What is the SEER2 rating of the Tempstar T5H6S18*K*AAA?

The Tempstar T5H6S18*K*AAA is rated at up to 15.5 SEER2 and 12.5 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 46 certified matchups SEER2 ranges from 15.2-15.5.

Is the Tempstar T5H6S18*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 1.5-ton model.

How much does the Tempstar T5H6S18*K*AAA cost to run per year?

At its rated efficiency it costs about $548-$1,398 a year in electricity in large U.S. cities, depending on climate and local rates - for example $666 in Phoenix and $1,161 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Tempstar T5H6S18*K*AAA the same as the Kenmore (C,H,T)5H6S18*K*AAA?

Yes, as far as the certified ratings go. ENERGY STAR lists both model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.

Which indoor units work with the Tempstar T5H6S18*K*AAA?

ENERGY STAR lists 46 certified combinations for this outdoor unit. The highest-rated ones use FMA5X24**AL, EVM5X32M17A, FM(C,U)5Z18**AL.

1.5-ton central heat pump · MAINLINE 16 SEER2 HP

Tempstar T5H6S18KAAA

Below average cooling and heating efficiency for a 1.5-ton central heat pump, but not rated for cold climates.

Ranks #146 of 170 1.5 ton central heat pumps for cooling efficiency, and costs about $591 a year to run in a mixed climate like Atlanta.

SEER2: 15.5 Cooling efficiency over a season
Below average · beats 15%
HSPF2: 8.0 Heating efficiency over a season
Below average · beats 12%
EER2: 12.5 Cooling efficiency on a 95°F day
Very good · beats 80%
Heat at 5°F: 8,500 BTU/h46% of its 47°F output
Average · beats 58%

A good fit if…

You want a choice of indoor units - 46 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

Specifications1.5 ton, R-454B

General
Brand	Tempstar
Also sold as	Kenmore
Outdoor unit model	T5H6S18KAAA
Series	MAINLINE 16 SEER2 HP
Type	Central heat pump
Nominal size	1.5 ton
CompressorVariable-speed units run longer at low power	Single stage
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	July 1, 2022
Last certified	July 16, 2026
Cooling
SEER2Seasonal efficiency, higher is better	15.5 (range 15.2-15.5)
EER2Efficiency at 95°F outdoors	11.7-12.5
Cooling capacity	17,400-18,900 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.0
Capacity at 47°F	16,400-18,100 BTU/h
Capacity at 17°F	10,500-10,900 BTU/h
Capacity at 5°F	8,200-8,500 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.94-2.10
ENERGY STAR cold climate	No

Heating output as it gets colder46% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with FMA5X24**AL at the standard test temperatures, in BTU/h:

Certified matchups46 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.
FMA5X24**AL	-	15.5	12.5	8.0	8,200	214423970
EVM5X32M17A	80MS(N,L)0701712A	15.5	12.0	7.8	8,200	214156830
EVM5X32M17A	80MS(N,L)0701716A	15.5	12.0	7.8	8,200	214156838
FM(C,U)5Z18**AL	-	15.2	12.0	8.0	8,500	215828878
FM(C,U)5Z24**AL	-	15.2	12.0	8.0	8,500	215828886
EA*5X25M17A	80VSL0451412B	15.2	12.0	7.8	8,400	214150718
EA*5X25M17A	80VSL0701716B	15.2	12.0	7.8	8,400	214150734
EA*5X25M17A	80ESU0401712A	15.2	12.0	7.8	8,400	214150750
EA*5X25M17A	80MSU0401712A	15.2	12.0	7.8	8,400	214150766
EA*5X25M17A	80MSU0601716A	15.2	12.0	7.8	8,400	214150774
EA*5X25M17A	80CTL0701412B	15.2	12.0	7.8	8,400	214150791
EA*5X25M17A	80CTL0701716B	15.2	12.0	7.8	8,500	214150799
EA*5X25M17A	80CTL0901716B	15.2	12.0	7.8	8,500	214150807
EA*5X25M17A	80VTL0451412B	15.2	12.0	7.8	8,400	214150823
EA*5X25M17A	80VTL0701716B	15.2	11.7	7.8	8,500	214150831
EA*5X25M17A	92MSN0601714A	15.2	12.0	7.8	8,400	214150903
EA*5X25M17A	92MSN0801716A	15.2	12.0	7.8	8,400	214150911
EA*5X25M17A	96MSN0801716A	15.2	11.7	7.8	8,500	214150927
EA*5X25M17A	95MSU0601716A	15.2	12.0	7.8	8,500	214150959
EA*5X25M17A	96CTN0801714B	15.2	12.0	7.8	8,400	214150975
EA*5X25M17A	96VTN0601716B	15.2	11.7	7.8	8,400	214150999
EA*5X19M17A	80MSU0401712A	15.2	12.0	7.8	8,400	214150389
EA*5X19M17A	80MSU0601716A	15.2	12.0	7.8	8,400	214150397
EA*5X19M17A	80MS(N,L)0451412A	15.2	12.0	7.8	8,400	214150301
EA*5X19M17A	80VSL0451412B	15.2	11.7	7.8	8,400	214150349
EA*5X19M17A	80VSL0701716B	15.2	11.7	7.8	8,400	214150365
EA*5X19M17A	80ESU0401712A	15.2	12.0	7.8	8,300	214150373
EA*5X19M17A	80MS(N,L)0701412A	15.2	12.0	7.8	8,400	214150309
EA*5X19M17A	80MS(N,L)0701712A	15.2	12.0	7.8	8,300	214150317
EA*5X19M17A	80MS(N,L)0701716A	15.2	12.0	7.8	8,400	214150325
EA*5X19M17A	80MS(N,L)0901714A	15.2	12.0	7.8	8,400	214150333
EA*5X19M17A	80CTL0701412B	15.2	12.0	7.8	8,400	214150421
EA*5X19M17A	80CTL0901716B	15.2	12.0	7.8	8,400	214150437
EA*5X19M17A	92MSN0601714A	15.2	12.0	7.8	8,400	214150510
EA*5X19M17A	92MSN0801716A	15.2	12.0	7.8	8,400	214150518
EA*5X19M17A	95MSU0601716A	15.2	12.0	7.8	8,400	214150574
EA*5X19M17A	96CTN0801714B	15.2	12.0	7.8	8,400	214150590
EA*5X25M17A	80MS(N,L)0451412A	15.2	12.0	7.8	8,400	214150662
EA*5X25M17A	80MS(N,L)0701412A	15.2	12.0	7.8	8,400	214150678
EA*5X25M17A	80MS(N,L)0701712A	15.2	12.0	7.8	8,400	214150686
EA*5X25M17A	80MS(N,L)0701716A	15.2	12.0	7.8	8,500	214150694
EA*5X25M17A	80MS(N,L)0901714A	15.2	12.0	7.8	8,400	214150702
FHMA530LB	-	15.2	12.0	7.8	8,400	214165182
FMA5X18**AL	-	15.2	12.0	7.8	8,200	214423962
FM(C,U)5Z30**AL	-	15.2	12.0	7.8	8,200	215828894
F5MA530LB	-	15.2	12.0	7.8	8,400	216463730

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the Tempstar T5H6S18*K*AAA: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

Kenmore (C,H,T)5H6S18*K*AAA

Yearly running cost in 10 large cities$548-$1,398

Phoenix, AZ$666/yr
Miami, FL$548/yr
Houston, TX$597/yr
Atlanta, GA$591/yr
Los Angeles, CA$573/yr
New York, NY$1,398/yr
Chicago, IL$1,132/yr
Denver, CO$939/yr
Seattle, WA$575/yr
Minneapolis, MN$1,161/yr

At each state's average electricity price and the city's typical heating and cooling hours.

Questions6

What is the SEER2 rating of the Tempstar T5H6S18*K*AAA?: The Tempstar T5H6S18*K*AAA is rated at up to 15.5 SEER2 and 12.5 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 46 certified matchups SEER2 ranges from 15.2-15.5.
Is the Tempstar T5H6S18*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 1.5-ton model.
How much does the Tempstar T5H6S18*K*AAA cost to run per year?: At its rated efficiency it costs about $548-$1,398 a year in electricity in large U.S. cities, depending on climate and local rates - for example $666 in Phoenix and $1,161 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Tempstar T5H6S18*K*AAA the same as the Kenmore (C,H,T)5H6S18*K*AAA?: Yes, as far as the certified ratings go. ENERGY STAR lists both model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
Which indoor units work with the Tempstar T5H6S18*K*AAA?: ENERGY STAR lists 46 certified combinations for this outdoor unit. The highest-rated ones use FMA5X24**AL, EVM5X32M17A, FM(C,U)5Z18**AL.
What refrigerant does the Tempstar T5H6S18*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 $656/yrYou save $267/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 T5H6S18*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: $656
Current system, per year: $923
You save per year: $267
Payback: 26.2 years
Net after 10 years: -$4,326

Cooling $411Heating $245Electricity used: 4,100 kWhSaved vs. a minimum-efficiency heat pump: $51

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 1.5 ton models

Heil N5H5S18*K*AAA15.5 SEER2 · 8.0 HSPF2
WeatherMaker PH5SAN518**AB15.5 SEER2 · 8.0 HSPF2
Heil H5H6S18*K*AAA15.5 SEER2 · 8.0 HSPF2
DETTSON MHD-18 · cold climate15.2 SEER2 · 9.5 HSPF2
Heil B5H6S18*K*AAA15.5 SEER2 · 8.0 HSPF2
Ameristar E4HL5018A1000A · cold climate15.2 SEER2 · 8.5 HSPF2
Grandaire W5H5S18*K*AAA15.5 SEER2 · 8.0 HSPF2
TCL THH18HAI2NAF2U23 · cold climate15.2 SEER2 · 8.5 HSPF2

See all 170 1.5 ton central heat pumps, ranked

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