What is the SEER2 rating of the Heil H5H6S36*K*AAA?

The Heil H5H6S36*K*AAA is rated at up to 15.5 SEER2 and 13.0 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 90 certified matchups SEER2 ranges from 15.2-15.5.

Is the Heil H5H6S36*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 3-ton model.

How much does the Heil H5H6S36*K*AAA cost to run per year?

At its rated efficiency it costs about $1,061-$2,835 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,308 in Phoenix and $2,368 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Heil H5H6S36*K*AAA the same as the Comfortmaker C5H6S36*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 H5H6S36*K*AAA?

ENERGY STAR lists 90 certified combinations for this outdoor unit. The highest-rated ones use FHMA5*48L*C, FTMA5B48L0C, FEVB0048**+NAVA54801CK.

3-ton central heat pump · MAINLINE 16 SEER2 HP

Heil H5H6S36KAAA

Below average cooling and heating efficiency for a 3-ton central heat pump, but not rated for cold climates.

Ranks #268 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,186 a year to run in a mixed climate like Atlanta.

SEER2: 15.5 Cooling efficiency over a season
Below average · beats 15%
HSPF2: 7.8 Heating efficiency over a season
Below average · beats 5%
EER2: 13.0 Cooling efficiency on a 95°F day
Very good · beats 89%
Heat at 5°F: 18,100 BTU/h50% of its 47°F output
Very good · beats 81%

A good fit if…

You want a choice of indoor units - 90 certified pairings.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
Cooling cost matters most - its SEER2 is below average for central heat pumps.
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

Specifications3 ton, R-454B

General
Brand	Heil
Also sold as	Airquest, Arcoaire, Comfortmaker, Day & Night, Keeprite
Outdoor unit model	H5H6S36KAAA
Series	MAINLINE 16 SEER2 HP
Type	Central heat pump
Nominal size	3 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 21, 2026
Cooling
SEER2Seasonal efficiency, higher is better	15.5 (range 15.2-15.5)
EER2Efficiency at 95°F outdoors	11.7-13.0
Cooling capacity	33,800-36,800 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8
Capacity at 47°F	33,200-36,200 BTU/h
Capacity at 17°F	21,000-22,800 BTU/h
Capacity at 5°F	16,700-18,100 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.00-2.24
ENERGY STAR cold climate	No

Heating output as it gets colder50% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with FHMA5*48L*C at the standard test temperatures, in BTU/h:

Certified matchups90 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 90 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.
FHMA548LC	-	15.5	13.0	7.8	17,500	214165318
FHMA548LC	-	15.5	13.0	7.8	17,500	214165317
FHMA548LC	-	15.5	13.0	7.8	17,500	214165319
FTMA5B48L0C	-	15.5	12.5	7.8	16,700	214165261
FTMA5B48L0C	-	15.5	12.5	7.8	16,700	214165262
FTMA5B48L0C	-	15.5	12.5	7.8	16,700	214165263
FEVB0048**+NAVA54801CK	-	15.5	12.5	7.8	17,400	214277697
FEVB0048**+NAVA54801CK	-	15.5	12.5	7.8	17,400	214277698
FEVB0048**+NAVA54801CK	-	15.5	12.5	7.8	17,400	214277699
FMA5X36**AL	-	15.5	12.5	7.8	17,000	214424323
FMA5X36**AL	-	15.5	12.5	7.8	17,000	214424324
FMA5X36**AL	-	15.5	12.5	7.8	17,000	214424325
F5MA548LC	-	15.5	13.0	7.8	17,500	216464038
F5MA548LC	-	15.5	13.0	7.8	17,500	216464039
F5MA548LC	-	15.5	13.0	7.8	17,500	216464040
FEVA0048**+NAVA54801CK	-	15.5	12.5	7.8	17,400	217051671
FEVA0048**+NAVA54801CK	-	15.5	12.5	7.8	17,400	217051672
FEVA0048**+NAVA54801CK	-	15.5	12.5	7.8	17,400	217051673
EVD5X42M24A	80MSU1002120A	15.2	12.0	7.8	18,100	214155651
EVD5X42M24A	80MSU1002120A	15.2	12.0	7.8	18,100	214155652
EVD5X42M24A	80MSU1002120A	15.2	12.0	7.8	18,100	214155653
EA*5X43M21A	80CSU0601716A	15.2	12.0	7.8	17,000	214154320
EA*5X43M21A	80CSU0601716A	15.2	12.0	7.8	17,000	214154321
EA*5X43M21A	80CSU0601716A	15.2	12.0	7.8	17,000	214154322
EA*5X43M21A	80CSU1002120A	15.2	12.0	7.8	17,600	214154328
EA*5X43M21A	80CSU1002120A	15.2	12.0	7.8	17,600	214154329
EA*5X43M21A	80CSU1002120A	15.2	12.0	7.8	17,600	214154330
EA*5X48M21A	80MSU0601716A	15.2	12.0	7.8	17,600	214154835
EA*5X48M21A	80MSU0601716A	15.2	12.0	7.8	17,600	214154836
EA*5X48M21A	80MSU0601716A	15.2	12.0	7.8	17,600	214154837
EA*5X48M21A	80MSU0802120A	15.2	12.0	7.8	17,300	214154843
EA*5X48M21A	80MSU0802120A	15.2	12.0	7.8	17,300	214154844
EA*5X48M21A	80MSU0802120A	15.2	12.0	7.8	17,300	214154845
EA*5X37M21A	80CSU0601716A	15.2	12.0	7.8	17,100	214153848
EA*5X37M21A	80CSU0601716A	15.2	12.0	7.8	17,100	214153849
EA*5X37M21A	80CSU0601716A	15.2	12.0	7.8	17,100	214153850
EA*5X48M21A	80MS(N,L)0902120A	15.2	12.0	7.8	17,500	214154755
EA*5X48M21A	80MS(N,L)0902120A	15.2	12.0	7.8	17,500	214154756
EA*5X48M21A	80MS(N,L)0902120A	15.2	12.0	7.8	17,500	214154757
EA*5X48M21A	80MS(N,L)1102120A	15.2	12.0	7.8	17,600	214154763
EA*5X48M21A	80MS(N,L)1102120A	15.2	12.0	7.8	17,600	214154764
EA*5X48M21A	80MS(N,L)1102120A	15.2	12.0	7.8	17,600	214154765
EA*5X48M21A	80VSL0902120B	15.2	12.0	7.8	17,500	214154787
EA*5X48M21A	80VSL0902120B	15.2	12.0	7.8	17,500	214154788
EA*5X48M21A	80VSL0902120B	15.2	12.0	7.8	17,500	214154789
EA*5X43M21A	80MS(N,L)0902120A	15.2	12.0	7.8	17,900	214154368
EA*5X43M21A	80MS(N,L)0902120A	15.2	12.0	7.8	17,900	214154369
EA*5X43M21A	80MS(N,L)0902120A	15.2	12.0	7.8	17,900	214154370
EA*5X43M21A	80MS(N,L)1102120A	15.2	12.0	7.8	18,000	214154378
EA*5X43M21A	80MS(N,L)1102120A	15.2	12.0	7.8	18,000	214154376
EA*5X43M21A	80MS(N,L)1102120A	15.2	12.0	7.8	18,000	214154377
EA*5X48M21A	80CTL1102120B	15.2	12.0	7.8	17,500	214154891
EA*5X48M21A	80CTL1102120B	15.2	12.0	7.8	17,500	214154892
EA*5X48M21A	80CTL1102120B	15.2	12.0	7.8	17,500	214154893
EA*5X48M21A	80VTL0902120B	15.2	12.0	7.8	17,500	214154915
EA*5X48M21A	80VTL0902120B	15.2	12.0	7.8	17,500	214154916
EA*5X48M21A	80VTL0902120B	15.2	12.0	7.8	17,500	214154917
EA*5X48M21A	92MSN1002120A	15.2	12.0	7.8	17,600	214155003
EA*5X48M21A	92MSN1002120A	15.2	12.0	7.8	17,600	214155004
EA*5X48M21A	92MSN1002120A	15.2	12.0	7.8	17,600	214155005

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the Heil H5H6S36*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 C5H6S36*K*AAA

Yearly running cost in 10 large cities$1,061-$2,835

Phoenix, AZ$1,308/yr
Miami, FL$1,061/yr
Houston, TX$1,172/yr
Atlanta, GA$1,186/yr
Los Angeles, CA$1,154/yr
New York, NY$2,835/yr
Chicago, IL$2,302/yr
Denver, CO$1,914/yr
Seattle, WA$1,176/yr
Minneapolis, MN$2,368/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 H5H6S36*K*AAA?: The Heil H5H6S36*K*AAA is rated at up to 15.5 SEER2 and 13.0 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 90 certified matchups SEER2 ranges from 15.2-15.5.
Is the Heil H5H6S36*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 3-ton model.
How much does the Heil H5H6S36*K*AAA cost to run per year?: At its rated efficiency it costs about $1,061-$2,835 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,308 in Phoenix and $2,368 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Heil H5H6S36*K*AAA the same as the Comfortmaker C5H6S36*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 H5H6S36*K*AAA?: ENERGY STAR lists 90 certified combinations for this outdoor unit. The highest-rated ones use FHMA5*48L*C, FTMA5B48L0C, FEVB0048**+NAVA54801CK.
What refrigerant does the Heil H5H6S36*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 $1,297/yrYou save $507/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 H5H6S36*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: $1,297
Current system, per year: $1,805
You save per year: $507
Payback: 25.6 years
Net after 10 years: -$7,927

Cooling $795Heating $503Electricity used: 8,109 kWhSaved vs. a minimum-efficiency heat pump: $87

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 ton models

LPS Legacy N4H5S36*K*AAA15.5 SEER2 · 7.8 HSPF2
Bryant PH5SAN436**AA15.5 SEER2 · 7.8 HSPF2
Tempstar T5H6S36*K*AAA15.5 SEER2 · 7.8 HSPF2
Bryant 227TAN036**AA15.5 SEER2 · 7.8 HSPF2
AC Pro SPHP-Z-V037BB · cold climate15.4 SEER2 · 9.8 HSPF2
Kepler AZPN/36WAC · cold climate15.5 SEER2 · 8.6 HSPF2
MOOVAIR MSHMB36R2AN · cold climate15.3 SEER2 · 9.6 HSPF2
KERR A-KXP36TA-1 · cold climate15.8 SEER2 · 9.4 HSPF2

See all 302 3 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 21, 2026. How we use the data.