What is the SEER2 rating of the Grandaire W5H5S36*K*AAA?

The Grandaire W5H5S36*K*AAA is rated at up to 16.0 SEER2 and 13.0 EER2 for cooling and up to 8.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 32 certified matchups SEER2 ranges from 15.2-16.0.

Is the Grandaire W5H5S36*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 Grandaire W5H5S36*K*AAA cost to run per year?

At its rated efficiency it costs about $1,028-$2,773 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,271 in Phoenix and $2,320 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 Grandaire W5H5S36*K*AAA?

ENERGY STAR lists 32 certified combinations for this outdoor unit. The highest-rated ones use FEVA0048**+NAVA54801CK, WCGL485*C, WCHL485*C.

3-ton central heat pump · 15 SEER2 HP

Grandaire W5H5S36KAAA

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

Ranks #246 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,158 a year to run in a mixed climate like Atlanta.

SEER2: 16.0 Cooling efficiency over a season
Below average · beats 26%
HSPF2: 8.0 Heating efficiency over a season
Below average · beats 12%
EER2: 13.0 Cooling efficiency on a 95°F day
Very good · beats 89%
Heat at 5°F: 18,100 BTU/h48% of its 47°F output
Very good · beats 80%

A good fit if…

You want a choice of indoor units - 32 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 ton, R-454B

General
Brand	Grandaire
Also sold as	ECOTEMP
Outdoor unit model	W5H5S36KAAA
Series	15 SEER2 HP
Type	Central heat pump
Nominal size	3 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	16.0 (range 15.2-16.0)
EER2Efficiency at 95°F outdoors	12.0-13.0
Cooling capacity	33,800-36,800 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.0
Capacity at 47°F	33,200-36,400 BTU/h
Capacity at 17°F	21,000-22,800 BTU/h
Capacity at 5°F	16,100-18,100 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.00-2.22
ENERGY STAR cold climate	No

Heating output as it gets colder48% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with FEVA0048**+NAVA54801CK at the standard test temperatures, in BTU/h:

Certified matchups32 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.
FEVA0048**+NAVA54801CK	-	16.0	13.0	8.0	17,400	217051661
FEVA0048**+NAVA54801CK	-	16.0	13.0	8.0	17,400	217051662
WCGL485*C	-	15.5	12.5	7.8	16,700	214179961
WCGL485*C	-	15.5	12.5	7.8	16,700	214179962
WCHL485*C	-	15.5	13.0	7.8	17,400	214180203
WCHL485*C	-	15.5	13.0	7.8	17,400	214180204
FEVB0048**+NAVA54801CK	-	15.5	12.5	7.8	17,400	214277632
FEVB0048**+NAVA54801CK	-	15.5	12.5	7.8	17,400	214277634
FMA5X36**AL	-	15.5	12.5	7.8	17,000	214424313
FMA5X36**AL	-	15.5	12.5	7.8	17,000	214424314
FM(C,U)5S36**AL	-	15.2	12.0	8.0	17,300	218452431
FM(C,U)5S36**AL	-	15.2	12.0	8.0	17,300	218452430
W5A*43M21XA	WFE110C060C	15.2	12.0	7.8	18,000	214139999
W5A*43M21XA	WFE110C060C	15.2	12.0	7.8	18,000	214140000
W5VM44M21XA	WFEU040B036A*	15.2	12.0	7.8	18,100	214143071
W5VM44M21XA	WFEU040B036A*	15.2	12.0	7.8	18,100	214143072
W5A*43M21XA	WFAX100C060B*	15.2	12.0	7.8	17,900	214140536
W5A*43M21XA	WFAX100C060B*	15.2	12.0	7.8	17,900	214140537
W5A*48M21XA	WFE110C060C	15.2	12.0	7.8	17,600	214141393
W5A*48M21XA	WFE110C060C	15.2	12.0	7.8	17,600	214141394
W5A*48M21XA	WFAX100C060B*	15.2	12.0	7.8	17,600	214142282
W5A*48M21XA	WFAX100C060B*	15.2	12.0	7.8	17,600	214142283
W5A*48M21XA	WFEU060B048B*	15.2	12.0	7.8	17,600	214141655
W5A*48M21XA	WFEU060B048B*	15.2	12.0	7.8	17,600	214141656
W5A*48M21XA	WFEU080C060B*	15.2	12.0	7.8	17,300	214141687
W5A*48M21XA	WFEU080C060B*	15.2	12.0	7.8	17,300	214141688
W5VC42M24XA	WFEU100C060B*	15.2	12.0	7.8	18,100	214144616
W5VC42M24XA	WFEU100C060B*	15.2	12.0	7.8	18,100	214144617
WCHL425*C	-	15.2	12.5	7.8	16,100	214179920
WCHL425*C	-	15.2	12.5	7.8	16,100	214179919
FM(C,U)5Z36**AL	-	15.2	12.5	7.8	17,200	215829125
FM(C,U)5Z36**AL	-	15.2	12.5	7.8	17,200	215829126

Yearly running cost in 10 large cities$1,028-$2,773

Phoenix, AZ$1,271/yr
Miami, FL$1,028/yr
Houston, TX$1,139/yr
Atlanta, GA$1,158/yr
Los Angeles, CA$1,128/yr
New York, NY$2,773/yr
Chicago, IL$2,253/yr
Denver, CO$1,874/yr
Seattle, WA$1,152/yr
Minneapolis, MN$2,320/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 Grandaire W5H5S36*K*AAA?: The Grandaire W5H5S36*K*AAA is rated at up to 16.0 SEER2 and 13.0 EER2 for cooling and up to 8.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 32 certified matchups SEER2 ranges from 15.2-16.0.
Is the Grandaire W5H5S36*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 Grandaire W5H5S36*K*AAA cost to run per year?: At its rated efficiency it costs about $1,028-$2,773 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,271 in Phoenix and $2,320 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 Grandaire W5H5S36*K*AAA?: ENERGY STAR lists 32 certified combinations for this outdoor unit. The highest-rated ones use FEVA0048**+NAVA54801CK, WCGL485*C, WCHL485*C.
What refrigerant does the Grandaire W5H5S36*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 $1,263/yrYou save $545/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 Grandaire W5H5S36*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: $1,263
Current system, per year: $1,808
You save per year: $545
Payback: 23.8 years
Net after 10 years: -$7,548

Cooling $770Heating $493Electricity used: 7,893 kWhSaved vs. a minimum-efficiency heat pump: $124

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

Frigidaire FSH4BF5M2SX36K16.0 SEER2 · 8.0 HSPF2
Heil R5H5S36*K*AAA16.0 SEER2 · 8.0 HSPF2
Ducane 7HP14F36P-**A16.0 SEER2 · 8.0 HSPF2
Lennox EL16KP1-036-230A16.0 SEER2 · 8.0 HSPF2
Carrier 27SCA536A**3016.0 SEER2 · 8.0 HSPF2
Maytag PSH4BF5M2SX36K16.0 SEER2 · 8.0 HSPF2
Bryant PH5SAN536**AA16.0 SEER2 · 8.0 HSPF2
NORDYNE SH4BF5M2SX36K16.0 SEER2 · 8.0 HSPF2

See all 302 3 ton central heat pumps, ranked

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