What is the SEER2 rating of the Heil N5H8T24*K*AAA?

The Heil N5H8T24*K*AAA is rated at up to 18.5 SEER2 and 14.0 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 4839 certified matchups SEER2 ranges from 15.2-18.5.

Is the Heil N5H8T24*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 N5H8T24*K*AAA cost to run per year?

At its rated efficiency it costs about $587-$1,777 a year in electricity in large U.S. cities, depending on climate and local rates - for example $753 in Phoenix and $1,507 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 N5H8T24*K*AAA?

ENERGY STAR lists 4839 certified combinations for this outdoor unit. The highest-rated ones use EVD5X38M17A, EVM5X32M17A, EA*5X25M17A.

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

Heil N5H8T24KAAA

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

Ranks #103 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: 18.5 Cooling efficiency over a season
Very good · beats 77%
HSPF2: 8.5 Heating efficiency over a season
Below average · beats 38%
EER2: 14.0 Cooling efficiency on a 95°F day
Excellent · beats 98%
Heat at 5°F: 11,500 BTU/h45% of its 47°F output
Very good · beats 81%

A good fit if…

You want low cooling bills - its SEER2 beats 77% of central heat pumps.
You want a choice of indoor units - 4,839 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

Specifications2 ton, R-454B

General
Brand	Heil
Also sold as	Airquest, Arcoaire, Comfortmaker, Day & Night, Keeprite, Tempstar, Kenmore, ACIQ, MARATHERM
Outdoor unit model	N5H8T24KAAA
Series	2-STAGE 18 SEER HP
Type	Central heat pump
Nominal size	2 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	18.5 (range 15.2-18.5)
EER2Efficiency at 95°F outdoors	11.5-14.0
Cooling capacity	22,200-25,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.5
Capacity at 47°F	24,000-25,400 BTU/h
Capacity at 17°F	14,100-15,000 BTU/h
Capacity at 5°F	10,700-11,500 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.90-2.24
ENERGY STAR cold climate	No

Heating output as it gets colder45% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with EVD5X38M17A at the standard test temperatures, in BTU/h:

Certified matchups4,839 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 4,839 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.
EVD5X38M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215618611
EVD5X38M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215618612
EVD5X38M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215618615
EVD5X38M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215618614
EVD5X38M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215618613
EVD5X38M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215618616
EVD5X38M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215618617
EVD5X38M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215618619
EVD5X38M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215618618
EVM5X32M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215614349
EVM5X32M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215614350
EVM5X32M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215614351
EVM5X32M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215614353
EVM5X32M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215614352
EVM5X32M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215614354
EVM5X32M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215614356
EVM5X32M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215614355
EVM5X32M17A	80CSU0401712A	18.5	14.0	7.8	11,000	215614357
EVM5X32M17A	80VSL0701412B	18.5	14.0	7.8	10,900	215614377
EVM5X32M17A	80VSL0701412B	18.5	14.0	7.8	10,900	215614376
EVM5X32M17A	80VSL0701412B	18.5	14.0	7.8	10,900	215614379
EVM5X32M17A	80VSL0701412B	18.5	14.0	7.8	10,900	215614380
EVM5X32M17A	80VSL0701412B	18.5	14.0	7.8	10,900	215614378
EVM5X32M17A	80VSL0701412B	18.5	14.0	7.8	10,900	215614381
EVM5X32M17A	80VSL0701412B	18.5	14.0	7.8	10,900	215614383
EVM5X32M17A	80VSL0701412B	18.5	14.0	7.8	10,900	215614382
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	215614419
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	215614420
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	215614418
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	215614421
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	215614423
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	215614422
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	215614425
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	215614424
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	215614426
EVM5X32M17A	80CSU0401712A	18.5	14.0	7.8	11,000	216630724
EVM5X32M17A	80VSL0701412B	18.5	14.0	7.8	10,900	216630726
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	216630729
EVD5X38M17A	80CSU0401712A	18.5	14.0	7.8	11,000	216630996
EA*5X25M17A	80CSU0401712A	18.0	13.0	8.5	11,300	215644367
EA*5X25M17A	80CSU0401712A	18.0	13.0	8.5	11,300	215644368
EA*5X25M17A	80CSU0401712A	18.0	13.0	8.5	11,300	215644370
EA*5X25M17A	80CSU0401712A	18.0	13.0	8.5	11,300	215644378
EA*5X25M17A	80CSU0401712A	18.0	13.0	8.5	11,300	215644374
EA*5X25M17A	80CSU0401712A	18.0	13.0	8.5	11,300	215644376
EA*5X25M17A	80CSU0401712A	18.0	13.0	8.5	11,300	215644373
EA*5X25M17A	80CSU0401712A	18.0	13.0	8.5	11,300	215644377
EA*5X25M17A	80CSU0401712A	18.0	13.0	8.5	11,300	215644371
EA*5X37M21A	80CSU0401712A	18.0	13.0	8.5	11,300	215647763
EA*5X37M21A	80CSU0401712A	18.0	13.0	8.5	11,300	215647756
EA*5X37M21A	80CSU0401712A	18.0	13.0	8.5	11,300	215647754
EA*5X37M21A	80CSU0401712A	18.0	13.0	8.5	11,300	215647760
EA*5X37M21A	80CSU0401712A	18.0	13.0	8.5	11,300	215647759
EA*5X37M21A	80CSU0401712A	18.0	13.0	8.5	11,300	215647753
EA*5X37M21A	80CSU0401712A	18.0	13.0	8.5	11,300	215647762
EA*5X37M21A	80CSU0401712A	18.0	13.0	8.5	11,300	215647757
EA*5X37M21A	80CSU0401712A	18.0	13.0	8.5	11,300	215647764
EA*5X37M21A	80VSL1102122B	18.0	13.0	8.5	11,100	215647833
EA*5X37M21A	80VSL1102122B	18.0	13.0	8.5	11,100	215647832
EA*5X37M21A	80VSL1102122B	18.0	13.0	8.5	11,100	215647835

Yearly running cost in 10 large cities$587-$1,777

Phoenix, AZ$753/yr
Miami, FL$587/yr
Houston, TX$676/yr
Atlanta, GA$723/yr
Los Angeles, CA$713/yr
New York, NY$1,777/yr
Chicago, IL$1,452/yr
Denver, CO$1,215/yr
Seattle, WA$752/yr
Minneapolis, MN$1,507/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 N5H8T24*K*AAA?: The Heil N5H8T24*K*AAA is rated at up to 18.5 SEER2 and 14.0 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 4839 certified matchups SEER2 ranges from 15.2-18.5.
Is the Heil N5H8T24*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 N5H8T24*K*AAA cost to run per year?: At its rated efficiency it costs about $587-$1,777 a year in electricity in large U.S. cities, depending on climate and local rates - for example $753 in Phoenix and $1,507 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 N5H8T24*K*AAA?: ENERGY STAR lists 4839 certified combinations for this outdoor unit. The highest-rated ones use EVD5X38M17A, EVM5X32M17A, EA*5X25M17A.
What refrigerant does the Heil N5H8T24*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 $762/yrYou save $450/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 N5H8T24*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: $762
Current system, per year: $1,212
You save per year: $450
Payback: 18.9 years
Net after 10 years: -$3,996

Cooling $438Heating $324Electricity used: 4,761 kWhSaved vs. a minimum-efficiency heat pump: $172

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

Kenmore (C,H,T)5H8T24*K*AAA18.5 SEER2 · 8.5 HSPF2
Carrier GH8TAN524**AA18.5 SEER2 · 8.5 HSPF2
Tempstar T5H8T24*K*AAA18.5 SEER2 · 8.5 HSPF2
Carrier 27TPA824A**3018.5 SEER2 · 8.5 HSPF2
WeatherMaker PH8TAN524**AB18.5 SEER2 · 8.5 HSPF2
Bryant PH8TAN524**AA18.5 SEER2 · 8.5 HSPF2
Kinghome KD24UXO18.5 SEER2 · 8.3 HSPF2
Bryant 248TAN024**AA18.5 SEER2 · 8.5 HSPF2

See all 331 2 ton central heat pumps, ranked

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