What is the SEER2 rating of the Lennox EL18KSLV-036-230A?

The Lennox EL18KSLV-036-230A is rated at up to 19.3 SEER2 and 11.7 EER2 for cooling and up to 9.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 355 certified matchups SEER2 ranges from 15.2-19.3.

Is the Lennox EL18KSLV-036-230A good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 30,800 BTU/h at 5°F with a COP of 1.95, so it is still 2.0 times as efficient as electric resistance heat at that temperature.

How much does the Lennox EL18KSLV-036-230A cost to run per year?

At its rated efficiency it costs about $839-$2,323 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,045 in Phoenix and $1,949 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 Lennox EL18KSLV-036-230A?

ENERGY STAR lists 355 certified combinations for this outdoor unit. The highest-rated ones use CK40HT-42B-**+TDR, CBK48MVT-042-230-, CK40HT-36C-**+TDR.

3-ton central heat pump · Elite EL18KSLV Series

Lennox EL18KSLV-036-230A

Very good cooling and heating efficiency for a 3-ton central heat pump, and certified for cold climates.

Ranks #42 of 302 3 ton central heat pumps for cooling efficiency, and costs about $964 a year to run in a mixed climate like Atlanta.

SEER2: 19.3 Cooling efficiency over a season
Very good · beats 89%
HSPF2: 9.6 Heating efficiency over a season
Very good · beats 76%
EER2: 11.7 Cooling efficiency on a 95°F day
Average · beats 43%
Heat at 5°F: 30,800 BTU/h79% of its 47°F output
Below average · beats 27%

A good fit if…

You want low cooling bills - its SEER2 beats 89% of central heat pumps.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 30,800 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 76% of central heat pumps.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

Nothing stands out - its ratings have no weak spot for its class.

Calculate my running cost

Details

Specifications3 ton, R-454B

General
Brand	Lennox
Outdoor unit model	EL18KSLV-036-230A
Series	Elite EL18KSLV Series
Type	Central heat pump
Nominal size	3 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	October 29, 2024
Last certified	September 3, 2026
Cooling
SEER2Seasonal efficiency, higher is better	19.3 (range 15.2-19.3)
EER2Efficiency at 95°F outdoors	10.0-12.0
Cooling capacity	32,200-36,200 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.1-9.6
Capacity at 47°F	34,000-38,500 BTU/h
Capacity at 17°F	27,000-29,600 BTU/h
Capacity at 5°F	27,600-30,800 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80-1.95
ENERGY STAR cold climate	Yes

Heating output as it gets colder79% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CK40HT-42B-**+TDR at the standard test temperatures, in BTU/h:

Certified matchups355 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 355 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.
CK40HT-42B-**+TDR · cold climate	EL297UH070XV36B*	19.3	11.7	9.1	27,600	218672219
CBK48MVT-042-230- · cold climate	-	19.0	11.7	9.4	29,400	216618914
CK40HT-36C-**+TDR · cold climate	ML196UH090XE36C*	18.9	11.0	9.0	28,400	217449921
CK40[C,U]T-36C-**+TDR · cold climate	ML180UH110V60C*	18.8	11.0	8.5	28,200	218082917
CK40HT-36C-**+TDR · cold climate	ML193UH090XE36C*	18.7	11.0	9.0	28,200	217449922
CK40[C,U]T-36B-**+TDR · cold climate	EL280UH090E36B*	18.7	11.0	8.5	28,200	217449852
CK40HT-30A-**+TDR · cold climate	EL280UH045E36A*	18.6	11.0	9.0	28,400	217189835
CK40HT-36B-**+TDR · cold climate	EL280UH090E36B*	18.6	11.0	8.5	28,400	217449902
CK40HT-36C-**+TDR · cold climate	ML296UH090XV48C*	18.6	11.0	9.0	28,200	217449930
CK40HT-30B-**+TDR · cold climate	EL280UH090E36B*	18.6	11.0	8.5	28,400	217449877
CK40[C,U]T-36C-**+TDR · cold climate	ML296UH110XV60C*	18.6	11.0	8.5	28,400	218082924
CK40[C,U]T-36C-**+TDR · cold climate	ML196UH090XE36C*	18.6	11.0	8.5	28,200	218082922
CBK48MVT-036-230- · cold climate	-	18.5	11.0	9.4	29,400	216618913
CBK47UHET-036-230- · cold climate	-	18.5	11.0	9.4	29,400	216705371
CBK45UHET-036-230- · cold climate	-	18.5	11.7	9.0	30,000	216618909
CK40[C,U]T-36A-**+TDR · cold climate	EL280UH045E36A*	18.5	11.0	8.5	28,600	217189812
CK40[C,U]T-30/36C**+TDR · cold climate	ML196UH090XE36C*	18.5	10.0	8.5	28,600	217677937
CK40HT-36C-**+TDR · cold climate	EL297UH090XV48C*	18.4	11.7	9.0	28,200	217449926
CK40[C,U]T-36C-**+TDR · cold climate	SL280UH090XV60C*	18.4	11.0	8.5	28,200	218082927
CK40[C,U]T-36C-**+TDR · cold climate	SL280UH090V60C*	18.4	11.0	8.5	28,200	218082926
CK40HT-36C-**+TDR · cold climate	EL297UH110XV48C*	18.4	11.0	9.0	28,200	217449927
CK40[C,U]T-30/36C**+TDR · cold climate	ML193UH090XE36C*	18.4	10.0	8.5	28,400	217677938
CK40DT-42B-**+TDR · cold climate	ML193DF045XE36B*	18.3	11.0	9.0	28,200	217449943
CK40[C,U]T-30B-**+TDR · cold climate	EL280UH090E36B*	18.3	11.0	8.5	28,400	217449827
CK40[C,U]T-36B-**+TDR · cold climate	ML180UH070V48B*	18.3	11.7	8.5	28,200	217449868
CK40[C,U]T-36C-**+TDR · cold climate	SL280UH110XV60C*	18.3	11.0	8.5	28,400	218082930
CK40[C,U]T-36C-**+TDR · cold climate	SL280UH110V60C*	18.3	11.0	8.5	28,400	218082929
CK40[C,U]T-36C-**+TDR · cold climate	ML193UH090XE36C*	18.3	11.0	8.5	28,000	218082919
CK40HT-30B-**+TDR · cold climate	ML180UH070V48B*	18.3	11.0	8.5	28,400	217449893
CBK45UHVT-042-230- · cold climate	-	18.2	11.7	9.0	30,000	216618912
CK40HT-36C-**+TDR · cold climate	SLP99UH090XV36C*	18.2	11.0	9.0	28,400	217189875
CK40HT-36B-**+TDR · cold climate	ML180UH070V48B*	18.2	11.0	8.5	28,400	217449918
CK40[C,U]T-36C-**+TDR · cold climate	SLP99UH110XV60C*	18.2	11.0	8.5	28,200	218082936
CK40[C,U]T-30A-**+TDR · cold climate	EL280UH045E36A*	18.2	11.0	8.5	28,600	217189789
CK40[C,U]T-36C-**+TDR · cold climate	SL280UH080NV60C*	18.2	11.0	8.5	28,200	218082925
CK40[C,U]T-36C-**+TDR · cold climate	EL297UH110XV48C*	18.2	11.0	8.5	28,200	218082914
CBK43UHET-036-DV- · cold climate	-	18.1	10.9	9.6	30,200	218636321
CBK43UHET-030-DV- · cold climate	-	18.1	11.0	9.5	30,800	218636320
CK40HT-30A-**+TDR · cold climate	ML180UH045E36A*	18.1	11.0	9.0	28,200	217189837
CK40HT-30A-**+TDR · cold climate	ML180UH045XE36A*	18.1	11.0	9.0	28,200	217189838
CK40[C,U]T-36B-**+TDR · cold climate	SL280UH090V48B*	18.1	11.7	8.5	28,200	217189823
CK40[C,U]T-36B-**+TDR · cold climate	ML180UH070V36B*	18.1	11.0	8.5	28,200	217449853
CK40[C,U]T-36B-**+TDR · cold climate	SL280UH090V36B*	18.1	11.0	8.5	28,200	217449851
CK40[C,U]T-36B-**+TDR · cold climate	SL280UH090XV48B*	18.1	11.7	8.5	28,200	217449865
CK40[C,U]T-36C-**+TDR · cold climate	EL297UH110XV60C*	18.1	11.0	8.5	28,200	218082915
CK40[C,U]T-36C-**+TDR · cold climate	ML297UH110XV60C*	18.1	11.0	8.5	28,200	218730792
CK40HT-30B-**+TDR · cold climate	SL280UH090V48B*	18.1	11.7	8.5	28,200	217189846
CK40HT-36B-**+TDR · cold climate	SL280UH090V48B*	18.1	11.0	8.5	28,200	217189869
CK40[C,U]T-36B-**+TDR · cold climate	ML180UH070E36B*	18.1	11.0	8.5	28,400	217189816
CK40[C,U]T-36B-**+TDR · cold climate	ML180UH070XE36B*	18.1	11.0	8.5	28,400	217189817
CK40HT-30B-**+TDR · cold climate	SL280UH090XV48B*	18.1	11.7	8.5	28,200	217449890
CK40HT-36B-**+TDR · cold climate	SL280UH090XV48B*	18.1	11.0	8.5	28,200	217449915
CK40[C,U]T-36B-**+TDR · cold climate	ML193UH030XE36B*	18.1	11.0	8.5	28,600	217449860
CK40HT-30B-**+TDR · cold climate	SL280UH090V36B*	18.1	11.0	8.5	28,400	217449876
CBK45UHVT-036-230- · cold climate	-	18.0	11.7	9.5	30,000	216581389
CBK48MVT-030-230- · cold climate	-	18.0	11.0	9.5	29,600	217753035
CBK47UHET-042-230- · cold climate	-	18.0	12.0	9.4	29,000	216705372
CBK45UHET-042-230- · cold climate	-	18.0	11.7	9.0	30,000	216618911
CK40HT-36C-**+TDR · cold climate	EL297UH090XV36C*	18.0	11.0	9.0	28,400	216769596
CK40HT-36C-**+TDR · cold climate	ML297UH090XV36C*	18.0	11.0	9.0	28,400	218730764

Yearly running cost in 10 large cities$839-$2,323

Phoenix, AZ$1,045/yr
Miami, FL$839/yr
Houston, TX$937/yr
Atlanta, GA$964/yr
Los Angeles, CA$941/yr
New York, NY$2,323/yr
Chicago, IL$1,889/yr
Denver, CO$1,574/yr
Seattle, WA$969/yr
Minneapolis, MN$1,949/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 Lennox EL18KSLV-036-230A?: The Lennox EL18KSLV-036-230A is rated at up to 19.3 SEER2 and 11.7 EER2 for cooling and up to 9.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 355 certified matchups SEER2 ranges from 15.2-19.3.
Is the Lennox EL18KSLV-036-230A good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 30,800 BTU/h at 5°F with a COP of 1.95, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
How much does the Lennox EL18KSLV-036-230A cost to run per year?: At its rated efficiency it costs about $839-$2,323 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,045 in Phoenix and $1,949 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 Lennox EL18KSLV-036-230A?: ENERGY STAR lists 355 certified combinations for this outdoor unit. The highest-rated ones use CK40HT-42B-**+TDR, CBK48MVT-042-230-, CK40HT-36C-**+TDR.
What refrigerant does the Lennox EL18KSLV-036-230A 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 $1,043/yrYou save $751/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 Lennox EL18KSLV-036-230A

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: $1,043
Current system, per year: $1,793
You save per year: $751
Payback: 17.3 years
Net after 10 years: -$5,493

Cooling $627Heating $415Electricity used: 6,517 kWhSaved vs. a minimum-efficiency heat pump: $336

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.

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Trane/American Standard 5HPL9036A1000A19.5 SEER2 · 9.2 HSPF2
Midea MOVA-36HDN10-M20G · cold climate19.0 SEER2 · 10.0 HSPF2
Heil B5H0V36*K*AAA · cold climate19.5 SEER2 · 9.5 HSPF2
York YDC36E2D11 · cold climate19.0 SEER2 · 10.0 HSPF2
Day & Night C5H0V36*K*AAA · cold climate19.5 SEER2 · 9.5 HSPF2
Trane 5TCV0X48A1 · cold climate19.0 SEER2 · 9.7 HSPF2

See all 302 3 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 3, 2026. How we use the data.