What is the SEER2 rating of the Heil B5H6S18*K*AAA?

The Heil B5H6S18*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 352 certified matchups SEER2 ranges from 15.2-15.5.

Is the Heil B5H6S18*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 Heil B5H6S18*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.

Which indoor units work with the Heil B5H6S18*K*AAA?

ENERGY STAR lists 352 certified combinations for this outdoor unit. The highest-rated ones use FMA5X24**AL, EVM5X32M17A, FM(C,U)5Z24**AL.

1.5-ton central heat pump · MAINLINE 16 SEER2 HP

Heil B5H6S18KAAA

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

Ranks #143 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 - 352 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	Heil
Also sold as	Arcoaire, Airquest, Kenmore, Tempstar, Keeprite, Day & Night, Comfortmaker
Outdoor unit model	B5H6S18KAAA
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	June 29, 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 matchups352 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 352 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.
FMA5X24**AL	-	15.5	12.5	8.0	8,200	218214661
FMA5X24**AL	-	15.5	12.5	8.0	8,200	218217199
FMA5X24**AL	-	15.5	12.5	8.0	8,200	218216838
FMA5X24**AL	-	15.5	12.5	8.0	8,200	218216396
FMA5X24**AL	-	15.5	12.5	8.0	8,200	218216395
FMA5X24**AL	-	15.5	12.5	8.0	8,200	218216394
FMA5X24**AL	-	15.5	12.5	8.0	8,200	218215341
FMA5X24**AL	-	15.5	12.5	8.0	8,200	218215340
EVM5X32M17A	80MS(N,L)0701716A	15.5	12.0	7.8	8,200	218214467
EVM5X32M17A	80MS(N,L)0701712A	15.5	12.0	7.8	8,200	218214466
EVM5X32M17A	80MS(N,L)0701716A	15.5	12.0	7.8	8,200	218214953
EVM5X32M17A	80MS(N,L)0701716A	15.5	12.0	7.8	8,200	218214952
EVM5X32M17A	80MS(N,L)0701712A	15.5	12.0	7.8	8,200	218214951
EVM5X32M17A	80MS(N,L)0701712A	15.5	12.0	7.8	8,200	218214950
EVM5X32M17A	80MS(N,L)0701716A	15.5	12.0	7.8	8,200	218217005
EVM5X32M17A	80MS(N,L)0701712A	15.5	12.0	7.8	8,200	218217004
EVM5X32M17A	80MS(N,L)0701716A	15.5	12.0	7.8	8,200	218216644
EVM5X32M17A	80MS(N,L)0701712A	15.5	12.0	7.8	8,200	218216643
EVM5X32M17A	80MS(N,L)0701716A	15.5	12.0	7.8	8,200	218215813
EVM5X32M17A	80MS(N,L)0701716A	15.5	12.0	7.8	8,200	218215812
EVM5X32M17A	80MS(N,L)0701716A	15.5	12.0	7.8	8,200	218215811
EVM5X32M17A	80MS(N,L)0701712A	15.5	12.0	7.8	8,200	218215810
EVM5X32M17A	80MS(N,L)0701712A	15.5	12.0	7.8	8,200	218215809
EVM5X32M17A	80MS(N,L)0701712A	15.5	12.0	7.8	8,200	218215808
FM(C,U)5Z24**AL	-	15.2	12.0	8.0	8,500	218214695
FM(C,U)5Z18**AL	-	15.2	12.0	8.0	8,500	218214694
FM(C,U)5Z24**AL	-	15.2	12.0	8.0	8,500	218217233
FM(C,U)5Z18**AL	-	15.2	12.0	8.0	8,500	218217232
FM(C,U)5Z24**AL	-	15.2	12.0	8.0	8,500	218216872
FM(C,U)5Z18**AL	-	15.2	12.0	8.0	8,500	218216871
FM(C,U)5Z24**AL	-	15.2	12.0	8.0	8,500	218216498
FM(C,U)5Z24**AL	-	15.2	12.0	8.0	8,500	218216497
FM(C,U)5Z24**AL	-	15.2	12.0	8.0	8,500	218216496
FM(C,U)5Z18**AL	-	15.2	12.0	8.0	8,500	218216495
FM(C,U)5Z18**AL	-	15.2	12.0	8.0	8,500	218216494
FM(C,U)5Z18**AL	-	15.2	12.0	8.0	8,500	218216493
FM(C,U)5Z24**AL	-	15.2	12.0	8.0	8,500	218215409
FM(C,U)5Z24**AL	-	15.2	12.0	8.0	8,500	218215408
FM(C,U)5Z18**AL	-	15.2	12.0	8.0	8,500	218215407
FM(C,U)5Z18**AL	-	15.2	12.0	8.0	8,500	218215406
FM(C,U)5Z30**AL	-	15.2	12.0	7.8	8,200	218214696
FMA5X18**AL	-	15.2	12.0	7.8	8,200	218214660
FHMA530LB	-	15.2	12.0	7.8	8,400	218214562
EA*5X25M17A	96VTN0601716B	15.2	11.7	7.8	8,400	218214401
EA*5X25M17A	96CTN0801714B	15.2	12.0	7.8	8,400	218214399
EA*5X25M17A	95MSU0601716A	15.2	12.0	7.8	8,500	218214397
EA*5X25M17A	96MSN0801716A	15.2	11.7	7.8	8,500	218214394
EA*5X25M17A	92MSN0801716A	15.2	12.0	7.8	8,400	218214393
EA*5X25M17A	92MSN0601714A	15.2	12.0	7.8	8,400	218214392
EA*5X25M17A	80VTL0701716B	15.2	11.7	7.8	8,500	218214387
EA*5X25M17A	80VTL0451412B	15.2	12.0	7.8	8,400	218214386
EA*5X25M17A	80CTL0901716B	15.2	12.0	7.8	8,500	218214385
EA*5X25M17A	80CTL0701716B	15.2	12.0	7.8	8,500	218214384
EA*5X25M17A	80CTL0701412B	15.2	12.0	7.8	8,400	218214383
EA*5X25M17A	80MSU0601716A	15.2	12.0	7.8	8,400	218214382
EA*5X25M17A	80MSU0401712A	15.2	12.0	7.8	8,400	218214381
EA*5X25M17A	80VSL0701716B	15.2	12.0	7.8	8,400	218214379
EA*5X25M17A	80VSL0451412B	15.2	12.0	7.8	8,400	218214377
EA*5X25M17A	80MS(N,L)0901714A	15.2	12.0	7.8	8,400	218214376
EA*5X25M17A	80MS(N,L)0701716A	15.2	12.0	7.8	8,500	218214375

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.

Questions5

What is the SEER2 rating of the Heil B5H6S18*K*AAA?: The Heil B5H6S18*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 352 certified matchups SEER2 ranges from 15.2-15.5.
Is the Heil B5H6S18*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 Heil B5H6S18*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.
Which indoor units work with the Heil B5H6S18*K*AAA?: ENERGY STAR lists 352 certified combinations for this outdoor unit. The highest-rated ones use FMA5X24**AL, EVM5X32M17A, FM(C,U)5Z24**AL.
What refrigerant does the Heil B5H6S18*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 Heil B5H6S18*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

Grandaire W5H5S18*K*AAA15.5 SEER2 · 8.0 HSPF2
Carrier GH5SAN518**AA15.5 SEER2 · 8.0 HSPF2
Carrier 27SCA518A**3015.5 SEER2 · 8.0 HSPF2
Tempstar T5H6S18*K*AAA15.5 SEER2 · 8.0 HSPF2
Bryant PH5SAN518**AA15.5 SEER2 · 8.0 HSPF2
WeatherMaker PH5SAN518**AB15.5 SEER2 · 8.0 HSPF2
York YH518E2S1116.0 SEER2 · 7.8 HSPF2
DETTSON MHD-18 · cold climate15.2 SEER2 · 9.5 HSPF2

See all 170 1.5 ton central heat pumps, ranked

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