What is the SEER2 rating of the 1HVAC EZ-36-HP?

The 1HVAC EZ-36-HP is rated at up to 16.0 SEER2 and 10.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the 1HVAC EZ-36-HP good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 34,600 BTU/h at 5°F with a COP of 1.95, so it is still 2.0 times as efficient as electric resistance heat at that temperature.

How much does the 1HVAC EZ-36-HP cost to run per year?

At its rated efficiency it costs about $1,055-$2,692 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,283 in Phoenix and $2,235 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 1HVAC EZ-36-HP?

ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated one uses EZ-36-AH.

What refrigerant does the 1HVAC EZ-36-HP 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 · EZ Series

1HVAC EZ-36-HP

Below average cooling efficiency and very good heating efficiency for a 3-ton central heat pump, and certified for cold climates.

Ranks #228 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,139 a year to run in a mixed climate like Atlanta.

SEER2: 16.0 Cooling efficiency over a season
Below average · beats 26%
HSPF2: 9.5 Heating efficiency over a season
Very good · beats 70%
EER2: 10.0 Cooling efficiency on a 95°F day
Below average · beats 10%
Heat at 5°F: 34,600 BTU/h87% of its 47°F output
Below average · beats 27%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 34,600 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 70% of central heat pumps.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

Cooling cost matters most - its SEER2 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	1HVAC
Also sold as	DIYCOOL, PolarWave, InfinityLiving
Outdoor unit model	EZ-36-HP
Series	EZ Series
Type	Central heat pump
Nominal size	3 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	October 1, 2022
Last certified	June 9, 2026
Cooling
SEER2Seasonal efficiency, higher is better	16.0 (range 16.0)
EER2Efficiency at 95°F outdoors	10.0
Cooling capacity	36,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.5
Capacity at 47°F	40,000 BTU/h
Capacity at 17°F	30,400 BTU/h
Capacity at 5°F	34,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.95
ENERGY STAR cold climate	Yes

Heating output as it gets colder87% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with EZ-36-AH at the standard test temperatures, in BTU/h:

Certified matchups4 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.
EZ-36-AH · cold climate	16.0	10.0	9.5	34,600	215463873
EZ-36-AH · cold climate	16.0	10.0	9.5	34,600	215463874
EZ-36-AH · cold climate	16.0	10.0	9.5	34,600	215463875
EZ-36-AH · cold climate	16.0	10.0	9.5	34,600	215463876

Yearly running cost in 10 large cities$1,055-$2,692

Phoenix, AZ$1,283/yr
Miami, FL$1,055/yr
Houston, TX$1,149/yr
Atlanta, GA$1,139/yr
Los Angeles, CA$1,103/yr
New York, NY$2,692/yr
Chicago, IL$2,180/yr
Denver, CO$1,808/yr
Seattle, WA$1,107/yr
Minneapolis, MN$2,235/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 1HVAC EZ-36-HP?: The 1HVAC EZ-36-HP is rated at up to 16.0 SEER2 and 10.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the 1HVAC EZ-36-HP good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 34,600 BTU/h at 5°F with a COP of 1.95, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
How much does the 1HVAC EZ-36-HP cost to run per year?: At its rated efficiency it costs about $1,055-$2,692 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,283 in Phoenix and $2,235 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 1HVAC EZ-36-HP?: ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated one uses EZ-36-AH.
What refrigerant does the 1HVAC EZ-36-HP 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 $1,264/yrYou save $658/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 1HVAC EZ-36-HP

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: $1,264
Current system, per year: $1,922
You save per year: $658
Payback: 20.5 years
Net after 10 years: -$6,919

Cooling $792Heating $472Electricity used: 7,897 kWhSaved vs. a minimum-efficiency heat pump: $220

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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Mitsutomo UHO36-NB-Q · cold climate16.0 SEER2 · 9.5 HSPF2
Panasonic CU-HE36YAHK6 · cold climate16.0 SEER2 · 10.0 HSPF2
MRCOOL CENTRAL-36-HP-C-230A00 · cold climate16.0 SEER2 · 9.5 HSPF2
Midea DLCURAH36ABK · cold climate16.0 SEER2 · 10.0 HSPF2
Willis FLEX24/36KUH · cold climate16.0 SEER2 · 9.0 HSPF2
EMI MHSD136DACFC · cold climate16.0 SEER2 · 10.0 HSPF2
RunTru A5HP5036A116.0 SEER2 · 8.5 HSPF2

See all 302 3 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 9, 2026. How we use the data.