LDT024H4E*1P

LDT024H4E*1P is in the certified data.

Its certified full-speed heating output at 5°F is 23,800 Btu/h, 103% of its 47°F rating (tests at different compressor speeds) across its certified pairings.

Allied Commercial and Lennox · central heat pump

All 14 certified Allied Commercial models · All 152 certified Lennox models

LDT024H4E*1P is in the certified data as of Sep 19, 2026. LDT024H4E*1P returned to the certified data between August 2025 and September 2026.

24,000 Btu (2-ton)
Central
Two-stage
US and Canada

Heating at 47°F

23,000

17,000 at 17°F

23,800 at 5°F

Btu/h, certified

2.10 COP at 5°F

Cooling at 95°F

23,600

Btu/h, certified

EER2 11.4 at 95°F

SEER2 15.4

Heating and cooling by outdoor temperature

Heating output
Cooling output
Median of 2-ton central models
Example heating load
Example cooling load
Frosting range, 17 to 45°F

This pairing delivers 23,000 Btu/h of heat at 47°F, 17,000 Btu/h at 17°F, and 23,800 Btu/h at 5°F, 103% of its 47°F rating. It delivers 23,600 Btu/h of cooling at 95°F. At 5°F that is 4,800 Btu/h above the example heating load of 19,000 Btu/h; at 95°F it is 14,100 Btu/h above the example cooling load of 9,500 Btu/h.

Each bar is a separate certified test, drawn at its outdoor temperature, starting at zero. The 47°F figure is at high stage; the 17 and 5°F figures are at full speed. The short dark line on each bar is the median of 2-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 800 sq ft where winters reach 5°F: heating runs from 19,000 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 9,500 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 211198004 · listed by Lennox · certified Apr 22, 2026 · 2 pairings on 2 certificates share these values

Rebates where you live

Meets the recorded equipment thresholds of 5 programs in 5 states, provinces, or territories:Idaho (1), Kansas (1), Michigan (2), Oregon (1), Newfoundland and Labrador (1).

All 5 programs by state and province

Idaho

Idaho Power Heating and Cooling Efficiency Program

Kansas

Evergy Kansas Heating and Cooling Rebate · Evergy Kansas Central · Evergy Kansas Metro

Michigan

Oregon

Idaho Power Heating and Cooling Efficiency Program

Newfoundland and Labrador

takeCHARGE Oil to Electric Incentive Program · Newfoundland Power · Newfoundland and Labrador Hydro

Threshold comparisons use the unit’s median certified figures across its pairings, not the pairing selected above. Meeting these thresholds means the equipment may qualify; it does not guarantee approval. Service-area, installation, and product-list requirements also apply.

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 2-ton central models. Heating tests run at 70°F indoors. The cooling test runs at 80°F indoors.
Outdoor temperature	Certified outputBtu/h	vs class median	COPat 5°F
5°Ffull speed	23,8006.98 kW	+25%	2.10
17°Ffull speed	17,0004.98 kW	−11%	NR
47°Fhigh stage	23,0006.74 kW	−4%	NR
95°Fcooling, full load	23,6006.92 kW	—	NR

EER2 11.4 in that test. SEER2 15.4 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test: 3.32kW
Electrical input in the 95°F cooling test: 2.07kW
Seasonal average heating COP: 2.14

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 24,000 Btu heat pumps

2-ton central models

This pairing at 5°F: 23,800 Btu/h
This unit at 5°F median across its pairings: 23,800 Btu/h
Median of 2-ton central models at 5°F: 19,000 Btu/h
Models in this group: 565

This unit is above 86% of them, at number 79 of 565 by heat at 5°F. The middle half of the group runs 16,000 to 21,600 Btu/h.

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

Among 24,000 Btu central models, each by its median certified pairing, highest first: 5°F output as a share of its 47°F rating, 12th of 565 (tied); HSPF2, 557th of 578 (tied). Models without that figure are left out.

Similar ratings at 47°F

These central models share the nominal cooling size. Comparisons use each model’s median certified figures across pairings.

YZT24B21: The same 23,000 Btu/h rating at 47°F; 11,000 Btu/h at 5°F (this model: 23,800).
GLZS5BA2410A: The same 23,000 Btu/h rating at 47°F; 11,300 Btu/h at 5°F (this model: 23,800).
PHG6A240752X4: The same 23,000 Btu/h rating at 47°F; 12,100 Btu/h at 5°F (this model: 23,800).

Closest models by heat at 5°F

Every 24,000 Btu (2-ton) unit, ranked by cooling efficiency, then heating efficiency

Floor area at the cold test point

The median certified output of 23,800 Btu/h at 5°F matches the size calculator’s heating estimate for these floor areas, rounded to about 10 sq ft. Each range divides that output by the climate band’s heating rates.

Floor area by climate band and house condition
Climate band	House condition	Btu/h per sq ft	Approximate sq ft
Mild	Drafty, little insulation	24–42	570–990
Mild	Typical	16–26	920–1,490
Mild	Tight, well insulated	10–18	1,320–2,380
Cold	Drafty, little insulation	28–52	460–850
Cold	Typical	18–30	790–1,320
Cold	Tight, well insulated	12–22	1,080–1,980
Very cold	Drafty, little insulation	32–58	410–740
Very cold	Typical	22–38	630–1,080
Very cold	Tight, well insulated	16–28	850–1,490

This is an estimate, not a house-specific load calculation. Output stays at the 5°F test point for every band; it does not predict output at the band’s winter design temperature.

Certified values for LDT024H4E*1P

2 pairings · 2 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.

Certified values for LDT024H4E*1P
Heating
	This pairing	All pairings
Heat output at 47°F high stage	23,000 Btu/h	23,000 Btu/h
Heat output at 17°F full speed	17,000 Btu/h	17,000 Btu/h
Heat output at 5°F full speed	23,800 Btu/h	23,800 Btu/h
Heat output below 5°F	NR	NR
Cold output 5°F output as a % of the 47°F rating	103%	103% of its 47°F rating. Tests use different compressor speeds.
COP at 5°F full speed	2.10	2.10
HSPF2 Region IV	7.3	7.3
Cooling
Cooling capacity at 95°F full-load test	23,600 Btu/h	23,600 Btu/h
EER2 at 95°F	11.4	11.4
SEER2 cooling season	15.4	15.4
Cooling at other temperatures	NR	NR
Equipment and listing
Refrigerant	R-410A
Compressor	Two-stage
Indoor unit	None listed	None
Furnace	No furnace	None
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	LDT024H4E*1P

Pairings, by indoor-unit class

2 certified pairings

One row per indoor unit certified with this outdoor unit.

Unspecified

None listed (the pairing on screen) brand not stated 23,800 Btu/hat 5°F, full speed

2 pairings · 47°F 23,000 Btu/h · 95°F cooling 23,600 Btu/h · Cold output 103% · COP 2.10

Indoor units in the unspecified class
Indoor unit	Brand	At 5°FBtu/h · full speed	At 47°FBtu/h · high stage	At 95°FBtu/h · cooling	Cold output% of 47°F rating	COP 5°Ffull speed	Cold climate	Pairings
None listed (the pairing on screen)	—	23,800	23,000	23,600	103%	2.10	NC	2

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

Sold as, and units with identical certified values

Brands listing this model number

Other brands that list these model numbers

Are Allied Commercial and Lennox heat pumps the same?14 shared model numbers

Model number as listed

LDT024H4E*1P 2 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.

LHT024H4E*1PAllied Commercial · Lennox

1 of 2 shown.

Other model numbers with identical certified values

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

LHT024H4E*1Pidentical certified values

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

LDT024H4E*1P returned to the certified data between August 2025 and September 2026.
LDT024H4E*1P was last in the certified data in records from March 2025; it was not in the list on May 20, 2025.
LDT024H4E*1P was in the certified data by September 2024.

History and definitions

Other E-SERIES models by nominal cooling size: LDT036H4E*1P (36,000 Btu), LDT036H5E*1P (36,000 Btu), LDT048H4E*1P (42,000 Btu), LDT048H5E*1P (42,000 Btu), LDT060H4E*1P (54,000 Btu), LDT060H5E*1P (54,000 Btu).

History

First certified record: Apr 22, 2026
Most recent certified record: May 1, 2026
Measurements reported: Apr 22, 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, “LDT024H4E*1P — certified heat output”. Certified figures dated Sep 19, 2026, checked daily.
https://heatpumplist.com/model/ldt024h4e_st1p