What is the SEER2 rating of the Tempstar T5H8T24*K*AAA?

The Tempstar T5H8T24*K*AAA is rated at up to 18.5 SEER2 and 14.0 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 498 certified matchups SEER2 ranges from 15.2-18.5.

Is the Tempstar T5H8T24*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 Tempstar T5H8T24*K*AAA cost to run per year?

At its rated efficiency it costs about $588-$1,789 a year in electricity in large U.S. cities, depending on climate and local rates - for example $755 in Phoenix and $1,518 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 Tempstar T5H8T24*K*AAA?

ENERGY STAR lists 498 certified combinations for this outdoor unit. The highest-rated ones use EVM5X32M17A, EA*5X37M21A, EA*5X37M21A*+WALLCON.

2-ton central heat pump · Mainline 18 SEER2 HP

Tempstar T5H8T24KAAA

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

Ranks #105 of 331 2 ton central heat pumps for cooling efficiency, and costs about $727 a year to run in a mixed climate like Atlanta.

SEER2: 18.5 Cooling efficiency over a season
Very good · beats 77%
HSPF2: 8.5 Heating efficiency over a season
Below average · beats 38%
EER2: 14.0 Cooling efficiency on a 95°F day
Excellent · beats 98%
Heat at 5°F: 11,500 BTU/h45% of its 47°F output
Very good · beats 81%

A good fit if…

You want low cooling bills - its SEER2 beats 77% of central heat pumps.
You want a choice of indoor units - 498 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	Tempstar
Outdoor unit model	T5H8T24KAAA
Series	Mainline 18 SEER2 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 1, 2024
Last certified	September 15, 2026
Cooling
SEER2Seasonal efficiency, higher is better	18.5 (range 15.2-18.5)
EER2Efficiency at 95°F outdoors	11.7-14.0
Cooling capacity	22,200-25,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.5
Capacity at 47°F	24,000-25,400 BTU/h
Capacity at 17°F	14,100-15,000 BTU/h
Capacity at 5°F	10,700-11,500 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.94-2.24
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 EVM5X32M17A at the standard test temperatures, in BTU/h:

Certified matchups498 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 498 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.
EVM5X32M17A	80VSL0701412B	18.5	14.0	7.8	10,900	216361502
EVM5X32M17A	80MSU0401712A	18.5	14.0	7.8	10,800	216361526
EA*5X37M21A	96VSN0802120B	18.0	13.0	8.5	11,200	216366639
EA5X37M21A+WALLCON	80CSU0401712B	18.0	13.0	8.5	11,200	216366799
EA5X37M21A+WALLCON	80CSU0802120B	18.0	13.5	8.5	11,200	216366815
EA*5X37M21A	97VTN0802120A	18.0	13.0	8.5	11,200	216366879
EA*5X37M21A	97VTN1002122A	18.0	13.0	8.5	11,200	216366895
EA*5X37M21A	80VSL1102122B	18.0	13.0	8.5	11,100	216366439
EA*5X37M21A	80MSU0401712A	18.0	13.0	8.5	11,100	216366447
EA*5X37M21A	80MSU0601716A	18.0	13.5	8.5	11,200	216366455
EA*5X37M21A	80MSU0802120A	18.0	13.5	8.5	11,100	216366463
EA*5X37M21A	80VTL1102122B	18.0	13.0	8.5	11,200	216366543
EA*5X37M21A	95MSU1002120A	18.0	13.0	8.5	11,200	216366679
EA5X25M17A+WALLCON	80CSU0401712B	18.0	13.0	8.5	11,200	216365174
EA*5X37M21A	96VTN0802120B	18.0	13.0	8.5	11,200	216366751
EA*5X37M21A	96VTN1002122B	18.0	13.0	8.5	11,200	216366767
FTMA5B36L0C	-	18.0	13.0	8.1	10,700	216368905
EA5X37M21A+WALLCON	97CMN0802120B	18.0	13.0	8.1	11,200	216366599
EA5X37M21A+WALLCON	97CMN1002122B	18.0	13.0	8.1	11,200	216366607
EA*5X37M21A	96VSN0601716B	18.0	13.0	8.1	11,200	216366623
EA*5X37M21A	96VSN1002120B	18.0	13.0	8.1	11,100	216366647
EA5X37M21A+WALLCON	80CSU0601716B	18.0	13.0	8.1	11,200	216366807
EA*5X25M17A	80MSU0401712A	18.0	13.0	8.1	11,100	216364942
EA*5X25M17A	80VSL0701412B	18.0	13.0	8.1	11,000	216364918
EA*5X25M17A	80VSL0701716B	18.0	13.0	8.1	11,100	216364926
EA5X25M17A+WALLCON	80CSU0401712A	18.0	13.0	8.1	11,200	216364894
EA5X37M21A+WALLCON	97CTN1002122A	18.0	13.0	8.1	11,200	216366855
EA5X37M21A+WALLCON	80CTL0901716B	18.0	13.0	8.1	11,200	216366503
EA5X37M21A+WALLCON	80CTL0902120B	18.0	13.0	8.1	11,200	216366511
EA5X37M21A+WALLCON	80CTL1102120B	18.0	13.0	8.1	11,200	216366519
EA5X37M21A+WALLCON	80CSU0601716A	18.0	13.0	8.1	11,200	216366399
EA*5X37M21A	80VSL0901716B	18.0	13.0	8.1	11,100	216366423
EA*5X37M21A	80VTL0701716B	18.0	13.0	8.1	11,100	216366527
EA5X37M21A+WALLCON	95CSU1002122B	18.0	13.0	8.1	11,200	216366567
EA*5X37M21A	95MSU1002122A	18.0	13.0	8.1	11,100	216366687
EA5X37M21A+WALLCON	96CTN1002122B	18.0	13.0	8.1	11,200	216366719
EA*5X37M21A	96VTN0601716B	18.0	13.0	8.1	11,200	216366735
EA*5X37M21A	96VTN1002120B	18.0	13.0	8.1	11,100	216366759
EA5X37M21A+WALLCON	80CSU0401712A	18.0	13.0	8.1	11,200	216366391
FCMA5B36L0C*+WALLCON	-	18.0	13.0	8.0	10,900	216368921
EA5X25M17A+WALLCON	80CSU0601716B	18.0	13.0	8.0	11,200	216365182
EVD5X37M21A	96VTN0802120B	18.0	13.5	7.8	10,900	216364014
EVD5X36M21A	80VTL1102122B	18.0	13.5	7.8	10,800	216363294
EVD5X31M17A	80VSL0451412B	18.0	13.5	7.8	11,000	216362654
EVD5X31M17A	80VSL0701716B	18.0	13.5	7.8	11,100	216362670
EVD5X31M17A	80VTL0451412B	18.0	13.5	7.8	11,000	216362718
EVD5X36M21A	96VTN0802120B	18.0	13.5	7.8	10,800	216363486
EVM5X31M17A	96VTN0601716B	18.0	13.5	7.8	11,100	216361390
EVD5X37M21A	80VSL0701716B	18.0	13.5	7.8	10,900	216363678
EVD5X37M21A	80MSU1002120A	18.0	13.5	7.8	10,900	216363734
EVM5X31M17A	96VSN0601716B	18.0	13.5	7.8	11,100	216361310
EVD5X38M17A	96VSN0601716B	18.0	13.5	7.8	11,100	216364286
EVD5X38M17A	96VTN0601716B	18.0	13.5	7.8	11,100	216364342
EVD5X38M17A	OMV112K14A	18.0	13.5	7.8	11,200	216364366
QFVA5D3617X	-	18.0	14.0	7.8	11,300	218695598
FTMA5X24L0B	-	17.5	13.0	8.1	11,100	216152791
EA*5X25M17A	96VSN0601716B	17.5	13.0	8.1	11,200	216365054
EA*5X25M17A	96VSN0801716B	17.5	13.0	8.1	11,100	216365062
EA*5X25M17A	95MSU0601716A	17.5	13.0	8.1	11,100	216365078
FCMA5X24L0B*+WALLCON	-	17.5	13.0	8.1	11,100	216368913

Yearly running cost in 10 large cities$588-$1,789

Phoenix, AZ$755/yr
Miami, FL$588/yr
Houston, TX$678/yr
Atlanta, GA$727/yr
Los Angeles, CA$717/yr
New York, NY$1,789/yr
Chicago, IL$1,462/yr
Denver, CO$1,224/yr
Seattle, WA$758/yr
Minneapolis, MN$1,518/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 Tempstar T5H8T24*K*AAA?: The Tempstar T5H8T24*K*AAA is rated at up to 18.5 SEER2 and 14.0 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 498 certified matchups SEER2 ranges from 15.2-18.5.
Is the Tempstar T5H8T24*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 Tempstar T5H8T24*K*AAA cost to run per year?: At its rated efficiency it costs about $588-$1,789 a year in electricity in large U.S. cities, depending on climate and local rates - for example $755 in Phoenix and $1,518 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 Tempstar T5H8T24*K*AAA?: ENERGY STAR lists 498 certified combinations for this outdoor unit. The highest-rated ones use EVM5X32M17A, EA*5X37M21A, EA*5X37M21A*+WALLCON.
What refrigerant does the Tempstar T5H8T24*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 $764/yrYou save $451/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 Tempstar T5H8T24*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: $764
Current system, per year: $1,215
You save per year: $451
Payback: 18.8 years
Net after 10 years: -$3,990

Cooling $438Heating $327Electricity used: 4,777 kWhSaved vs. a minimum-efficiency heat pump: $172

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

Kenmore (C,H,T)5H8T24*K*AAA18.5 SEER2 · 8.5 HSPF2
WeatherMaker PH8TAN524**AB18.5 SEER2 · 8.5 HSPF2
Heil N5H8T24*K*AAA18.5 SEER2 · 8.5 HSPF2
Kinghome KD24UXO18.5 SEER2 · 8.3 HSPF2
Heil H5H8T24*K*AAA18.5 SEER2 · 8.5 HSPF2
ECOTEMP W5H8T24*K*AAA18.5 SEER2 · 8.1 HSPF2
Carrier GH8TAN524**AA18.5 SEER2 · 8.5 HSPF2
DuraSTAR DRU1H24S2A · cold climate18.4 SEER2 · 10.5 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.