Heat Pump List
Menu

Sections

Tools

LDT048H5E*1P

LDT048H5E*1P is in the certified data.

Its certified full-speed heating output at 5°F is 19,000 Btu/h, 43% of its 47°F rating across its certified pairings.

Allied Commercial and Lennox · central heat pump

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

LDT048H5E*1P is in the certified data as of Sep 19, 2026.

Heating at 47°F

44,000

25,000 at 17°F

19,000 at 5°F

Btu/h, certified

1.81 COP at 5°F

Cooling at 95°F

44,500

Btu/h, certified

EER2 12.0 at 95°F

SEER2 15.6

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for LDT048H5E*1P, by outdoor temperature Heating: 19,000 Btu/h at 5°F, 25,000 Btu/h at 17°F, 44,000 Btu/h at 47°F. Cooling: 44,500 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 19,000 5°F 25,000 17°F 44,000 47°F 44,500 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 44,000 Btu/h of heat at 47°F, 25,000 Btu/h at 17°F, and 19,000 Btu/h at 5°F, 43% of its 47°F rating. It delivers 44,500 Btu/h of cooling at 95°F. At 5°F that is 14,000 Btu/h short of the example heating load of 33,000 Btu/h; at 95°F it is 27,500 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 high stage; 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 216604663 · listed by Lennox · certified Jan 31, 2025 · 2 pairings on 2 certificates share these values

Rebates where you live

Meets the recorded equipment thresholds of 6 programs in 6 states, provinces, or territories:California (1), Idaho (1), Kansas (1), Michigan (2), Oregon (1), Newfoundland and Labrador (1).

All 6 programs by state and province

California

Idaho

Kansas

Michigan

Oregon

Newfoundland and Labrador

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 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 19,0005.57 kW −42% 1.81
17°Fone compressor speed 25,0007.33 kW −19% NR
47°Fone compressor speed 44,00012.90 kW 0% NR
95°Fcooling, full load 44,50013.04 kW — NR

EER2 12.0 in that test. SEER2 15.6 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test
3.08kW
Electrical input in the 95°F cooling test
3.71kW
Seasonal average heating COP
2.11

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 42,000 Btu heat pumps

3.5-ton central models

This pairing at 5°F
19,000 Btu/h
This unit at 5°F median across its pairings
19,000 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 5% of them, at number 212 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.

Among 42,000 Btu central models, each by its median certified pairing, highest first: 5°F output as a share of its 47°F rating, 221st of 222 (tied); HSPF2, 216th of 224 (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.

  • MVP-48-HP-C-230A00-O: The same 44,000 Btu/h rating at 47°F; 40,000 Btu/h at 5°F (this model: 19,000).
  • CU-M48BAHU: The same 44,000 Btu/h rating at 47°F; 39,000 Btu/h at 5°F (this model: 19,000).
  • LDT048H4E*1P: The same 44,000 Btu/h rating at 47°F; 36,400 Btu/h at 5°F (this model: 19,000).

Closest models by heat at 5°F

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

Floor area at the cold test point

The median certified output of 19,000 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 bandHouse conditionBtu/h per sq ftApproximate sq ft
MildDrafty, little insulation24–42450–790
MildTypical16–26730–1,190
MildTight, well insulated10–181,060–1,900
ColdDrafty, little insulation28–52370–680
ColdTypical18–30630–1,060
ColdTight, well insulated12–22860–1,580
Very coldDrafty, little insulation32–58330–590
Very coldTypical22–38500–860
Very coldTight, well insulated16–28680–1,190

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 LDT048H5E*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.

This pairingAll pairings
Heating
Heat output at 47°F high stage 44,000 Btu/h 44,000 Btu/h
Heat output at 17°F full speed 25,000 Btu/h 25,000 Btu/h
Heat output at 5°F full speed 19,000 Btu/h 19,000 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 43%
COP at 5°F full speed 1.81 1.81
HSPF2 Region IV 7.2 7.2
Cooling
Cooling capacity at 95°F full-load test 44,500 Btu/h 44,500 Btu/h
EER2 at 95°F 12.0 12.0
SEER2 cooling season 15.6 15.6
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-454B
Compressor Two-stage
Indoor unit None listed None
FurnaceNo 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 LDT048H5E*1P

Pairings, by indoor-unit class

2 certified pairings

One row per indoor unit certified with this outdoor unit.

Unspecified

  1. None listed brand not stated 19,000 Btu/hat 5°F, full speed

    2 pairings · 47°F 44,000 Btu/h · 95°F cooling 44,500 Btu/h · Cold output 43% · COP 1.81

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 — 19,000 44,000 44,500 43% 1.81 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

Model number as listed

  • LDT048H5E*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.

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.

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

  • LDT048H5E*1P first appeared in the certified data between November 2024 and February 2025.

History and definitions

Other E-SERIES models by nominal cooling size: LDT024H4E*1P (24,000 Btu), LDT036H4E*1P (36,000 Btu), LDT036H5E*1P (36,000 Btu), LDT048H4E*1P (42,000 Btu), LDT060H4E*1P (54,000 Btu), LDT060H5E*1P (54,000 Btu).

History

First certified record
Most recent certified record
Measurements reported
Jan 31, 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, “LDT048H5E*1P — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/ldt048h5e_st1p