What is the SEER2 rating of the KEEN Home KEENSTDHP36AA?

The KEEN Home KEENSTDHP36AA is rated at up to 16.1 SEER2 and 10.0 EER2 for cooling and up to 8.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 15.4-16.1.

Is the KEEN Home KEENSTDHP36AA good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 28,400 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.

How much does the KEEN Home KEENSTDHP36AA cost to run per year?

At its rated efficiency it costs about $1,049-$2,710 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,280 in Phoenix and $2,254 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 KEEN Home KEENSTDHP36AA?

ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use KEENHYDAH36AA, KEENSTPAH36AA.

3-ton central heat pump · KEEN Series

KEEN Home KEENSTDHP36AA

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

Ranks #216 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,143 a year to run in a mixed climate like Atlanta.

SEER2: 16.1 Cooling efficiency over a season
Below average · beats 34%
HSPF2: 8.7 Heating efficiency over a season
Average · beats 47%
EER2: 10.0 Cooling efficiency on a 95°F day
Below average · beats 10%
Heat at 5°F: 28,400 BTU/h75% of its 47°F output
Below average · beats 39%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 28,400 BTU/h at 5°F.
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.

Calculate my running cost

Details

Specifications3 ton, R-454B

General
Brand	KEEN Home
Outdoor unit model	KEENSTDHP36AA
Series	KEEN Series
Type	Central heat pump
Nominal size	3 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	July 4, 2025
Last certified	July 24, 2025
Cooling
SEER2Seasonal efficiency, higher is better	16.1 (range 15.4-16.1)
EER2Efficiency at 95°F outdoors	9.2-10.0
Cooling capacity	36,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.7
Capacity at 47°F	36,000-37,000 BTU/h
Capacity at 17°F	24,600-24,800 BTU/h
Capacity at 5°F	27,000-28,400 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.86-2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder75% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with KEENHYDAH36AA at the standard test temperatures, in BTU/h:

Certified matchups2 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.
KEENHYDAH36AA · cold climate	16.1	10.0	8.7	27,000	217596874
KEENSTPAH36AA · cold climate	15.4	9.2	8.7	28,400	217596888

Yearly running cost in 10 large cities$1,049-$2,710

Phoenix, AZ$1,280/yr
Miami, FL$1,049/yr
Houston, TX$1,147/yr
Atlanta, GA$1,143/yr
Los Angeles, CA$1,108/yr
New York, NY$2,710/yr
Chicago, IL$2,196/yr
Denver, CO$1,822/yr
Seattle, WA$1,117/yr
Minneapolis, MN$2,254/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 KEEN Home KEENSTDHP36AA?: The KEEN Home KEENSTDHP36AA is rated at up to 16.1 SEER2 and 10.0 EER2 for cooling and up to 8.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 15.4-16.1.
Is the KEEN Home KEENSTDHP36AA good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 28,400 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
How much does the KEEN Home KEENSTDHP36AA cost to run per year?: At its rated efficiency it costs about $1,049-$2,710 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,280 in Phoenix and $2,254 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 KEEN Home KEENSTDHP36AA?: ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use KEENHYDAH36AA, KEENSTPAH36AA.
What refrigerant does the KEEN Home KEENSTDHP36AA 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 $1,263/yrYou save $609/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 KEEN Home KEENSTDHP36AA

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: $1,263
Current system, per year: $1,873
You save per year: $609
Payback: 22.2 years
Net after 10 years: -$7,408

Cooling $787Heating $476Electricity used: 7,896 kWhSaved vs. a minimum-efficiency heat pump: $175

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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Blueridge BNG2A36SCN · cold climate16.1 SEER2 · 8.7 HSPF2
Thermal Zone TZID36H520ZCS · cold climate16.1 SEER2 · 8.7 HSPF2
AproDr AHU19-36HN1-C · cold climate16.1 SEER2 · 8.7 HSPF2
TRUST AIR CONDITIONERS AH36H/O64P · cold climate16.1 SEER2 · 8.7 HSPF2
AC Pro SPHP-Y-V036BB · cold climate16.1 SEER2 · 8.7 HSPF2
Blueridge BMAH3618C · cold climate16.0 SEER2 · 10.0 HSPF2

See all 302 3 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 24, 2025. How we use the data.