What is the SEER2 rating of the Arcoaire H4H5S36*K*AAA?

The Arcoaire H4H5S36*K*AAA is rated at up to 15.2 SEER2 and 12.5 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the Arcoaire H4H5S36*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 Arcoaire H4H5S36*K*AAA cost to run per year?

At its rated efficiency it costs about $1,099-$2,855 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,343 in Phoenix and $2,376 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 Arcoaire H4H5S36*K*AAA?

ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use EA*4X43L21A, EA*4X37L21A.

What refrigerant does the Arcoaire H4H5S36*K*AAA use?

It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

3-ton central heat pump · MAINLINE 15 SEER2 HP

Arcoaire H4H5S36KAAA

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

Ranks #286 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,203 a year to run in a mixed climate like Atlanta.

SEER2: 15.2 Cooling efficiency over a season
Below average · beats 6%
HSPF2: 7.8 Heating efficiency over a season
Below average · beats 5%
EER2: 12.5 Cooling efficiency on a 95°F day
Very good · beats 80%
Heat at 5°F: 16,500 BTU/h46% of its 47°F output
Average · beats 58%

A good fit if…

You want a choice of indoor units - 12 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.
You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications3 ton, R-410A

General
Brand	Arcoaire
Also sold as	Heil, Airquest
Outdoor unit model	H4H5S36KAAA
Series	MAINLINE 15 SEER2 HP
Type	Central heat pump
Nominal size	3 ton
CompressorVariable-speed units run longer at low power	Single stage
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	July 13, 2023
Last certified	January 27, 2025
Cooling
SEER2Seasonal efficiency, higher is better	15.2 (range 15.2)
EER2Efficiency at 95°F outdoors	12.0-12.5
Cooling capacity	34,800-35,600 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8
Capacity at 47°F	34,200-35,400 BTU/h
Capacity at 17°F	20,400-21,200 BTU/h
Capacity at 5°F	15,800-16,500 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.10
ENERGY STAR cold climate	No

Heating output as it gets colder46% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with EA*4X43L21A at the standard test temperatures, in BTU/h:

Certified matchups12 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. 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.
EA*4X43L21A	80ES(N,L)0902120A	15.2	12.5	7.8	15,800	210316806
EA*4X43L21A	80ES(N,L)0902120A	15.2	12.5	7.8	15,800	210316815
EA*4X43L21A	80ES(N,L)0902120A	15.2	12.5	7.8	15,800	210316803
EA*4X37L21A	80ES(N,L)0902120A	15.2	12.0	7.8	15,800	210313440
EA*4X37L21A	80ES(N,L)0902120A	15.2	12.0	7.8	15,800	210313449
EA*4X37L21A	80ES(N,L)0902120A	15.2	12.0	7.8	15,800	210313437
EA*4X37L21A	95ESU0802120A	15.2	12.0	7.8	16,500	210312131
EA*4X37L21A	95ESU0802120A	15.2	12.0	7.8	16,500	210312128
EA*4X37L21A	95ESU0802120A	15.2	12.0	7.8	16,500	210312140
EA*4X43L21A	95ESU0802120A	15.2	12.0	7.8	16,500	210315404
EA*4X43L21A	95ESU0802120A	15.2	12.0	7.8	16,500	210315416
EA*4X43L21A	95ESU0802120A	15.2	12.0	7.8	16,500	210315407

Yearly running cost in 10 large cities$1,099-$2,855

Phoenix, AZ$1,343/yr
Miami, FL$1,099/yr
Houston, TX$1,204/yr
Atlanta, GA$1,203/yr
Los Angeles, CA$1,167/yr
New York, NY$2,855/yr
Chicago, IL$2,314/yr
Denver, CO$1,921/yr
Seattle, WA$1,178/yr
Minneapolis, MN$2,376/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 Arcoaire H4H5S36*K*AAA?: The Arcoaire H4H5S36*K*AAA is rated at up to 15.2 SEER2 and 12.5 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the Arcoaire H4H5S36*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 Arcoaire H4H5S36*K*AAA cost to run per year?: At its rated efficiency it costs about $1,099-$2,855 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,343 in Phoenix and $2,376 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 Arcoaire H4H5S36*K*AAA?: ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use EA*4X43L21A, EA*4X37L21A.
What refrigerant does the Arcoaire H4H5S36*K*AAA use?: It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

Running cost and savings

Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

Heat pump $1,327/yrYou save $499/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 Arcoaire H4H5S36*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: $1,327
Current system, per year: $1,826
You save per year: $499
Payback: 27.1 years
Net after 10 years: -$8,512

Cooling $824Heating $503Electricity used: 8,294 kWhSaved vs. a minimum-efficiency heat pump: $72

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.

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Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of January 27, 2025. How we use the data.