What is the SEER2 rating of the Grandaire W5H5S24*K*AAA?

The Grandaire W5H5S24*K*AAA is rated at up to 16.5 SEER2 and 13.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 154 certified matchups SEER2 ranges from 15.2-16.5.

Is the Grandaire W5H5S24*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 2-ton model.

How much does the Grandaire W5H5S24*K*AAA cost to run per year?

At its rated efficiency it costs about $671-$1,726 a year in electricity in large U.S. cities, depending on climate and local rates - for example $818 in Phoenix and $1,435 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 W5H5S24*K*AAA?

ENERGY STAR lists 154 certified combinations for this outdoor unit. The highest-rated ones use FMA5X30**AL, W5VC31M17XA, W5VC38M17XA.

2-ton central heat pump · 15 SEER2 HP

Grandaire W5H5S24KAAA

Average cooling efficiency and below average heating efficiency for a 2-ton central heat pump, but not rated for cold climates.

Ranks #258 of 331 2 ton central heat pumps for cooling efficiency, and costs about $729 a year to run in a mixed climate like Atlanta.

SEER2: 16.5 Cooling efficiency over a season
Average · beats 40%
HSPF2: 8.5 Heating efficiency over a season
Below average · beats 38%
EER2: 13.0 Cooling efficiency on a 95°F day
Very good · beats 89%
Heat at 5°F: 11,900 BTU/h49% of its 47°F output
Very good · beats 83%

A good fit if…

You want a choice of indoor units - 154 certified pairings.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
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

Specifications2 ton, R-454B

General
Brand	Grandaire
Also sold as	ECOTEMP
Outdoor unit model	W5H5S24KAAA
Series	15 SEER2 HP
Type	Central heat pump
Nominal size	2 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 16, 2026
Cooling
SEER2Seasonal efficiency, higher is better	16.5 (range 15.2-16.5)
EER2Efficiency at 95°F outdoors	11.7-13.0
Cooling capacity	22,200-24,400 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.5
Capacity at 47°F	21,800-24,000 BTU/h
Capacity at 17°F	14,200-15,200 BTU/h
Capacity at 5°F	10,800-11,900 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.98-2.26
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 FMA5X30**AL at the standard test temperatures, in BTU/h:

Certified matchups154 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 154 are shown. 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.
FMA5X30**AL	-	16.5	13.0	8.5	11,600	214424097
FMA5X30**AL	-	16.5	13.0	8.5	11,600	214424098
W5VC31M17XA	WFET090B048A*	16.0	12.0	7.8	11,300	214205211
W5VC31M17XA	WFET090B048A*	16.0	12.0	7.8	11,300	214205212
W5VC38M17XA	WFET090B048A*	16.0	12.5	7.8	11,400	214214390
W5VC38M17XA	WFET090B048A*	16.0	12.5	7.8	11,400	214214389
W5VC37M21XA	WFE090C048C	16.0	12.0	7.8	11,200	214213416
W5VC37M21XA	WFE090C048C	16.0	12.0	7.8	11,200	214213417
W5VC38M17XA	WFAX060B042B*	16.0	12.0	7.8	11,400	214214508
W5VC38M17XA	WFAX060B042B*	16.0	12.0	7.8	11,400	214214509
W5VM32M17XA	WFEU060B048B*	16.0	12.5	7.8	11,300	214212761
W5VM32M17XA	WFEU060B048B*	16.0	12.5	7.8	11,300	214212762
W5VM32M17XA	WFET090B048A*	16.0	12.0	7.8	11,400	214212897
W5VM32M17XA	WFET090B048A*	16.0	12.0	7.8	11,400	214212898
W5VM32M17XA	WFAX080B048B*	16.0	12.0	7.8	11,200	214213022
W5VM32M17XA	WFAX080B048B*	16.0	12.0	7.8	11,200	214213021
W5A*25M17XA	WFEU040B036B*	16.0	12.5	7.8	11,300	214210554
W5A*25M17XA	WFEU040B036B*	16.0	12.5	7.8	11,300	214210553
W5A*25M17XA	WFEU060B048B*	16.0	12.0	7.8	11,200	214210585
W5A*25M17XA	WFEU060B048B*	16.0	12.0	7.8	11,200	214210586
W5VC38M17XA	WFE070B048C	16.0	12.0	7.8	11,400	214214028
W5VC38M17XA	WFE070B048C	16.0	12.0	7.8	11,400	214214029
W5VM31M17XA	WFEU060B048B*	16.0	12.0	7.8	11,200	214212373
W5VM31M17XA	WFEU060B048B*	16.0	12.0	7.8	11,200	214212374
W5VC38M17XA	WFE070B036C	16.0	12.5	7.8	11,400	214213996
W5VC38M17XA	WFE070B036C	16.0	12.5	7.8	11,400	214213997
W5VC38M17XA	WFE090B042C	16.0	12.5	7.8	11,200	214214060
W5VC38M17XA	WFE090B042C	16.0	12.5	7.8	11,200	214214061
W5VC38M17XA	WFEU060B048B*	16.0	12.5	7.8	11,200	214214256
W5VC38M17XA	WFEU060B048B*	16.0	12.5	7.8	11,200	214214257
W5VC31M17XA	WFEU060B048B*	16.0	12.5	7.8	11,200	214213298
W5VC31M17XA	WFEU060B048B*	16.0	12.5	7.8	11,200	214213297
W5VM32M17XA	WFE090B042C	16.0	12.0	7.8	11,200	214212565
W5VM32M17XA	WFE090B042C	16.0	12.0	7.8	11,200	214212566
FM(C,U)5Z30**AL	-	16.0	12.5	7.8	11,100	215828957
FM(C,U)5Z30**AL	-	16.0	12.5	7.8	11,100	215828958
FM(C,U)5Z36**AL	-	16.0	12.5	7.8	11,100	215828989
FM(C,U)5Z36**AL	-	16.0	12.5	7.8	11,100	215828990
FM(C,U)5Z24**AL	-	15.5	12.0	8.0	11,300	215828925
FM(C,U)5Z24**AL	-	15.5	12.0	8.0	11,300	215828926
FEVA0036**+NAVA53601CK	-	15.5	12.0	8.0	11,300	217051541
FEVA0036**+NAVA53601CK	-	15.5	12.0	8.0	11,300	217051542
FM(C,U)5S36**AL	-	15.5	12.5	8.0	11,200	218452335
FM(C,U)5S36**AL	-	15.5	12.5	8.0	11,200	218452334
FM(C,U)5S30**AL	-	15.5	12.5	8.0	11,200	218452303
FM(C,U)5S30**AL	-	15.5	12.5	8.0	11,200	218452302
WCHL365*B	-	15.5	12.0	7.8	11,400	214179797
WCHL365*B	-	15.5	12.0	7.8	11,400	214179798
WCGL245*B	-	15.5	12.0	7.8	11,200	214179881
WCGL245*B	-	15.5	12.0	7.8	11,200	214179882
W5A*25M17XA	WFSX060B048B*	15.5	12.0	7.8	11,400	214198050
W5A*25M17XA	WFSX060B048B*	15.5	12.0	7.8	11,400	214198049
W5VC31M17XA	WFSU060B048B*	15.5	12.0	7.8	11,300	214205624
W5VC31M17XA	WFSU060B048B*	15.5	12.0	7.8	11,300	214205625
W5VC38M17XA	WFST060B048A*	15.5	12.0	7.8	11,400	214207767
W5VC38M17XA	WFST060B048A*	15.5	12.0	7.8	11,400	214207768
W5VM32M17XA	WFST060B048A*	15.5	12.0	7.8	11,400	214204812
W5VM32M17XA	WFST060B048A*	15.5	12.0	7.8	11,400	214204813
W5VM32M17XA	WFST080B048A*	15.5	12.0	7.8	11,300	214204845
W5VM32M17XA	WFST080B048A*	15.5	12.0	7.8	11,300	214204846

Yearly running cost in 10 large cities$671-$1,726

Phoenix, AZ$818/yr
Miami, FL$671/yr
Houston, TX$733/yr
Atlanta, GA$729/yr
Los Angeles, CA$706/yr
New York, NY$1,726/yr
Chicago, IL$1,398/yr
Denver, CO$1,160/yr
Seattle, WA$711/yr
Minneapolis, MN$1,435/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 W5H5S24*K*AAA?: The Grandaire W5H5S24*K*AAA is rated at up to 16.5 SEER2 and 13.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 154 certified matchups SEER2 ranges from 15.2-16.5.
Is the Grandaire W5H5S24*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 2-ton model.
How much does the Grandaire W5H5S24*K*AAA cost to run per year?: At its rated efficiency it costs about $671-$1,726 a year in electricity in large U.S. cities, depending on climate and local rates - for example $818 in Phoenix and $1,435 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 W5H5S24*K*AAA?: ENERGY STAR lists 154 certified combinations for this outdoor unit. The highest-rated ones use FMA5X30**AL, W5VC31M17XA, W5VC38M17XA.
What refrigerant does the Grandaire W5H5S24*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 $807/yrYou save $401/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 W5H5S24*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: $807
Current system, per year: $1,207
You save per year: $401
Payback: 22.5 years
Net after 10 years: -$4,995

Cooling $503Heating $303Electricity used: 5,041 kWhSaved vs. a minimum-efficiency heat pump: $118

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 2 ton models

Carrier GH5SAN524**AA16.5 SEER2 · 8.5 HSPF2
Heil B5H6S24*K*AAA16.5 SEER2 · 8.5 HSPF2
Carrier 27SCA524A**3016.5 SEER2 · 8.5 HSPF2
Heil H5H6S24*K*AAA16.5 SEER2 · 8.5 HSPF2
Bryant PH5SAN524**AA16.5 SEER2 · 8.5 HSPF2
Tempstar N5H5S24*K*AAA16.5 SEER2 · 8.5 HSPF2
Bryant 235SAN024**AA16.5 SEER2 · 8.5 HSPF2
Tempstar T5H6S24*K*AAA16.5 SEER2 · 8.5 HSPF2

See all 331 2 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 16, 2026. How we use the data.