What is the SEER2 rating of the Heil H5H6S24*K*AAA?

The Heil H5H6S24*K*AAA is rated at up to 16.5 SEER2 and 13.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 579 certified matchups SEER2 ranges from 15.2-16.5.

Is the Heil H5H6S24*K*AAA good for cold climates?

It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 2-ton model.

How much does the Heil H5H6S24*K*AAA cost to run per year?

At its rated efficiency it costs about $676-$1,705 a year in electricity in large U.S. cities, depending on climate and local rates - for example $819 in Phoenix and $1,413 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Heil H5H6S24*K*AAA the same as the Comfortmaker C5H6S24*K*AAA?

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 Heil H5H6S24*K*AAA?

ENERGY STAR lists 579 certified combinations for this outdoor unit. The highest-rated ones use FMA5X30**AL, EA*5X37M21A, EVM5X31M17A.

2-ton central heat pump · MAINLINE 16 SEER2 HP

Heil H5H6S24KAAA

Average cooling efficiency and below average heating efficiency for a 2-ton central heat pump, but not rated for cold climates.

Ranks #260 of 331 2 ton central heat pumps for cooling efficiency, and costs about $723 a year to run in a mixed climate like Atlanta.

SEER2: 16.5 Cooling efficiency over a season
Average · beats 40%
HSPF2: 8.5 Heating efficiency over a season
Below average · beats 38%
EER2: 13.0 Cooling efficiency on a 95°F day
Very good · beats 89%
Heat at 5°F: 11,900 BTU/h49% of its 47°F output
Very good · beats 83%

A good fit if…

You want a choice of indoor units - 579 certified pairings.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
You mainly need heat - its HSPF2 is below average for central heat pumps.
Comfort and noise matter - a single-stage compressor runs only full-on or off.

Calculate my running cost

Details

Specifications2 ton, R-454B

General
Brand	Heil
Also sold as	Airquest, Arcoaire, Comfortmaker, Day & Night, Keeprite
Outdoor unit model	H5H6S24KAAA
Series	MAINLINE 16 SEER2 HP
Type	Central heat pump
Nominal size	2 ton
CompressorVariable-speed units run longer at low power	Single stage
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	January 1, 2024
Last certified	July 16, 2026
Cooling
SEER2Seasonal efficiency, higher is better	16.5 (range 15.2-16.5)
EER2Efficiency at 95°F outdoors	11.7-13.0
Cooling capacity	22,200-24,400 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.5
Capacity at 47°F	21,600-24,000 BTU/h
Capacity at 17°F	14,200-15,200 BTU/h
Capacity at 5°F	10,800-11,900 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.98-2.26
ENERGY STAR cold climate	No

Heating output as it gets colder49% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with FMA5X30**AL at the standard test temperatures, in BTU/h:

Certified matchups579 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 579 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.
FMA5X30**AL	-	16.5	13.0	8.5	11,600	214424123
FMA5X30**AL	-	16.5	13.0	8.5	11,600	214424124
FMA5X30**AL	-	16.5	13.0	8.5	11,600	214424125
EA*5X37M21A	97VTN1002120A	16.0	12.5	8.0	11,500	215802385
EA*5X37M21A	97VTN1002120A	16.0	12.5	8.0	11,500	215802386
EA*5X37M21A	97VTN1002120A	16.0	12.5	8.0	11,500	215802387
EA*5X37M21A	97VTN1002122A	16.0	13.0	8.0	11,400	215802393
EA*5X37M21A	97VTN1002122A	16.0	13.0	8.0	11,400	215802394
EA*5X37M21A	97VTN1002122A	16.0	13.0	8.0	11,400	215802395
EVM5X31M17A	80MSU0601716A	16.0	12.0	7.8	11,200	214161397
EVM5X31M17A	80MSU0601716A	16.0	12.0	7.8	11,200	214161398
EVM5X31M17A	80MSU0601716A	16.0	12.0	7.8	11,200	214161399
EVM5X32M17A	92MSN0801716A	16.0	12.0	7.8	11,200	214161565
EVM5X32M17A	92MSN0801716A	16.0	12.0	7.8	11,200	214161566
EVM5X32M17A	92MSN0801716A	16.0	12.0	7.8	11,200	214161567
EVM5X32M17A	80MS(N,L)0901714A	16.0	12.0	7.8	11,200	214161445
EVM5X32M17A	80MS(N,L)0901714A	16.0	12.0	7.8	11,200	214161446
EVM5X32M17A	80MS(N,L)0901714A	16.0	12.0	7.8	11,200	214161447
EVM5X32M17A	80VSL0901716B	16.0	12.0	7.8	11,400	214161477
EVM5X32M17A	80VSL0901716B	16.0	12.0	7.8	11,400	214161478
EVM5X32M17A	80VSL0901716B	16.0	12.0	7.8	11,400	214161479
EVM5X32M17A	80MSU0601716A	16.0	12.5	7.8	11,300	214161501
EVM5X32M17A	80MSU0601716A	16.0	12.5	7.8	11,300	214161502
EVM5X32M17A	80MSU0601716A	16.0	12.5	7.8	11,300	214161503
EVD5X31M17A	80MSU0601716A	16.0	12.5	7.8	11,200	214161637
EVD5X31M17A	80MSU0601716A	16.0	12.5	7.8	11,200	214161638
EVD5X31M17A	80MSU0601716A	16.0	12.5	7.8	11,200	214161639
EVD5X37M21A	80MS(N,L)0902116A	16.0	12.0	7.8	11,200	214161669
EVD5X37M21A	80MS(N,L)0902116A	16.0	12.0	7.8	11,200	214161671
EVD5X37M21A	80MS(N,L)0902116A	16.0	12.0	7.8	11,200	214161670
EA*5X25M17A	80MSU0401712A	16.0	12.5	7.8	11,300	214160901
EA*5X25M17A	80MSU0401712A	16.0	12.5	7.8	11,300	214160902
EA*5X25M17A	80MSU0401712A	16.0	12.5	7.8	11,300	214160903
EA*5X25M17A	80MSU0601716A	16.0	12.0	7.8	11,200	214160909
EA*5X25M17A	80MSU0601716A	16.0	12.0	7.8	11,200	214160910
EA*5X25M17A	80MSU0601716A	16.0	12.0	7.8	11,200	214160911
EA*5X25M17A	80CTL0701412B	16.0	12.5	7.8	11,400	214160926
EA*5X25M17A	80CTL0701412B	16.0	12.5	7.8	11,400	214160925
EA*5X25M17A	80CTL0701412B	16.0	12.5	7.8	11,400	214160927
EVD5X38M17A	80VSL0701716B	16.0	12.0	7.8	11,300	214161861
EVD5X38M17A	80VSL0701716B	16.0	12.0	7.8	11,300	214161862
EVD5X38M17A	80VSL0701716B	16.0	12.0	7.8	11,300	214161863
EVD5X38M17A	80VSL0901716B	16.0	12.5	7.8	11,400	214161869
EVD5X38M17A	80VSL0901716B	16.0	12.5	7.8	11,400	214161870
EVD5X38M17A	80VSL0901716B	16.0	12.5	7.8	11,400	214161871
EVD5X38M17A	80MS(N,L)0701712A	16.0	12.5	7.8	11,400	214161821
EVD5X38M17A	80MS(N,L)0701712A	16.0	12.5	7.8	11,400	214161823
EVD5X38M17A	80MS(N,L)0701712A	16.0	12.5	7.8	11,400	214161822
EVD5X38M17A	80MS(N,L)0701716A	16.0	12.0	7.8	11,400	214161829
EVD5X38M17A	80MS(N,L)0701716A	16.0	12.0	7.8	11,400	214161830
EVD5X38M17A	80MS(N,L)0701716A	16.0	12.0	7.8	11,400	214161831
EVD5X38M17A	80MS(N,L)0901714A	16.0	12.5	7.8	11,200	214161838
EVD5X38M17A	80MS(N,L)0901714A	16.0	12.5	7.8	11,200	214161839
EVD5X38M17A	80MS(N,L)0901714A	16.0	12.5	7.8	11,200	214161837
EA*5X37M21A	80CSU0401712A	16.0	12.5	7.8	11,200	214160989
EA*5X37M21A	80CSU0401712A	16.0	12.5	7.8	11,200	214160990
EA*5X37M21A	80CSU0401712A	16.0	12.5	7.8	11,200	214160991
EA*5X37M21A	80CSU0802120A	16.0	12.5	7.8	11,300	214160997
EA*5X37M21A	80CSU0802120A	16.0	12.5	7.8	11,300	214160998
EA*5X37M21A	80CSU0802120A	16.0	12.5	7.8	11,300	214160999

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the Heil H5H6S24*K*AAA: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

Comfortmaker C5H6S24*K*AAA

Yearly running cost in 10 large cities$676-$1,705

Phoenix, AZ$819/yr
Miami, FL$676/yr
Houston, TX$734/yr
Atlanta, GA$723/yr
Los Angeles, CA$700/yr
New York, NY$1,705/yr
Chicago, IL$1,380/yr
Denver, CO$1,143/yr
Seattle, WA$700/yr
Minneapolis, MN$1,413/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 Heil H5H6S24*K*AAA?: The Heil H5H6S24*K*AAA is rated at up to 16.5 SEER2 and 13.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 579 certified matchups SEER2 ranges from 15.2-16.5.
Is the Heil H5H6S24*K*AAA good for cold climates?: It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 2-ton model.
How much does the Heil H5H6S24*K*AAA cost to run per year?: At its rated efficiency it costs about $676-$1,705 a year in electricity in large U.S. cities, depending on climate and local rates - for example $819 in Phoenix and $1,413 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Heil H5H6S24*K*AAA the same as the Comfortmaker C5H6S24*K*AAA?: 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 Heil H5H6S24*K*AAA?: ENERGY STAR lists 579 certified combinations for this outdoor unit. The highest-rated ones use FMA5X30**AL, EA*5X37M21A, EVM5X31M17A.
What refrigerant does the Heil H5H6S24*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 $806/yrYou save $402/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 Heil H5H6S24*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: $806
Current system, per year: $1,208
You save per year: $402
Payback: 22.4 years
Net after 10 years: -$4,980

Cooling $508Heating $298Electricity used: 5,035 kWhSaved vs. a minimum-efficiency heat pump: $118

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

Tempstar N5H5S24*K*AAA16.5 SEER2 · 8.5 HSPF2
Grandaire W5H5S24*K*AAA16.5 SEER2 · 8.5 HSPF2
Tempstar T5H6S24*K*AAA16.5 SEER2 · 8.5 HSPF2
Carrier GH5SAN524**AA16.5 SEER2 · 8.5 HSPF2
WeatherMaker PH5SAN524**AB16.5 SEER2 · 8.5 HSPF2
Carrier 27SCA524A**3016.5 SEER2 · 8.5 HSPF2
Samsung AC024FCUDCG · cold climate16.5 SEER2 · 8.2 HSPF2
Bryant PH5SAN524**AA16.5 SEER2 · 8.5 HSPF2

See all 331 2 ton central heat pumps, ranked

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