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ML17XP1-042-230A

ML17XP1-042-230A is in the certified data.

Its certified full-speed heating output at 5°F is 10,400–22,000 Btu/h, 27–57% of its 47°F rating, depending on the pairing.

Lennox · central heat pump

ML17XP1-042-230A is in the certified data as of Sep 27, 2026. ML17XP1-042-230A changed its certified heat output at 17°F on AHRI certificate 214861239 from 25,800 Btu/h to 26,200 Btu/h in the certified data between September 2024 and November 2024.

206 certified pairings with 54 different figures. See all

Heating at 47°F

39,000

25,400 at 17°F

19,900 at 5°F

Btu/h, certified

2.08 COP at 5°F

Cooling at 95°F

41,000

Btu/h, certified

EER2 12.5 at 95°F

SEER2 15.2

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for ML17XP1-042-230A, by outdoor temperature Heating: 19,900 Btu/h at 5°F, 25,400 Btu/h at 17°F, 39,000 Btu/h at 47°F. Cooling: 41,000 Btu/h at 95°F. The bars start at zero. Median of 3.5-ton central models: 33,000 Btu/h at 5°F, 31,000 Btu/h at 17°F, 44,000 Btu/h at 47°F, 44,000 Btu/h at 95°F. 0 10,000 20,000 30,000 40,000 50,000 Btu/h 19,900 5°F 25,400 17°F 39,000 47°F 41,000 95°F Outdoor temperature (°F)
  • Heating output
  • Cooling output
  • Median of 3.5-ton central models
  • Example heating load
  • Example cooling load
  • Frosting range, 17 to 45°F

This pairing delivers 39,000 Btu/h of heat at 47°F, 25,400 Btu/h at 17°F, and 19,900 Btu/h at 5°F, 51% of its 47°F rating. It delivers 41,000 Btu/h of cooling at 95°F. At 5°F that is 13,100 Btu/h short of the example heating load of 33,000 Btu/h; at 95°F it is 24,000 Btu/h above the example cooling load of 17,000 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 3.5-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 1,400 sq ft where winters reach 5°F: heating runs from 33,000 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 17,000 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 210049461 · listed by Lennox · certified Oct 27, 2025 · 9 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 3.5-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 19,9005.83 kW −40% 2.08
17°Fone compressor speed 25,4007.44 kW −18% NR
47°Fone compressor speed 39,00011.43 kW −11% NR
95°Fcooling, full load 41,00012.02 kW — NR

EER2 12.5 in that test. SEER2 15.2 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test
2.80kW
Electrical input in the 95°F cooling test
3.28kW
Seasonal average heating COP
2.29

These exclude backup resistance heat.

Updated Sep 27, 2026 · Methodology

How it compares with other 42,000 Btu heat pumps

3.5-ton central models

This pairing at 5°F
19,900 Btu/h
This unit at 5°F median across its pairings
19,900 Btu/h
Median of 3.5-ton central models at 5°F
33,000 Btu/h
Models in this group
222

This unit is above 16% of them, at number 187 of 222 by heat at 5°F. The middle half of the group runs 20,000 to 40,000 Btu/h.

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

Closest models by heat at 5°F

Every 42,000 Btu (3.5-ton) unit, ranked by cooling efficiency, then heating efficiency

Certified values for ML17XP1-042-230A

206 pairings · 206 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 39,000 Btu/h 37,600–42,000 Btu/h
Heat output at 17°F full speed 25,400 Btu/h 25,000–27,800 Btu/h
Heat output at 5°F full speed 19,900 Btu/h 10,400–22,000 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 51%
COP at 5°F full speed 2.08 2.00–2.22
HSPF2 Region IV 7.8 7.8–8.3
Cooling
Cooling capacity at 95°F full-load test 41,000 Btu/h 40,000–42,000 Btu/h
EER2 at 95°F 12.5 12.5–13.0
SEER2 cooling season 15.2 15.2–15.6
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-410A
Compressor Single stage
Indoor unit C35-49C+TDR+TXV 29 indoor units
FurnaceEL196UH090XE48C* 43 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 ML17XP1-042-230A**

Pairings, by indoor-unit class

29 indoor units · 206 certified pairings

One row per indoor unit certified with this outdoor unit.

Furnace paired · 10 indoor units

  1. C35-49C+TDR+TXV brand not stated 19,900 Btu/hat 5°F, full speed

    23 pairings, 23 with a furnace · 47°F 39,000 Btu/h · 95°F cooling 41,500 Btu/h · Cold output 51% · COP 2.08

  2. CK40CT-49C-0*+TDR brand not stated 19,900 Btu/hat 5°F, full speed

    23 pairings, 23 with a furnace · 47°F 39,000 Btu/h · 95°F cooling 41,500 Btu/h · Cold output 51% · COP 2.08

  3. CX35-49C+TDR brand not stated 19,900 Btu/hat 5°F, full speed

    23 pairings, 23 with a furnace · 47°F 39,000 Btu/h · 95°F cooling 41,500 Btu/h · Cold output 51% · COP 2.08

  4. C35-48C+TDR+TXV brand not stated 19,700 Btu/hat 5°F, full speed

    21 pairings, 21 with a furnace · 47°F 39,500 Btu/h · 95°F cooling 41,500 Btu/h · Cold output 51% · COP 2.10

  5. CK40CT-48C-0*+TDR brand not stated 19,800 Btu/hat 5°F, full speed

    20 pairings, 20 with a furnace · 47°F 39,500 Btu/h · 95°F cooling 41,500 Btu/h · Cold output 51% · COP 2.10

  6. CX35-48C+TDR brand not stated 19,800 Btu/hat 5°F, full speed

    20 pairings, 20 with a furnace · 47°F 39,500 Btu/h · 95°F cooling 41,500 Btu/h · Cold output 51% · COP 2.10

  7. CHX35-42B-**-*+TDR brand not stated 20,000 Btu/hat 5°F, full speed

    12 pairings, 12 with a furnace · 47°F 38,000 Btu/h · 95°F cooling 41,250 Btu/h · Cold output 53% · COP 2.12

  8. CK40HT-42B-0*+TDR brand not stated 20,000 Btu/hat 5°F, full speed

    12 pairings, 12 with a furnace · 47°F 38,000 Btu/h · 95°F cooling 41,250 Btu/h · Cold output 53% · COP 2.12

  9. CHX35-48C-**-*+TDR brand not stated 20,200 Btu/hat 5°F, full speed

    8 pairings, 8 with a furnace · 47°F 39,000 Btu/h · 95°F cooling 41,000 Btu/h · Cold output 52% · COP 2.04

  10. CK40HT-48C-0*+TDR brand not stated 20,200 Btu/hat 5°F, full speed

    8 pairings, 8 with a furnace · 47°F 39,000 Btu/h · 95°F cooling 41,000 Btu/h · Cold output 52% · COP 2.04

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
C35-49C+TDR+TXV — 19,900 39,000 41,500 51% 2.08 NC 23
CK40CT-49C-0*+TDR — 19,900 39,000 41,500 51% 2.08 NC 23
CX35-49C+TDR — 19,900 39,000 41,500 51% 2.08 NC 23
C35-48C+TDR+TXV — 19,700 39,500 41,500 51% 2.10 NC 21
CK40CT-48C-0*+TDR — 19,800 39,500 41,500 51% 2.10 NC 20
CX35-48C+TDR — 19,800 39,500 41,500 51% 2.10 NC 20
CHX35-42B-**-*+TDR — 20,000 38,000 41,250 53% 2.12 NC 12
CK40HT-42B-0*+TDR — 20,000 38,000 41,250 53% 2.12 NC 12
CHX35-48C-**-*+TDR — 20,200 39,000 41,000 52% 2.04 NC 8
CK40HT-48C-0*+TDR — 20,200 39,000 41,000 52% 2.04 NC 8

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

Showing 10 of 29 indoor units All 206 certified pairings

Sold as, and units with identical certified values

Brands listing this model number

Model number as listed

  • ML17XP1-042-230A** 206 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

  • ML17XP1-042-230A changed its certified heat output at 17°F on AHRI certificate 214861239 from 25,800 Btu/h to 26,200 Btu/h in the certified data between September 2024 and November 2024.
  • ML17XP1-042-230A 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, “ML17XP1-042-230A — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/ml17xp1-042-230a