortStar CPH24CD(O)

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: $766
Current system, per year: $1,254
You save per year: $488
Payback: 18.4 years
Net after 10 years: -$4,117

Cooling $486Heating $280Electricity used: 4,784 kWhSaved vs. a minimum-efficiency heat pump: $199

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 ton models

Comfort-Aire A-VCD24SA-1 · cold climate17.4 SEER2 · 10.0 HSPF2
Custom Comfort CCOXHA24V24HP · cold climate17.4 SEER2 · 10.0 HSPF2
Blueridge BMAH2420C · cold climate17.4 SEER2 · 10.0 HSPF2
EMI MHSD124DACFC · cold climate17.4 SEER2 · 10.0 HSPF2
1HVAC EZ-24-HP · cold climate17.4 SEER2 · 10.0 HSPF2
MRCOOL CENTRAL-24-HP-C-230A00 · cold climate17.4 SEER2 · 10.0 HSPF2
Kepler AZPN/24WD · cold climate17.4 SEER2 · 10.2 HSPF2
Panasonic CU-HE24YAHK6 · cold climate17.4 SEER2 · 10.0 HSPF2

See all 331 2 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 9, 2026. How we use the data.