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EL21KLV-036-230A

EL21KLV-036-230A is in the certified data.

Its certified full-speed heating output at 5°F is 18,400–25,400 Btu/h, 56–79% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

Lennox · central heat pump

EL21KLV-036-230A is in the certified data as of Oct 2, 2026. EL21KLV-036-230A changed its certified SEER2 on AHRI certificate 217121567 from 16.0 to 18.0 in the certified data between August 2025 and September 2026.

299 certified pairings with 236 different figures. See all

Heating at 47°F

30,600

27,600 at 17°F

22,400 at 5°F

Btu/h, certified

2.46 COP at 5°F

Cooling at 95°F

33,200

Btu/h, certified

EER2 11.0 at 95°F

SEER2 17.0

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for EL21KLV-036-230A, by outdoor temperature Heating: 22,400 Btu/h at 5°F, 27,600 Btu/h at 17°F, 30,600 Btu/h at 47°F. Cooling: 33,200 Btu/h at 95°F. The bars start at zero. Median of 3-ton central models: 26,400 Btu/h at 5°F, 26,200 Btu/h at 17°F, 35,200 Btu/h at 47°F, 35,000 Btu/h at 95°F. 0 10,000 20,000 30,000 40,000 Btu/h 22,400 5°F 27,600 17°F 30,600 47°F 33,200 95°F Outdoor temperature (°F)
  • Heating output
  • Cooling output
  • Median of 3-ton central models
  • Example heating load
  • Example cooling load
  • Frosting range, 17 to 45°F

This pairing delivers 30,600 Btu/h of heat at 47°F, 27,600 Btu/h at 17°F, and 22,400 Btu/h at 5°F, 73% of its 47°F rating. It delivers 33,200 Btu/h of cooling at 95°F. At 5°F that is 4,100 Btu/h short of the example heating load of 26,500 Btu/h; at 95°F it is 20,200 Btu/h above the example cooling load of 13,000 Btu/h.

Each bar is a separate certified test, drawn at its outdoor temperature, starting at zero. The 47°F figure is at normal speed; the 17 and 5°F figures are at full speed. The short dark line on each bar is the median of 3-ton central models, one value per model. The shaded 17 to 45°F band is the frosting range: the outdoor coil can frost, and the unit pauses to defrost.

The dashed lines are example loads for a typical area of about 1,100 sq ft where winters reach 5°F: heating runs from 26,500 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 13,000 Btu/h at 95°F, at 1,000 sq ft per ton. A house in a hot climate or with large west-facing windows can need twice as much cooling. They are examples, not your building.

Calculate heating and cooling for your house

AHRI certificate 217443271 · listed by Lennox · certified Jul 3, 2025 · 2 pairings share these values

All rebate programs and their published thresholds

Certified output and power use

Certified output for the selected pairingThe four bars share one scale. The comparison is with the median of 3-ton central models. Heating tests run at 70°F indoors. The cooling test runs at 80°F indoors.
Outdoor temperature Certified outputBtu/h One scale vs class median COPat 5°F
5°Ffull speed 22,4006.56 kW −15% 2.46
17°Ffull speed 27,6008.09 kW +5% NR
47°Fnormal speed 30,6008.97 kW −13% NR
95°Fcooling, full load 33,2009.73 kW — NR

EER2 11.0 in that test. SEER2 17.0 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test
2.67kW
Electrical input in the 95°F cooling test
3.02kW
Seasonal average heating COP
2.64

These exclude backup resistance heat.

Updated Oct 2, 2026 · Methodology

How it compares with other 36,000 Btu heat pumps

3-ton central models

This pairing at 5°F
22,400 Btu/h
This unit at 5°F median across its pairings
22,400 Btu/h
Median of 3-ton central models at 5°F
26,400 Btu/h
Models in this group
451

This unit is above 33% of them, at number 301 of 451 by heat at 5°F. The middle half of the group runs 18,650 to 32,000 Btu/h.

This size class is defined by cooling capacity, so cooling is not compared here.

Closest models by heat at 5°F

Every 36,000 Btu (3-ton) unit, ranked by cooling efficiency, then heating efficiency

Certified values for EL21KLV-036-230A

299 pairings · 299 AHRI certificates

This pairing is the one shown above. Under all pairings, a single figure means every pairing agrees and a range means the pairing decides.

This pairingAll pairings
Heating
Heat output at 47°F normal speed 30,600 Btu/h 30,000–35,400 Btu/h
Heat output at 17°F full speed 27,600 Btu/h 26,600–32,400 Btu/h
Heat output at 5°F full speed 22,400 Btu/h 18,400–25,400 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 73%
COP at 5°F full speed 2.46 1.84–2.48
HSPF2 Region IV 9.0 8.5–10.4
Cooling
Cooling capacity at 95°F full-load test 33,200 Btu/h 31,800–34,800 Btu/h
EER2 at 95°F 11.0 11.0–12.2
SEER2 cooling season 17.0 15.2–20.0
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-454B
Compressor Variable speed
Indoor unit CK40HT-30B-**+TDR 18 indoor units
FurnaceEL280UH090E48B* 119 furnaces
Cold-climate designation EPA's designation, as published Yes On some pairings
ENERGY STAR Most Efficient EPA's designation, as published Yes On some pairings
Where it is sold United States US and Canada
Model string as certified EL21KLV-036-230A**

Pairings, by indoor-unit class

18 indoor units · 299 certified pairings

One row per indoor unit certified with this outdoor unit.

Furnace paired · 10 indoor units

  1. CK40[C,U]T-36C-**+TDR brand not stated 21,600 Btu/hat 5°F, full speed

    42 pairings, 42 with a furnace · 47°F 30,500 Btu/h · 95°F cooling 33,700 Btu/h · Cold output 71% · COP 2.06

  2. CK40HT-30B-**+TDR brand not stated 22,600 Btu/hat 5°F, full speed

    38 pairings, 38 with a furnace · 47°F 31,000 Btu/h · 95°F cooling 33,200 Btu/h · Cold output 73% · COP 2.42

  3. CK40[C,U]T-30B-**+TDR brand not stated 22,600 Btu/hat 5°F, full speed

    38 pairings, 38 with a furnace · 47°F 33,400 Btu/h · 95°F cooling 33,000 Btu/h · Cold output 68% · COP 2.26

  4. CK40HT-42C-**+TDR brand not stated 22,600 Btu/hat 5°F, full speed

    37 pairings, 37 with a furnace · 47°F 31,600 Btu/h · 95°F cooling 32,800 Btu/h · Cold output 72% · COP 1.92

  5. CK40[C,U]T-36B-**+TDR brand not stated 22,000 Btu/hat 5°F, full speed

    37 pairings, 37 with a furnace · 47°F 30,800 Btu/h · 95°F cooling 33,800 Btu/h · Cold output 71% · COP 2.04

  6. CK40HT-36C-**+TDR brand not stated 21,600 Btu/hat 5°F, full speed

    27 pairings, 27 with a furnace · 47°F 32,400 Btu/h · 95°F cooling 33,600 Btu/h · Cold output 67% · COP 2.04

  7. CK40[C,U]T-30A-**+TDR brand not stated 22,600 Btu/hat 5°F, full speed

    15 pairings, 15 with a furnace · 47°F 33,200 Btu/h · 95°F cooling 33,000 Btu/h · Cold output 68% · COP 2.26

  8. CK40[C,U]T-36A-**+TDR brand not stated 21,800 Btu/hat 5°F, full speed

    15 pairings, 15 with a furnace · 47°F 30,800 Btu/h · 95°F cooling 33,600 Btu/h · Cold output 71% · COP 2.04

  9. CK40HT-30A-**+TDR brand not stated 24,000 Btu/hat 5°F, full speed

    14 pairings, 14 with a furnace · 47°F 31,700 Btu/h · 95°F cooling 32,600 Btu/h · Cold output 76% · COP 1.96

  10. CK40DT-30/36C-**+TDR brand not stated 19,400 Btu/hat 5°F, full speed

    13 pairings, 13 with a furnace · 47°F 34,400 Btu/h · 95°F cooling 34,000 Btu/h · Cold output 56% · COP 2.32

Indoor units in the furnace paired class
Indoor unit Brand At 5°FBtu/h · full speed At 47°FBtu/h · normal speed At 95°FBtu/h · cooling Cold output% of 47°F rating COP 5°Ffull speed Cold climate Pairings
CK40[C,U]T-36C-**+TDR — 21,600 30,500 33,700 71% 2.06 Yes 42
CK40HT-30B-**+TDR — 22,600 31,000 33,200 73% 2.42 Yes 38
CK40[C,U]T-30B-**+TDR — 22,600 33,400 33,000 68% 2.26 NC 38
CK40HT-42C-**+TDR — 22,600 31,600 32,800 72% 1.92 Yes 37
CK40[C,U]T-36B-**+TDR — 22,000 30,800 33,800 71% 2.04 Yes 37
CK40HT-36C-**+TDR — 21,600 32,400 33,600 67% 2.04 NC 27
CK40[C,U]T-30A-**+TDR — 22,600 33,200 33,000 68% 2.26 NC 15
CK40[C,U]T-36A-**+TDR — 21,800 30,800 33,600 71% 2.04 Yes 15
CK40HT-30A-**+TDR — 24,000 31,700 32,600 76% 1.96 Yes 14
CK40DT-30/36C-**+TDR — 19,400 34,400 34,000 56% 2.32 NC 13

The share is heat output at 5°F divided by the 47°F rating.

Showing 10 of 18 indoor units All 299 certified pairings

Sold as, and units with identical certified values

Brands listing this model number

Model number as listed

  • EL21KLV-036-230A** 299 pairings

What affects the price

We don't have prices. These things drive the cost.

  • The size of the unit, and the indoor equipment on the same certificate.
  • Whether existing ductwork is reused, altered, or replaced.
  • The electrical work: a circuit, a disconnect, and sometimes a panel change.
  • Refrigerant line length and how the outdoor unit is mounted.
  • Permits and inspection, which vary by municipality.
  • Removing and disposing of the old equipment.
  • Local labor rates and how busy the season is.
  • Rebates and tax credits, which change and have deadlines.

Product history

  • EL21KLV-036-230A changed its certified SEER2 on AHRI certificate 217121567 from 16.0 to 18.0 in the certified data between August 2025 and September 2026.
  • EL21KLV-036-230A changed its certified COP at 5°F on 2 pairings in the certified data between August 2025 and September 2026. The new figure is higher on all 2.
  • EL21KLV-036-230A changed its certified cooling capacity at 95°F on 3 pairings in the certified data between August 2025 and September 2026. The new figure is higher on all 3.
  • EL21KLV-036-230A changed its certified heat output at 5°F on AHRI certificate 217443269 from 22,400 Btu/h to 22,600 Btu/h in the certified data between August 2025 and September 2026.
  • EL21KLV-036-230A changed its certified heat output at 47°F on AHRI certificate 217595417 from 34,000 Btu/h to 33,400 Btu/h in the certified data between August 2025 and September 2026.
  • EL21KLV-036-230A changed its certified heat output at 47°F on 5 pairings in the certified data between June 2025 and September 2026. The new figure is higher on 1 and lower on 4.
  • EL21KLV-036-230A changed its certified heat output at 17°F on AHRI certificate 217443222 from 27,200 Btu/h to 27,400 Btu/h in the certified data between August 2025 and September 2026.
  • EL21KLV-036-230A changed its certified SEER2 on 5 pairings in the certified data between June 2025 and August 2025. The new figure is lower on all 5.
  • EL21KLV-036-230A changed its certified HSPF2 on 8 pairings in the certified data between June 2025 and August 2025. The new figure is lower on all 8.
  • EL21KLV-036-230A changed its certified EER2 on 2 pairings from 11.2 to 11.0 in the certified data between June 2025 and August 2025.
  • EL21KLV-036-230A changed its certified COP at 5°F on 4 pairings in the certified data between June 2025 and August 2025. The new figure is lower on all 4.
  • EL21KLV-036-230A changed its certified cooling capacity at 95°F on 3 pairings in the certified data between June 2025 and August 2025. The new figure is lower on all 3.
  • EL21KLV-036-230A changed its certified heat output at 5°F on 7 pairings in the certified data between June 2025 and August 2025. The new figure is higher on all 7.
  • EL21KLV-036-230A changed its certified heat output at 47°F on at least 215 pairings in the certified data between June 2025 and August 2025. The new figure is higher on 65 and lower on 150.
  • EL21KLV-036-230A changed its certified heat output at 17°F on 3 pairings in the certified data between June 2025 and August 2025. The new figure is higher on all 3.
  • EL21KLV-036-230A first appeared in the certified data between March 2025 and May 2025.

History and definitions

History

First certified record
Most recent certified record
Measurements reported
Jul 3, 2025
Status
In the certified data

Field definitions

COP
Heat delivered for each unit of electricity used. A COP of 2.5 gives 2.5 times the heat of an electric baseboard heater.
HSPF2
Heating efficiency over a typical season. Higher uses less electricity.
SEER2
Cooling efficiency over a typical season. Higher uses less electricity.
EER2
Cooling output divided by electrical input in the 95°F full-load test, in Btu/h per watt.
Cold output
Heat output at 5°F as a percentage of the 47°F rating.
% of rating at 17°F
Heat output at 17°F as a percentage of the 47°F rating.

NR not in the certified dataNC not cold-climate certifiedSP single pairing onlyVP varies by pairing; see the pairings tableWD withdrawn since the certified data was last read

Cite or print this page

Heat Pump List, “EL21KLV-036-230A — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/el21klv-036-230a