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EL18KSLV-036-230A

EL18KSLV-036-230A is in the certified data.

Its certified full-speed heating output at 5°F is 27,600–30,800 Btu/h, 78–86% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

Lennox · central heat pump

EL18KSLV-036-230A is in the certified data as of Sep 19, 2026. EL18KSLV-036-230A changed its certified COP at 5°F on AHRI certificate 216581393 from 1.75 to 1.80 in the certified data between August 2025 and September 2026.

355 certified pairings with 271 different figures. See all

Heating at 47°F

35,600

28,800 at 17°F

28,400 at 5°F

Btu/h, certified

1.85 COP at 5°F

Cooling at 95°F

34,000

Btu/h, certified

EER2 11.0 at 95°F

SEER2 17.3

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for EL18KSLV-036-230A, by outdoor temperature Heating: 28,400 Btu/h at 5°F, 28,800 Btu/h at 17°F, 35,600 Btu/h at 47°F. Cooling: 34,000 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 28,400 5°F 28,800 17°F 35,600 47°F 34,000 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 35,600 Btu/h of heat at 47°F, 28,800 Btu/h at 17°F, and 28,400 Btu/h at 5°F, 80% of its 47°F rating. It delivers 34,000 Btu/h of cooling at 95°F. At 5°F that is 1,900 Btu/h above the example heating load of 26,500 Btu/h; at 95°F it is 21,000 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 216769583 · listed by Lennox · certified Jan 20, 2026 · 4 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 28,4008.32 kW +8% 1.85
17°Ffull speed 28,8008.44 kW +10% NR
47°Fnormal speed 35,60010.43 kW +1% NR
95°Fcooling, full load 34,0009.96 kW — NR

EER2 11.0 in that test. SEER2 17.3 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test
4.50kW
Electrical input in the 95°F cooling test
3.09kW
Seasonal average heating COP
2.49

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 36,000 Btu heat pumps

3-ton central models

This pairing at 5°F
28,400 Btu/h
This unit at 5°F median across its pairings
28,400 Btu/h
Median of 3-ton central models at 5°F
26,400 Btu/h
Models in this group
451

This unit is above 58% of them, at number 191 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 EL18KSLV-036-230A

355 pairings · 355 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 35,600 Btu/h 34,000–38,500 Btu/h
Heat output at 17°F full speed 28,800 Btu/h 27,000–29,600 Btu/h
Heat output at 5°F full speed 28,400 Btu/h 27,600–30,800 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 80%
COP at 5°F full speed 1.85 1.80–1.95
HSPF2 Region IV 8.5 8.1–9.6
Cooling
Cooling capacity at 95°F full-load test 34,000 Btu/h 32,200–36,200 Btu/h
EER2 at 95°F 11.0 10.0–12.0
SEER2 cooling season 17.3 15.2–19.3
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-454B
Compressor Variable speed
Indoor unit CK40[C,U]T-30B-**+TDR 27 indoor units
FurnaceEL297UH070XV36B* 106 furnaces
Cold-climate designation EPA's designation, as published Yes On every pairing
ENERGY STAR Most Efficient EPA's designation, as published Yes On some pairings
Where it is sold US and Canada US and Canada
Model string as certified EL18KSLV-036-230A**

Pairings, by indoor-unit class

27 indoor units · 355 certified pairings

One row per indoor unit certified with this outdoor unit.

Furnace paired · 1 indoor unit

  1. CK40[C,U]T-30B-**+TDR brand not stated 28,600 Btu/hat 5°F, full speed

    39 pairings, 39 with a furnace · 47°F 35,600 Btu/h · 95°F cooling 34,000 Btu/h · Cold output 80% · COP 1.80

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-30B-**+TDR — 28,600 35,600 34,000 80% 1.80 Yes 39

Air handler · 9 indoor units

  1. CK40HT-30B-**+TDR brand not stated 28,400 Btu/hat 5°F, full speed

    40 pairings, 39 with a furnace · 47°F 35,600 Btu/h · 95°F cooling 34,400 Btu/h · Cold output 80% · COP 1.85

  2. CK40HT-36B-**+TDR brand not stated 28,400 Btu/hat 5°F, full speed

    40 pairings, 39 with a furnace · 47°F 35,600 Btu/h · 95°F cooling 33,900 Btu/h · Cold output 80% · COP 1.85

  3. CK40[C,U]T-36B-**+TDR brand not stated 28,400 Btu/hat 5°F, full speed

    40 pairings, 39 with a furnace · 47°F 35,600 Btu/h · 95°F cooling 34,600 Btu/h · Cold output 79% · COP 1.85

  4. CK40[C,U]T-36C-**+TDR brand not stated 28,200 Btu/hat 5°F, full speed

    35 pairings, 34 with a furnace · 47°F 35,600 Btu/h · 95°F cooling 35,000 Btu/h · Cold output 79% · COP 1.85

  5. CK40DT-30/36B-**+TDR brand not stated 28,600 Btu/hat 5°F, full speed

    18 pairings, 17 with a furnace · 47°F 35,800 Btu/h · 95°F cooling 34,200 Btu/h · Cold output 80% · COP 1.85

  6. CK40DT-42B-**+TDR brand not stated 28,300 Btu/hat 5°F, full speed

    18 pairings, 17 with a furnace · 47°F 36,000 Btu/h · 95°F cooling 35,000 Btu/h · Cold output 79% · COP 1.90

  7. CK40HT-36C-**+TDR brand not stated 28,200 Btu/hat 5°F, full speed

    18 pairings, 17 with a furnace · 47°F 35,800 Btu/h · 95°F cooling 34,800 Btu/h · Cold output 79% · COP 1.90

  8. CK40[C,U]T-30/36C**+TDR brand not stated 28,400 Btu/hat 5°F, full speed

    17 pairings, 16 with a furnace · 47°F 35,600 Btu/h · 95°F cooling 34,200 Btu/h · Cold output 80% · COP 1.85

  9. CK40HT-30A-**+TDR brand not stated 28,400 Btu/hat 5°F, full speed

    16 pairings, 15 with a furnace · 47°F 35,800 Btu/h · 95°F cooling 34,200 Btu/h · Cold output 79% · COP 1.90

Indoor units in the air handler 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
CK40HT-30B-**+TDR — 28,400 35,600 34,400 80% 1.85 Yes 40
CK40HT-36B-**+TDR — 28,400 35,600 33,900 80% 1.85 Yes 40
CK40[C,U]T-36B-**+TDR — 28,400 35,600 34,600 79% 1.85 Yes 40
CK40[C,U]T-36C-**+TDR — 28,200 35,600 35,000 79% 1.85 Yes 35
CK40DT-30/36B-**+TDR — 28,600 35,800 34,200 80% 1.85 Yes 18
CK40DT-42B-**+TDR — 28,300 36,000 35,000 79% 1.90 Yes 18
CK40HT-36C-**+TDR — 28,200 35,800 34,800 79% 1.90 Yes 18
CK40[C,U]T-30/36C**+TDR — 28,400 35,600 34,200 80% 1.85 Yes 17
CK40HT-30A-**+TDR — 28,400 35,800 34,200 79% 1.90 Yes 16

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

Showing 10 of 27 indoor units All 355 certified pairings

Sold as, and units with identical certified values

Brands listing this model number

Model number as listed

  • EL18KSLV-036-230A** 355 pairings

Variants of the same model number

2 units in this group. Basis: identical certified values in the certified data. This grouping is our inference, not a field in the certified data.

1 of 2 shown.

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

  • EL18KSLV-036-230A changed its certified COP at 5°F on AHRI certificate 216581393 from 1.75 to 1.80 in the certified data between August 2025 and September 2026.
  • EL18KSLV-036-230A changed its certified heat output at 47°F on 265 pairings in the certified data between August 2025 and September 2026. The new figure is higher on all 265.
  • EL18KSLV-036-230A changed its certified heat output at 47°F on 8 pairings in the certified data between February 2025 and March 2025. The new figure is lower on all 8.
  • EL18KSLV-036-230A first appeared in the certified data between November 2024 and February 2025.

History and definitions

History

First certified record
Most recent certified record
Measurements reported
Jan 20, 2026
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, “EL18KSLV-036-230A — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/el18kslv-036-230a