What is the SEER2 rating of the Heil N5H5S42*K*AAA?

The Heil N5H5S42*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 43 certified matchups SEER2 ranges from 15.2-15.5.

Is the Heil N5H5S42*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 3.5-ton model.

How much does the Heil N5H5S42*K*AAA cost to run per year?

At its rated efficiency it costs about $1,286-$3,312 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,568 in Phoenix and $2,753 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Heil N5H5S42*K*AAA the same as the Heil R5H5S42*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 N5H5S42*K*AAA?

ENERGY STAR lists 43 certified combinations for this outdoor unit. The highest-rated ones use FTMA5B60L0D, FHMA5*60L*D, FEVB0060**+NAVA56001CK.

3.5-ton central heat pump · PERFORMANCE 16 SEER2 HP

Heil N5H5S42KAAA

Below average cooling and heating efficiency for a 3.5-ton central heat pump, but not rated for cold climates.

Ranks #108 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,398 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: 19,900 BTU/h49% of its 47°F output
Very good · beats 83%

A good fit if…

You want a choice of indoor units - 43 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

Specifications3.5 ton, R-454B

General
Brand	Heil
Also sold as	Airquest, Arcoaire, Comfortmaker, Day & Night, Keeprite, MARATHERM, Smart Comfort, Tempstar, Kenmore, ACIQ
Outdoor unit model	N5H5S42KAAA
Series	PERFORMANCE 16 SEER2 HP
Type	Central heat pump
Nominal size	3.5 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	June 29, 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	41,500-43,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8
Capacity at 47°F	39,000-40,500 BTU/h
Capacity at 17°F	24,600-25,600 BTU/h
Capacity at 5°F	19,000-19,900 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.20-2.26
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 FTMA5B60L0D at the standard test temperatures, in BTU/h:

Certified matchups43 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.
FTMA5B60L0D	15.5	13.0	7.8	19,000	214180050
FTMA5B60L0D	15.5	13.0	7.8	19,000	214180052
FTMA5B60L0D	15.5	13.0	7.8	19,000	214180054
FTMA5B60L0D	15.5	13.0	7.8	19,000	214180056
FTMA5B60L0D	15.5	13.0	7.8	19,000	214180058
FTMA5B60L0D	15.5	13.0	7.8	19,000	214180060
FTMA5B60L0D	15.5	13.0	7.8	19,000	214180068
FTMA5B60L0D	15.5	13.0	7.8	19,000	214180062
FTMA5B60L0D	15.5	13.0	7.8	19,000	214180064
FTMA5B60L0D	15.5	13.0	7.8	19,000	214180066
FTMA5B60L0D	15.5	13.0	7.8	19,000	216629133
FHMA560LD	15.2	11.7	7.8	19,900	214180008
FHMA560LD	15.2	11.7	7.8	19,900	214180010
FHMA560LD	15.2	11.7	7.8	19,900	214180012
FHMA560LD	15.2	11.7	7.8	19,900	214180014
FHMA560LD	15.2	11.7	7.8	19,900	214180016
FHMA560LD	15.2	11.7	7.8	19,900	214180018
FHMA560LD	15.2	11.7	7.8	19,900	214180020
FHMA560LD	15.2	11.7	7.8	19,900	214180022
FHMA560LD	15.2	11.7	7.8	19,900	214180024
FHMA560LD	15.2	11.7	7.8	19,900	214180026
FEVB0060**+NAVA56001CK	15.2	12.5	7.8	19,800	214179586
FEVB0060**+NAVA56001CK	15.2	12.5	7.8	19,800	214277427
FEVB0060**+NAVA56001CK	15.2	12.5	7.8	19,800	214277430
FEVB0060**+NAVA56001CK	15.2	12.5	7.8	19,800	214277433
FEVB0060**+NAVA56001CK	15.2	12.5	7.8	19,800	214277436
FEVB0060**+NAVA56001CK	15.2	12.5	7.8	19,800	214277438
FEVB0060**+NAVA56001CK	15.2	12.5	7.8	19,800	214277443
FEVB0060**+NAVA56001CK	15.2	12.5	7.8	19,800	214277446
FEVB0060**+NAVA56001CK	15.2	12.5	7.8	19,800	214277448
FEVB0060**+NAVA56001CK	15.2	12.5	7.8	19,800	214277451
F5MA560LD	15.2	11.7	7.8	19,900	216464107
F5MA560LD	15.2	11.7	7.8	19,900	216464109
F5MA560LD	15.2	11.7	7.8	19,900	216464111
F5MA560LD	15.2	11.7	7.8	19,900	216464113
F5MA560LD	15.2	11.7	7.8	19,900	216464115
F5MA560LD	15.2	11.7	7.8	19,900	216464117
F5MA560LD	15.2	11.7	7.8	19,900	216464119
F5MA560LD	15.2	11.7	7.8	19,900	216464121
F5MA560LD	15.2	11.7	7.8	19,900	216464123
F5MA560LD	15.2	11.7	7.8	19,900	216464125
F5MA560LD	15.2	11.7	7.8	19,900	216629131
FHMA560LD	15.2	11.7	7.8	19,900	217738921

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the Heil N5H5S42*K*AAA: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

Heil R5H5S42*K*AAA

Yearly running cost in 10 large cities$1,286-$3,312

Phoenix, AZ$1,568/yr
Miami, FL$1,286/yr
Houston, TX$1,405/yr
Atlanta, GA$1,398/yr
Los Angeles, CA$1,355/yr
New York, NY$3,312/yr
Chicago, IL$2,683/yr
Denver, CO$2,226/yr
Seattle, WA$1,364/yr
Minneapolis, MN$2,753/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 N5H5S42*K*AAA?: The Heil N5H5S42*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 43 certified matchups SEER2 ranges from 15.2-15.5.
Is the Heil N5H5S42*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 3.5-ton model.
How much does the Heil N5H5S42*K*AAA cost to run per year?: At its rated efficiency it costs about $1,286-$3,312 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,568 in Phoenix and $2,753 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Heil N5H5S42*K*AAA the same as the Heil R5H5S42*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 N5H5S42*K*AAA?: ENERGY STAR lists 43 certified combinations for this outdoor unit. The highest-rated ones use FTMA5B60L0D, FHMA5*60L*D, FEVB0060**+NAVA56001CK.
What refrigerant does the Heil N5H5S42*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 $1,547/yrYou save $612/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 N5H5S42*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: $1,547
Current system, per year: $2,159
You save per year: $612
Payback: 26.1 years
Net after 10 years: -$9,880

Cooling $965Heating $582Electricity used: 9,667 kWhSaved vs. a minimum-efficiency heat pump: $104

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 3.5 ton models

ECOTEMP W5H5S42*K*AAA15.5 SEER2 · 7.8 HSPF2
Kenmore B5H6S42*K*AAA15.5 SEER2 · 7.8 HSPF2
Carrier 27SCA542A**3015.5 SEER2 · 7.8 HSPF2
Tempstar T5H6S42*K*AAA15.5 SEER2 · 7.8 HSPF2
Bryant PH5SAN542**AA15.5 SEER2 · 7.8 HSPF2
MRCOOL MHP17042A-**A15.4 SEER2 · 7.8 HSPF2
Bryant GH5SAN542**AA15.5 SEER2 · 7.8 HSPF2
Kepler AZPN/45WD · cold climate15.2 SEER2 · 9.2 HSPF2

See all 138 3.5 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 29, 2026. How we use the data.