What is the SEER2 rating of the Heil N5H8T36*K*AAA?

The Heil N5H8T36*K*AAA is rated at up to 17.0 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 2449 certified matchups SEER2 ranges from 15.2-17.0.

Is the Heil N5H8T36*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 N5H8T36*K*AAA cost to run per year?

At its rated efficiency it costs about $992-$2,820 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,246 in Phoenix and $2,374 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 Heil N5H8T36*K*AAA?

ENERGY STAR lists 2449 certified combinations for this outdoor unit. The highest-rated ones use FTMA5B60L0D, FTMA5B48L0C, QFVA5D4821X.

3-ton central heat pump · 2-STAGE 18 SEER HP

Heil N5H8T36KAAA

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

Ranks #166 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,163 a year to run in a mixed climate like Atlanta.

SEER2: 17.0 Cooling efficiency over a season
Average · beats 49%
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: 19,600 BTU/h49% of its 47°F output
Excellent · beats 98%

A good fit if…

You want a choice of indoor units - 2,449 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.

Calculate my running cost

Details

Specifications3 ton, R-454B

General
Brand	Heil
Also sold as	Airquest, Arcoaire, Comfortmaker, Day & Night, Keeprite, Tempstar, Kenmore, ACIQ, MARATHERM
Outdoor unit model	N5H8T36KAAA
Series	2-STAGE 18 SEER HP
Type	Central heat pump
Nominal size	3 ton
CompressorVariable-speed units run longer at low power	Two-stage
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	November 4, 2024
Last certified	October 7, 2026
Cooling
SEER2Seasonal efficiency, higher is better	17.0 (range 15.2-17.0)
EER2Efficiency at 95°F outdoors	11.7-13.0
Cooling capacity	33,800-38,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.5
Capacity at 47°F	37,200-39,000 BTU/h
Capacity at 17°F	23,000-24,200 BTU/h
Capacity at 5°F	17,500-19,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.78-2.48
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 FTMA5B60L0D at the standard test temperatures, in BTU/h:

Certified matchups2,449 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 2,449 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.
FTMA5B60L0D	-	17.0	13.0	8.5	18,600	215628950
FTMA5B60L0D	-	17.0	13.0	8.5	18,600	215628951
FTMA5B60L0D	-	17.0	13.0	8.5	18,600	215628952
FTMA5B60L0D	-	17.0	13.0	8.5	18,600	215628953
FTMA5B60L0D	-	17.0	13.0	8.5	18,600	215628954
FTMA5B60L0D	-	17.0	13.0	8.5	18,600	215628955
FTMA5B60L0D	-	17.0	13.0	8.5	18,600	215628958
FTMA5B60L0D	-	17.0	13.0	8.5	18,600	215628957
FTMA5B60L0D	-	17.0	13.0	8.5	18,600	215628956
FTMA5B60L0D	-	17.0	13.0	8.5	18,600	216631656
FTMA5B48L0C	-	16.5	12.5	8.1	18,700	215628896
FTMA5B48L0C	-	16.5	12.5	8.1	18,700	215628899
FTMA5B48L0C	-	16.5	12.5	8.1	18,700	215628898
FTMA5B48L0C	-	16.5	12.5	8.1	18,700	215628897
FTMA5B48L0C	-	16.5	12.5	8.1	18,700	215628900
FTMA5B48L0C	-	16.5	12.5	8.1	18,700	215628901
FTMA5B48L0C	-	16.5	12.5	8.1	18,700	215628902
FTMA5B48L0C	-	16.5	12.5	8.1	18,700	215628903
FTMA5B48L0C	-	16.5	12.5	8.1	18,700	215628904
FTMA5B48L0C	-	16.5	12.5	8.1	18,700	216631654
QFVA5D4821X	-	16.5	13.0	8.1	18,400	218695419
QFVA5D4821X	-	16.5	13.0	8.1	18,400	218695418
QFVA5D4821X	-	16.5	13.0	8.1	18,400	218695417
QFVA5D4821X	-	16.5	13.0	8.1	18,400	218695416
QFVA5D4821X	-	16.5	13.0	8.1	18,400	218695415
QFVA5D4821X	-	16.5	13.0	8.1	18,400	218695414
QFVA5D4821X	-	16.5	13.0	8.1	18,400	218695413
QFVA5D4821X	-	16.5	13.0	8.1	18,400	218695412
QFVA5D4821X	-	16.5	13.0	8.1	18,400	218822088
EA*5X43M21A	80MSU0802120A	16.0	12.0	8.5	19,100	215637797
EA*5X43M21A	80MSU0802120A	16.0	12.0	8.5	19,100	215637801
EA*5X43M21A	80MSU0802120A	16.0	12.0	8.5	19,100	215637798
EA*5X43M21A	80MSU0802120A	16.0	12.0	8.5	19,100	215637799
EA*5X43M21A	80MSU0802120A	16.0	12.0	8.5	19,100	215637803
EA*5X43M21A	80MSU0802120A	16.0	12.0	8.5	19,100	215637806
EA*5X43M21A	80MSU0802120A	16.0	12.0	8.5	19,100	215637804
EA*5X43M21A	80MSU0802120A	16.0	12.0	8.5	19,100	215637807
EA*5X43M21A	80MSU0802120A	16.0	12.0	8.5	19,100	215637809
EA*5X43M21A	80MSU0802120A	16.0	12.0	8.5	19,100	216632183
EA*5X37M21A	97VTN1002122A	16.0	12.0	8.5	19,200	215714851
EA*5X37M21A	97VTN1002122A	16.0	12.0	8.5	19,200	215714852
EA*5X37M21A	97VTN1002122A	16.0	12.0	8.5	19,200	215714853
EA*5X37M21A	97VTN1002122A	16.0	12.0	8.5	19,200	215714854
EA*5X37M21A	97VTN1002122A	16.0	12.0	8.5	19,200	215714855
EA*5X37M21A	97VTN1002122A	16.0	12.0	8.5	19,200	215714856
EA*5X37M21A	97VTN1002122A	16.0	12.0	8.5	19,200	215714857
EA*5X37M21A	97VTN1002122A	16.0	12.0	8.5	19,200	215714858
EA*5X37M21A	80VSL1102122B	16.0	12.0	8.1	19,400	215635687
EA*5X37M21A	80VSL1102122B	16.0	12.0	8.1	19,400	215635689
EA*5X37M21A	80VSL1102122B	16.0	12.0	8.1	19,400	215635688
EA*5X37M21A	80VSL1102122B	16.0	12.0	8.1	19,400	215635693
EA*5X37M21A	80VSL1102122B	16.0	12.0	8.1	19,400	215635692
EA*5X37M21A	80VSL1102122B	16.0	12.0	8.1	19,400	215635690
EA*5X37M21A	80VSL1102122B	16.0	12.0	8.1	19,400	215635691
EA*5X37M21A	80VSL1102122B	16.0	12.0	8.1	19,400	215635694
EA*5X37M21A	80MSU0601716A	16.0	12.0	8.1	19,300	215635720
EA*5X37M21A	80MSU0601716A	16.0	12.0	8.1	19,300	215635722
EA*5X37M21A	80MSU0601716A	16.0	12.0	8.1	19,300	215635726
EA*5X37M21A	80MSU0601716A	16.0	12.0	8.1	19,300	215635723
EA*5X37M21A	80MSU0601716A	16.0	12.0	8.1	19,300	215635727

Yearly running cost in 10 large cities$992-$2,820

Phoenix, AZ$1,246/yr
Miami, FL$992/yr
Houston, TX$1,118/yr
Atlanta, GA$1,163/yr
Los Angeles, CA$1,139/yr
New York, NY$2,820/yr
Chicago, IL$2,297/yr
Denver, CO$1,916/yr
Seattle, WA$1,182/yr
Minneapolis, MN$2,374/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 Heil N5H8T36*K*AAA?: The Heil N5H8T36*K*AAA is rated at up to 17.0 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 2449 certified matchups SEER2 ranges from 15.2-17.0.
Is the Heil N5H8T36*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 N5H8T36*K*AAA cost to run per year?: At its rated efficiency it costs about $992-$2,820 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,246 in Phoenix and $2,374 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 Heil N5H8T36*K*AAA?: ENERGY STAR lists 2449 certified combinations for this outdoor unit. The highest-rated ones use FTMA5B60L0D, FTMA5B48L0C, QFVA5D4821X.
What refrigerant does the Heil N5H8T36*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 $1,249/yrYou save $642/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 N5H8T36*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: $1,249
Current system, per year: $1,890
You save per year: $642
Payback: 21.0 years
Net after 10 years: -$7,084

Cooling $741Heating $507Electricity used: 7,804 kWhSaved vs. a minimum-efficiency heat pump: $208

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

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Friedrich RD16AY36AJVC · cold climate17.0 SEER2 · 8.5 HSPF2
WeatherMaker PH8TAN536**AB17.0 SEER2 · 8.5 HSPF2
Carrier GH8TAN536**AA17.0 SEER2 · 8.5 HSPF2
York YH636E2S1117.0 SEER2 · 8.5 HSPF2
Carrier 27TPA836A**3017.0 SEER2 · 8.5 HSPF2
Samsung AC036BXUDCH · cold climate17.0 SEER2 · 8.1 HSPF2

See all 302 3 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of October 7, 2026. How we use the data.