What is the SEER2 rating of the ECOTEMP W5H8T24*K*AAA?

The ECOTEMP W5H8T24*K*AAA is rated at up to 18.5 SEER2 and 14.0 EER2 for cooling and up to 8.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 248 certified matchups SEER2 ranges from 15.2-18.5.

Is the ECOTEMP W5H8T24*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 ECOTEMP W5H8T24*K*AAA cost to run per year?

At its rated efficiency it costs about $589-$1,850 a year in electricity in large U.S. cities, depending on climate and local rates - for example $764 in Phoenix and $1,575 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 ECOTEMP W5H8T24*K*AAA?

ENERGY STAR lists 248 certified combinations for this outdoor unit. The highest-rated ones use W5VM32M17XA, W5A*25M17XA, WCGL365*C.

2-ton central heat pump · 2-STAGE 18 SEER HP

ECOTEMP W5H8T24KAAA

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

Ranks #108 of 331 2 ton central heat pumps for cooling efficiency, and costs about $747 a year to run in a mixed climate like Atlanta.

SEER2: 18.5 Cooling efficiency over a season
Very good · beats 77%
HSPF2: 8.1 Heating efficiency over a season
Below average · beats 20%
EER2: 14.0 Cooling efficiency on a 95°F day
Excellent · beats 98%
Heat at 5°F: 11,400 BTU/h45% of its 47°F output
Very good · beats 70%

A good fit if…

You want low cooling bills - its SEER2 beats 77% of central heat pumps.
You want a choice of indoor units - 248 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.

Calculate my running cost

Details

Specifications2 ton, R-454B

General
Brand	ECOTEMP
Also sold as	Grandaire
Outdoor unit model	W5H8T24KAAA
Series	2-STAGE 18 SEER HP
Type	Central heat pump
Nominal size	2 ton
CompressorVariable-speed units run longer at low power	Two-stage
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	November 4, 2024
Last certified	September 15, 2026
Cooling
SEER2Seasonal efficiency, higher is better	18.5 (range 15.2-18.5)
EER2Efficiency at 95°F outdoors	11.5-14.0
Cooling capacity	22,200-25,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.1
Capacity at 47°F	24,000-25,000 BTU/h
Capacity at 17°F	14,100-14,900 BTU/h
Capacity at 5°F	10,700-11,400 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.90-2.16
ENERGY STAR cold climate	No

Heating output as it gets colder45% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with W5VM32M17XA at the standard test temperatures, in BTU/h:

Certified matchups248 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 248 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.
W5VM32M17XA	WFET070A036A*	18.5	14.0	7.8	10,900	215614530
W5VM32M17XA	WFET070A036A*	18.5	14.0	7.8	10,900	215614531
W5VM32M17XA	WFEU040B036B*	18.5	14.0	7.8	10,800	215614427
W5VM32M17XA	WFEU040B036B*	18.5	14.0	7.8	10,800	215614428
W5A*25M17XA	WFEU040B036B*	18.0	13.0	8.1	11,100	215644482
W5A*25M17XA	WFEU040B036B*	18.0	13.0	8.1	11,100	215644483
W5A*25M17XA	WFET070A036A*	18.0	13.0	8.1	11,000	215644635
W5A*25M17XA	WFET070A036A*	18.0	13.0	8.1	11,000	215644636
WCGL365*C	-	18.0	13.0	8.1	10,700	215653216
WCGL365*C	-	18.0	13.0	8.1	10,700	215653217
W5VC38M17XA	WFET090B048A*	18.0	14.0	8.0	11,100	215618772
W5VC38M17XA	WFET090B048A*	18.0	14.0	8.0	11,100	215618773
W5VC36M21XA	WFET110C066A*	18.0	13.5	7.8	10,800	215617380
W5VC36M21XA	WFET110C066A*	18.0	13.5	7.8	10,800	215617379
W5VC37M21XA	WFEU100C060B*	18.0	13.5	7.8	10,900	215617977
W5VC37M21XA	WFEU100C060B*	18.0	13.5	7.8	10,900	215617976
W5VM31M17XA	WFST060B048A*	18.0	13.5	7.8	11,100	215614280
W5VM31M17XA	WFST060B048A*	18.0	13.5	7.8	11,100	215614281
W5VC38M17XA	WFST060B048A*	18.0	13.5	7.8	11,100	215618958
W5VC38M17XA	WFST060B048A*	18.0	13.5	7.8	11,100	215618957
W5VC31M17XA	WFET045A036A*	18.0	13.5	7.8	11,000	215616413
W5VC31M17XA	WFET045A036A*	18.0	13.5	7.8	11,000	215616414
QFVA5D3617X	-	18.0	14.0	7.8	11,300	218695387
QFVA5D3617X	-	18.0	14.0	7.8	11,300	218695386
W5A*25M17XA	WFEU060B048B*	17.5	12.5	8.1	11,000	215644512
W5A*25M17XA	WFEU060B048B*	17.5	12.5	8.1	11,000	215644511
W5A*25M17XA	WFET045A036A*	17.5	13.0	8.1	11,000	215644621
W5A*25M17XA	WFET045A036A*	17.5	13.0	8.1	11,000	215644619
W5A*25M17XA	WFET090B048A*	17.5	13.0	8.1	11,100	215644678
W5A*25M17XA	WFET090B048A*	17.5	13.0	8.1	11,100	215644677
W5A*25M17XA	WFST080B048A*	17.5	13.0	8.1	11,100	215645094
W5A*25M17XA	WFST080B048A*	17.5	13.0	8.1	11,100	215645093
W5A*25M17XA	WFSU060B048B*	17.5	13.0	8.1	11,100	215644892
W5A*25M17XA	WFSU060B048B*	17.5	13.0	8.1	11,100	215644893
W5A*25M17XA	WFST060B048A*	17.5	13.0	8.1	11,200	215645066
W5A*25M17XA	WFST060B048A*	17.5	13.0	8.1	11,200	215645064
W5A*36M17XA	WFET045A036A*	17.5	12.5	8.1	10,900	215646428
W5A*36M17XA	WFET045A036A*	17.5	12.5	8.1	10,900	215646430
W5A*36M17XA	WFET070A036A*	17.5	12.5	8.1	10,900	215646445
W5A*36M17XA	WFET070A036A*	17.5	12.5	8.1	10,900	215646447
WCGL245*B	-	17.5	13.0	8.1	11,100	215560677
WCGL245*B	-	17.5	13.0	8.1	11,100	215560676
W5A*37M17XA	WFEU040B036B*	17.5	13.0	8.1	11,000	217191549
W5A*37M17XA	WFEU060B048B*	17.5	13.0	8.1	11,100	217191550
W5A*37M17XA	WFEU060B048B*	17.5	13.0	8.1	11,100	217191551
W5A*37M17XA	WFET045A036A*	17.5	13.0	8.1	11,100	217191552
W5A*37M17XA	WFET045A036A*	17.5	13.0	8.1	11,100	217191553
W5A*37M17XA	WFET070A036A*	17.5	13.0	8.1	11,100	217191554
W5A*37M17XA	WFET070A036A*	17.5	13.0	8.1	11,100	217191555
W5A*37M17XA	WFET090B048A*	17.5	13.0	8.1	11,000	217191557
W5A*37M17XA	WFET090B048A*	17.5	13.0	8.1	11,000	217191556
W5A*37M17XA	WFST080B048A*	17.5	13.0	8.1	11,100	217191567
W5A*37M17XA	WFST080B048A*	17.5	13.0	8.1	11,100	217191568
W5A*37M17XA	WFEU040B036B*	17.5	13.0	8.1	11,000	217191548
W5A*25M17XA	WFJT060B048A*	17.5	13.0	8.0	11,200	215720481
W5A*25M17XA	WFJT060B048A*	17.5	13.0	8.0	11,200	215720482
W5A*25M17XA	WFJT080B048A*	17.5	13.0	8.0	11,100	215720500
W5A*25M17XA	WFJT080B048A*	17.5	13.0	8.0	11,100	215720499
W5A*30M17XA	WFEU060B048B*	17.5	12.0	7.8	10,900	215645534
W5A*30M17XA	WFEU060B048B*	17.5	12.0	7.8	10,900	215645533

Yearly running cost in 10 large cities$589-$1,850

Phoenix, AZ$764/yr
Miami, FL$589/yr
Houston, TX$686/yr
Atlanta, GA$747/yr
Los Angeles, CA$739/yr
New York, NY$1,850/yr
Chicago, IL$1,515/yr
Denver, CO$1,269/yr
Seattle, WA$788/yr
Minneapolis, MN$1,575/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 ECOTEMP W5H8T24*K*AAA?: The ECOTEMP W5H8T24*K*AAA is rated at up to 18.5 SEER2 and 14.0 EER2 for cooling and up to 8.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 248 certified matchups SEER2 ranges from 15.2-18.5.
Is the ECOTEMP W5H8T24*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 ECOTEMP W5H8T24*K*AAA cost to run per year?: At its rated efficiency it costs about $589-$1,850 a year in electricity in large U.S. cities, depending on climate and local rates - for example $764 in Phoenix and $1,575 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 ECOTEMP W5H8T24*K*AAA?: ENERGY STAR lists 248 certified combinations for this outdoor unit. The highest-rated ones use W5VM32M17XA, W5A*25M17XA, WCGL365*C.
What refrigerant does the ECOTEMP W5H8T24*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 $778/yrYou save $434/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 ECOTEMP W5H8T24*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: $778
Current system, per year: $1,212
You save per year: $434
Payback: 19.6 years
Net after 10 years: -$4,157

Cooling $438Heating $340Electricity used: 4,861 kWhSaved vs. a minimum-efficiency heat pump: $156

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

Kinghome KD24UXO18.5 SEER2 · 8.3 HSPF2
DuraSTAR DRU1H24S2A · cold climate18.4 SEER2 · 10.5 HSPF2
WeatherMaker PH8TAN524**AB18.5 SEER2 · 8.5 HSPF2
DuraSTAR DRU1U24S2A · cold climate18.4 SEER2 · 10.4 HSPF2
Tempstar T5H8T24*K*AAA18.5 SEER2 · 8.5 HSPF2
MDV MOX430-24HFN10-M3 · cold climate18.4 SEER2 · 10.4 HSPF2
Kenmore (C,H,T)5H8T24*K*AAA18.5 SEER2 · 8.5 HSPF2
Midea MO1BE-H24B-2A · cold climate18.4 SEER2 · 10.4 HSPF2

See all 331 2 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 15, 2026. How we use the data.