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C5H8T36*K*AAA*

C5H8T36*K*AAA* is in the certified data.

Its certified full-speed heating output at 5°F is 17,500–19,600 Btu/h, 45–51% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

Comfortmaker, Day & Night + 1 more · central heat pump

C5H8T36*K*AAA* is in the certified data as of Sep 19, 2026. C5H8T36*K*AAA* changed its certified heat output at 47°F on 3 pairings from 37,400 Btu/h to 37,600 Btu/h in the certified data between March 2025 and May 2025.

564 certified pairings with 109 different figures. See all

Heating at 47°F

38,000

23,600 at 17°F

19,000 at 5°F

Btu/h, certified

2.22 COP at 5°F

Cooling at 95°F

35,400

Btu/h, certified

EER2 11.7 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 C5H8T36*K*AAA*, by outdoor temperature Heating: 19,000 Btu/h at 5°F, 23,600 Btu/h at 17°F, 38,000 Btu/h at 47°F. Cooling: 35,400 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 19,000 5°F 23,600 17°F 38,000 47°F 35,400 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 38,000 Btu/h of heat at 47°F, 23,600 Btu/h at 17°F, and 19,000 Btu/h at 5°F, 50% of its 47°F rating. It delivers 35,400 Btu/h of cooling at 95°F. At 5°F that is 7,500 Btu/h short of the example heating load of 26,500 Btu/h; at 95°F it is 22,400 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 high stage; 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 216359650 · listed by Comfortmaker · certified Jul 16, 2026 · 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-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 −28% 2.22
17°Fone compressor speed 23,6006.92 kW −10% NR
47°Fone compressor speed 38,00011.14 kW +8% NR
95°Fcooling, full load 35,40010.37 kW — NR

EER2 11.7 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
2.51kW
Electrical input in the 95°F cooling test
3.03kW
Seasonal average heating COP
2.29

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
19,000 Btu/h
This unit at 5°F median across its pairings
19,000 Btu/h
Median of 3-ton central models at 5°F
26,400 Btu/h
Models in this group
451

This unit is above 26% of them, at number 334 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 C5H8T36*K*AAA*

564 pairings · 564 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 38,000 Btu/h 37,200–39,000 Btu/h
Heat output at 17°F full speed 23,600 Btu/h 23,000–24,200 Btu/h
Heat output at 5°F full speed 19,000 Btu/h 17,500–19,600 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 50%
COP at 5°F full speed 2.22 1.84–2.40
HSPF2 Region IV 7.8 7.8–8.5
Cooling
Cooling capacity at 95°F full-load test 35,400 Btu/h 33,800–38,000 Btu/h
EER2 at 95°F 11.7 11.7–13.0
SEER2 cooling season 15.2 15.2–16.5
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-454B
Compressor Two-stage
Indoor unit ESH5X42M12A* 25 indoor units
Furnace*80MSU0601716A* 42 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 C5H8T36*K*AAA*

Pairings, by indoor-unit class

25 indoor units · 564 certified pairings

One row per indoor unit certified with this outdoor unit.

Furnace paired · 10 indoor units

  1. EA*5X43M21A* brand not stated 19,300 Btu/hat 5°F, full speed

    69 pairings, 23 with a furnace · 47°F 38,500 Btu/h · 95°F cooling 35,800 Btu/h · Cold output 50% · COP 2.28

  2. EA*5X37M21A* brand not stated 19,300 Btu/hat 5°F, full speed

    63 pairings, 21 with a furnace · 47°F 38,500 Btu/h · 95°F cooling 35,800 Btu/h · Cold output 50% · COP 2.28

  3. EA*5X48M21A* brand not stated 19,150 Btu/hat 5°F, full speed

    60 pairings, 20 with a furnace · 47°F 38,000 Btu/h · 95°F cooling 35,200 Btu/h · Cold output 50% · COP 2.28

  4. EA*5X37M17A* brand not stated 18,900 Btu/hat 5°F, full speed

    39 pairings, 13 with a furnace · 47°F 37,600 Btu/h · 95°F cooling 34,600 Btu/h · Cold output 50% · COP 2.28

  5. ESH5X48M12A* brand not stated 19,100 Btu/hat 5°F, full speed

    39 pairings, 13 with a furnace · 47°F 38,000 Btu/h · 95°F cooling 35,600 Btu/h · Cold output 50% · COP 2.28

  6. EA*5X42M21A* brand not stated 18,800 Btu/hat 5°F, full speed

    33 pairings, 11 with a furnace · 47°F 37,600 Btu/h · 95°F cooling 34,600 Btu/h · Cold output 50% · COP 2.26

  7. EA*5X43M21A*+WALLCON brand not stated 19,300 Btu/hat 5°F, full speed

    30 pairings, 10 with a furnace · 47°F 38,500 Btu/h · 95°F cooling 35,800 Btu/h · Cold output 50% · COP 2.24

  8. EVD5X38M17A* brand not stated 17,750 Btu/hat 5°F, full speed

    30 pairings, 10 with a furnace · 47°F 38,500 Btu/h · 95°F cooling 37,000 Btu/h · Cold output 46% · COP 1.87

  9. EVD5X48M21A* brand not stated 17,700 Btu/hat 5°F, full speed

    30 pairings, 10 with a furnace · 47°F 38,500 Btu/h · 95°F cooling 36,800 Btu/h · Cold output 46% · COP 1.86

  10. EVM5X48M21A* brand not stated 17,700 Btu/hat 5°F, full speed

    30 pairings, 10 with a furnace · 47°F 38,500 Btu/h · 95°F cooling 36,800 Btu/h · Cold output 46% · COP 1.86

Indoor units in the furnace paired 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
EA*5X43M21A* — 19,300 38,500 35,800 50% 2.28 NC 69
EA*5X37M21A* — 19,300 38,500 35,800 50% 2.28 NC 63
EA*5X48M21A* — 19,150 38,000 35,200 50% 2.28 NC 60
EA*5X37M17A* — 18,900 37,600 34,600 50% 2.28 NC 39
ESH5X48M12A* — 19,100 38,000 35,600 50% 2.28 NC 39
EA*5X42M21A* — 18,800 37,600 34,600 50% 2.26 NC 33
EA*5X43M21A*+WALLCON — 19,300 38,500 35,800 50% 2.24 NC 30
EVD5X38M17A* — 17,750 38,500 37,000 46% 1.87 NC 30
EVD5X48M21A* — 17,700 38,500 36,800 46% 1.86 NC 30
EVM5X48M21A* — 17,700 38,500 36,800 46% 1.86 NC 30

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

Showing 10 of 25 indoor units All 564 certified pairings

Sold as, and units with identical certified values

Brands listing this model number

Other brands that list these model numbers

Model number as listed

  • C5H8T36*K*AAA* 564 pairings

Variants of the same model number

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

3 of 4 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

  • C5H8T36*K*AAA* changed its certified heat output at 47°F on 3 pairings from 37,400 Btu/h to 37,600 Btu/h in the certified data between March 2025 and May 2025.
  • C5H8T36*K*AAA* first appeared in the certified data between September 2024 and November 2024.

History and definitions

History

First certified record
Most recent certified record
Measurements reported
Jul 16, 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, “C5H8T36*K*AAA* — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/c5h8t36_stk_staaa_st