What is the SEER2 rating of the Lennox EL21KLV-024-230A?

The Lennox EL21KLV-024-230A is rated at up to 21.0 SEER2 and 13.5 EER2 for cooling and up to 10.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 178 certified matchups SEER2 ranges from 15.2-21.0.

Is the Lennox EL21KLV-024-230A good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,600 BTU/h at 5°F with a COP of 2.30, so it is still 2.3 times as efficient as electric resistance heat at that temperature.

How much does the Lennox EL21KLV-024-230A cost to run per year?

At its rated efficiency it costs about $525-$1,490 a year in electricity in large U.S. cities, depending on climate and local rates - for example $659 in Phoenix and $1,254 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 EL21KLV-024-230A?

ENERGY STAR lists 178 certified combinations for this outdoor unit. The highest-rated ones use CK40HT-24B-**+TDR, CBK48MVT-030-230-, CBK48MVT-018/024-230-.

2-ton central heat pump · Elite EL21KLV SERIES

Lennox EL21KLV-024-230A

Excellent cooling and heating efficiency for a 2-ton central heat pump, and certified for cold climates.

Ranks #8 of 331 2 ton central heat pumps for cooling efficiency, and costs about $615 a year to run in a mixed climate like Atlanta.

SEER2: 21.0 Cooling efficiency over a season
Excellent · beats 97%
HSPF2: 10.2 Heating efficiency over a season
Excellent · beats 91%
EER2: 13.5 Cooling efficiency on a 95°F day
Excellent · beats 95%
Heat at 5°F: 18,600 BTU/h75% of its 47°F output
Very good · beats 88%

A good fit if…

You want low cooling bills - its SEER2 beats 97% of central heat pumps.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 18,600 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 91% 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

Specifications2 ton, R-454B

General
Brand	Lennox
Outdoor unit model	EL21KLV-024-230A
Series	Elite EL21KLV SERIES
Type	Central heat pump
Nominal size	2 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	March 7, 2025
Last certified	September 30, 2026
Cooling
SEER2Seasonal efficiency, higher is better	21.0 (range 15.2-21.0)
EER2Efficiency at 95°F outdoors	11.2-13.5
Cooling capacity	21,600-24,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.1-10.2
Capacity at 47°F	23,600-27,400 BTU/h
Capacity at 17°F	18,700-22,400 BTU/h
Capacity at 5°F	13,900-18,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.70-2.30
ENERGY STAR cold climate	Yes

Heating output as it gets colder75% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CK40HT-24B-**+TDR at the standard test temperatures, in BTU/h:

Certified matchups178 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 178 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-24B-**+TDR · cold climate	ML197UH030XE36B*	21.0	13.5	8.2	18,100	218745112
CBK48MVT-030-230- · cold climate	-	20.5	12.0	10.0	17,900	217115278
CBK48MVT-018/024-230- · cold climate	-	20.5	13.0	10.0	18,600	217115280
CBK47UHET-024-230- · cold climate	-	20.5	13.0	9.8	18,600	217121964
CBK47UHET-030-230- · cold climate	-	20.5	13.0	9.8	17,900	217121963
CK40HT-30A-**+TDR	EL280UH045E36A*	20.5	12.5	9.0	16,700	217443193
CBK45UHVT-030-230- · cold climate	-	20.5	13.0	8.5	17,800	217121962
CK40DT-30/36C-**+TDR	SLP99DF090XV36C*	20.5	13.0	8.5	16,200	217443154
CK40[C,U]T-30B-**+TDR · cold climate	SL297UH040NV36B*	20.0	12.8	10.0	17,700	217115288
CK40[C,U]T-30A-**+TDR · cold climate	EL180UH040NE36A*	20.0	12.6	9.8	17,600	217121529
CK40[C,U]T-30A-**+TDR · cold climate	EL180UH060NE36A*	20.0	12.6	9.8	17,600	217121530
CBK45UHVT-024-230-	-	20.0	13.0	9.8	17,300	217443134
CK40[C,U]T-30A-**+TDR · cold climate	ML180UH070V36A*	20.0	13.0	9.6	17,400	217121548
CK40[C,U]T-30B-**+TDR · cold climate	ML180UH070V36B*	20.0	13.0	9.6	17,400	217121549
CK40[C,U]T-30B-**+TDR · cold climate	ML180UH090V48B*	20.0	12.6	9.6	17,700	217121553
CK40HT-30B-**+TDR · cold climate	SL280UH090V36B*	20.0	13.0	9.4	17,000	217443174
CK40HT-30B-**+TDR · cold climate	SL297UH040NV36B*	20.0	13.0	9.4	17,100	217443176
CK40HT-30B-**+TDR · cold climate	SL297UH060NV36B*	20.0	13.0	9.4	17,100	217443177
CK40HT-30B-**+TDR · cold climate	SLP99UH070XV36B*	20.0	13.0	9.4	17,000	217443178
CK40HT-30B-**+TDR	EL297UH070XV36B*	20.0	13.0	9.4	17,000	217443185
CK40HT-30B-**+TDR · cold climate	ML180UH070V36B*	20.0	13.0	9.0	16,900	217443162
CK40HT-30B-**+TDR · cold climate	ML180UH090V48B*	20.0	13.0	9.0	17,100	217443166
CK40HT-30A-**+TDR	SL280UH060NV36A*	20.0	12.5	9.0	17,100	217443201
CK40DT-30/36B-**+TDR	SL280DF090V48B*	20.0	12.5	8.5	16,300	217443143
CK40DT-30/36B-**+TDR	EL297DF045XV36B*	20.0	12.5	8.5	16,200	217443144
CK40DT-30/36B-**+TDR	SLP99DF070XV36B*	20.0	12.5	8.5	16,300	217443145
CK40HT-30B-**+TDR · cold climate	ML180UH070V48B*	20.0	13.0	8.5	16,900	217443164
CK40HT-24A-**+TDR · cold climate	EL180UH040NE36A*	20.0	13.0	8.5	17,500	217443186
CK40HT-24A-**+TDR · cold climate	EL280UH070XE36A*	20.0	13.0	8.5	17,600	217443187
CK40HT-24A-**+TDR · cold climate	EL180UH060NE36A*	20.0	13.0	8.5	17,500	217443188
CK40HT-24A-**+TDR · cold climate	EL280UH070E36A*	20.0	13.0	8.5	17,600	217443189
CK40HT-24B-**+TDR · cold climate	ML197UH060XE36B*	20.0	13.5	8.5	18,400	218747720
CK40HT-24A-**+TDR · cold climate	ML180UH030V36A*	20.0	13.0	8.2	17,300	217443190
CBK45UHET-024-230-	-	19.5	13.0	10.2	17,300	217443135
CK40[C,U]T-30A-**+TDR · cold climate	SL280UH060NV36A*	19.5	13.0	10.0	17,600	217115281
CK40[C,U]T-30B-**+TDR · cold climate	SL297UH060NV36B*	19.5	12.8	9.8	17,700	217115289
CK40[C,U]T-30A-**+TDR · cold climate	EL280UH045E36A*	19.5	13.0	9.8	17,300	217121537
CK40[C,U]T-30A-**+TDR · cold climate	EL280UH070E36A*	19.5	12.6	9.8	17,700	217121538
CK40[C,U]T-30A-**+TDR · cold climate	EL280UH070XE36A*	19.5	12.6	9.8	17,700	217121539
CK40[C,U]T-30B-**+TDR · cold climate	ML193UH045XE36B*	19.5	12.6	9.8	17,700	217121554
CK40[C,U]T-30B-**+TDR · cold climate	ML193UH070XE36B*	19.5	12.8	9.8	17,700	217121555
CK40[C,U]T-30A-**+TDR · cold climate	ML180UH030V36A*	19.5	13.0	9.6	17,400	217121544
CK40[C,U]T-30B-**+TDR · cold climate	ML296UH070XV36B*	19.5	12.8	9.6	17,500	217121560
CK40[C,U]T-30A-**+TDR · cold climate	ML180UH045V36A*	19.5	13.0	9.5	17,300	217121545
CK40[C,U]T-30B-**+TDR · cold climate	ML296UH045XV36B*	19.5	12.8	9.5	17,400	217121559
CK40HT-30B-**+TDR · cold climate	SL280UH090V48B*	19.5	13.0	9.4	17,000	217443175
CK40HT-30B-**+TDR · cold climate	SL280UH090XV48B*	19.5	13.0	9.4	17,000	217443179
CK40HT-30B-**+TDR · cold climate	EL297UH045XV36B*	19.5	13.0	9.4	17,100	217443184
CK40[C,U]T-30B-**+TDR · cold climate	ML180UH070V48B*	19.5	13.0	9.0	17,400	217121550
CK40HT-30B-**+TDR · cold climate	ML193UH045XE36B*	19.5	13.0	9.0	17,200	217443167
CK40HT-30B-**+TDR · cold climate	ML193UH070XE36B*	19.5	13.0	9.0	17,100	217443168
CK40HT-30B-**+TDR · cold climate	ML296UH045XV36B*	19.5	13.0	9.0	16,900	217443171
CK40HT-30B-**+TDR · cold climate	SL280UH080NV48B*	19.5	13.0	9.0	17,200	217443173
CK40HT-30A-**+TDR	EL280UH070E36A*	19.5	12.0	9.0	17,200	217443194
CK40HT-30A-**+TDR	EL280UH070XE36A*	19.5	12.0	9.0	17,200	217443195
CK40HT-30A-**+TDR	SL280UH070V36A*	19.5	12.5	9.0	17,100	217443202
CK40HT-30A-**+TDR	SL280UH070XV36A*	19.5	12.5	9.0	17,100	217443203
CK40[C,U]T-24B-**+TDR	SL297UH040NV36B*	19.5	13.0	8.5	14,200	217443096
CK40[C,U]T-24B-**+TDR	SL280UH090V36B*	19.5	13.0	8.5	14,100	217443125
CK40DT-30/36B-**+TDR	ML193DF045XE36B*	19.5	12.5	8.5	16,300	217443138

Yearly running cost in 10 large cities$525-$1,490

Phoenix, AZ$659/yr
Miami, FL$525/yr
Houston, TX$591/yr
Atlanta, GA$615/yr
Los Angeles, CA$602/yr
New York, NY$1,490/yr
Chicago, IL$1,213/yr
Denver, CO$1,012/yr
Seattle, WA$624/yr
Minneapolis, MN$1,254/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 EL21KLV-024-230A?: The Lennox EL21KLV-024-230A is rated at up to 21.0 SEER2 and 13.5 EER2 for cooling and up to 10.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 178 certified matchups SEER2 ranges from 15.2-21.0.
Is the Lennox EL21KLV-024-230A good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,600 BTU/h at 5°F with a COP of 2.30, so it is still 2.3 times as efficient as electric resistance heat at that temperature.
How much does the Lennox EL21KLV-024-230A cost to run per year?: At its rated efficiency it costs about $525-$1,490 a year in electricity in large U.S. cities, depending on climate and local rates - for example $659 in Phoenix and $1,254 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 EL21KLV-024-230A?: ENERGY STAR lists 178 certified combinations for this outdoor unit. The highest-rated ones use CK40HT-24B-**+TDR, CBK48MVT-030-230-, CBK48MVT-018/024-230-.
What refrigerant does the Lennox EL21KLV-024-230A 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 $660/yrYou save $563/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 EL21KLV-024-230A

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: $660
Current system, per year: $1,223
You save per year: $563
Payback: 16.0 years
Net after 10 years: -$3,372

Cooling $392Heating $268Electricity used: 4,126 kWhSaved vs. a minimum-efficiency heat pump: $280

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

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LG KUSXB241A · cold climate21.0 SEER2 · 10.2 HSPF2
SAMYOU VUH24-VA6BA(O) · cold climate21.0 SEER2 · 11.0 HSPF2
Daikin DH9VSA241CA · cold climate21.0 SEER2 · 10.0 HSPF2
GE NS22H24MA4-**A22.0 SEER2 · 9.5 HSPF2
Friedrich FRP19AY24AJVC · cold climate21.0 SEER2 · 10.0 HSPF2
Trane 5TWV0X24A1 · cold climate22.4 SEER2 · 10.0 HSPF2
Goodman GZV9SA241CA · cold climate21.0 SEER2 · 10.0 HSPF2

See all 331 2 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 30, 2026. How we use the data.