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EL17XP1-036-230A

Lennox · central heat pump

EL17XP1-036-230A is in the certified data as of Sep 27, 2026. EL17XP1-036-230A changed its certified heat output at 17°F on 3 pairings in the certified data between September 2024 and November 2024. The new figure is higher on 2 and lower on 1.

570 certified pairings with 190 different figures. See all

Heating at 47°F

33,600

22,200 at 17°F

17,600 at 5°F

Btu/h, certified

2.18 COP at 5°F

Cooling at 95°F

36,000

Btu/h, certified

EER2 13.0 at 95°F

SEER2 16.2

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for EL17XP1-036-230A, by outdoor temperature Heating: 17,600 Btu/h at 5°F, 22,200 Btu/h at 17°F, 33,600 Btu/h at 47°F. Cooling: 36,000 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 17,600 5°F 22,200 17°F 33,600 47°F 36,000 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 33,600 Btu/h of heat at 47°F, 22,200 Btu/h at 17°F, and 17,600 Btu/h at 5°F, 52% of its 47°F rating. It delivers 36,000 Btu/h of cooling at 95°F. At 5°F that is 8,900 Btu/h short of the example heating load of 26,500 Btu/h; at 95°F it is 23,000 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 one 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 210293586 · listed by Lennox · certified Oct 27, 2025 · 6 pairings share these values

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°Fone compressor speed 17,6005.16 kW −33% 2.18
17°Fone compressor speed 22,2006.51 kW −15% NR
47°Fone compressor speed 33,6009.85 kW −5% NR
95°Fcooling, full load 36,00010.55 kW — NR

EER2 13.0 in that test. SEER2 16.2 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test
2.37kW
Electrical input in the 95°F cooling test
2.77kW
Seasonal average heating COP
2.34

These exclude backup resistance heat.

Updated Sep 27, 2026 · Methodology

How it compares with other 36,000 Btu heat pumps

3-ton central models

This pairing at 5°F
17,600 Btu/h
This unit at 5°F median across its pairings
17,600 Btu/h
Median of 3-ton central models at 5°F
26,400 Btu/h
Models in this group
451

This unit is above 17% of them, at number 375 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 EL17XP1-036-230A

570 pairings · 570 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 one speed 33,600 Btu/h 32,400–36,000 Btu/h
Heat output at 17°F full speed 22,200 Btu/h 21,400–24,000 Btu/h
Heat output at 5°F full speed 17,600 Btu/h 16,800–19,300 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 52%
COP at 5°F full speed 2.18 2.06–2.36
HSPF2 Region IV 8.0 7.8–8.7
Cooling
Cooling capacity at 95°F full-load test 36,000 Btu/h 34,800–36,000 Btu/h
EER2 at 95°F 13.0 12.2–13.5
SEER2 cooling season 16.2 15.2–16.8
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-410A
Compressor Single stage
Indoor unit CHX35-51/61C-**-*+TDR 40 indoor units
FurnaceSLP99UH090XV36C* 108 furnaces
Cold-climate designation EPA's designation, as published NC NC
ENERGY STAR Most Efficient EPA's designation, as published No On no pairings
Where it is sold US and Canada US and Canada
Model string as certified EL17XP1-036-230A**

Pairings, by indoor-unit class

40 indoor units · 570 certified pairings

One row per indoor unit certified with this outdoor unit.

Furnace paired · 10 indoor units

  1. CHX35-42C-**-*+TDR brand not stated 18,100 Btu/hat 5°F, full speed

    40 pairings, 40 with a furnace · 47°F 33,200 Btu/h · 95°F cooling 36,000 Btu/h · Cold output 54% · COP 2.20

  2. CHX35-51/61C-**-*+TDR brand not stated 17,600 Btu/hat 5°F, full speed

    40 pairings, 40 with a furnace · 47°F 33,400 Btu/h · 95°F cooling 36,000 Btu/h · Cold output 53% · COP 2.18

  3. CK40HT-42C-0*+TDR brand not stated 18,100 Btu/hat 5°F, full speed

    40 pairings, 40 with a furnace · 47°F 33,200 Btu/h · 95°F cooling 36,000 Btu/h · Cold output 54% · COP 2.20

  4. CK40HT-51/61C-0*+TDR brand not stated 17,600 Btu/hat 5°F, full speed

    40 pairings, 40 with a furnace · 47°F 33,400 Btu/h · 95°F cooling 36,000 Btu/h · Cold output 53% · COP 2.18

  5. C35-50/60C+TDR+TXV brand not stated 17,200 Btu/hat 5°F, full speed

    34 pairings, 34 with a furnace · 47°F 32,800 Btu/h · 95°F cooling 35,800 Btu/h · Cold output 52% · COP 2.12

  6. CX35-50/60C+TDR brand not stated 17,200 Btu/hat 5°F, full speed

    34 pairings, 34 with a furnace · 47°F 32,800 Btu/h · 95°F cooling 35,800 Btu/h · Cold output 52% · COP 2.12

  7. CHX35-48B-**-*+TDR brand not stated 17,400 Btu/hat 5°F, full speed

    31 pairings, 31 with a furnace · 47°F 33,400 Btu/h · 95°F cooling 35,800 Btu/h · Cold output 52% · COP 2.20

  8. CK40HT-48B-0*+TDR brand not stated 17,400 Btu/hat 5°F, full speed

    31 pairings, 31 with a furnace · 47°F 33,400 Btu/h · 95°F cooling 35,800 Btu/h · Cold output 52% · COP 2.20

  9. CHX35-42B-**-*+TDR brand not stated 18,600 Btu/hat 5°F, full speed

    30 pairings, 30 with a furnace · 47°F 33,600 Btu/h · 95°F cooling 36,000 Btu/h · Cold output 55% · COP 2.24

  10. CK40HT-42B-0*+TDR brand not stated 18,600 Btu/hat 5°F, full speed

    30 pairings, 30 with a furnace · 47°F 33,600 Btu/h · 95°F cooling 36,000 Btu/h · Cold output 55% · COP 2.24

Indoor units in the furnace paired class
Indoor unit Brand At 5°FBtu/h · full speed At 47°FBtu/h · one speed At 95°FBtu/h · cooling Cold output% of 47°F rating COP 5°Ffull speed Cold climate Pairings
CHX35-42C-**-*+TDR — 18,100 33,200 36,000 54% 2.20 NC 40
CHX35-51/61C-**-*+TDR — 17,600 33,400 36,000 53% 2.18 NC 40
CK40HT-42C-0*+TDR — 18,100 33,200 36,000 54% 2.20 NC 40
CK40HT-51/61C-0*+TDR — 17,600 33,400 36,000 53% 2.18 NC 40
C35-50/60C+TDR+TXV — 17,200 32,800 35,800 52% 2.12 NC 34
CX35-50/60C+TDR — 17,200 32,800 35,800 52% 2.12 NC 34
CHX35-48B-**-*+TDR — 17,400 33,400 35,800 52% 2.20 NC 31
CK40HT-48B-0*+TDR — 17,400 33,400 35,800 52% 2.20 NC 31
CHX35-42B-**-*+TDR — 18,600 33,600 36,000 55% 2.24 NC 30
CK40HT-42B-0*+TDR — 18,600 33,600 36,000 55% 2.24 NC 30

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

Showing 10 of 40 indoor units All 570 certified pairings

Sold as, and units with identical certified values

Brands listing this model number

Model number as listed

  • EL17XP1-036-230A** 570 pairings

Variants of the same model number

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

2 of 3 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

  • EL17XP1-036-230A changed its certified heat output at 17°F on 3 pairings in the certified data between September 2024 and November 2024. The new figure is higher on 2 and lower on 1.
  • EL17XP1-036-230A was in the certified data by September 2024.

History and definitions

History

First certified record
Most recent certified record
Measurements reported
Oct 27, 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, “EL17XP1-036-230A — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/ml17xp1-036-230a