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WP15AY42AJ2N

WP15AY42AJ2N is in the certified data.

Its certified full-speed heating output at 5°F is 18,200–21,000 Btu/h, 46–53% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

Fujitsu, Rheem + 2 more · central heat pump

WP15AY42AJ2N is in the certified data as of Sep 19, 2026.

328 certified pairings with 16 different figures. See all

Heating at 47°F

40,000

40,000 at 17°F

18,900 at 5°F

Btu/h, certified

2.00 COP at 5°F

Cooling at 95°F

40,000

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 WP15AY42AJ2N, by outdoor temperature Heating: 18,900 Btu/h at 5°F, 40,000 Btu/h at 17°F, 40,000 Btu/h at 47°F. Cooling: 40,000 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 18,900 5°F 40,000 17°F 40,000 47°F 40,000 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 40,000 Btu/h of heat at 47°F, 40,000 Btu/h at 17°F, and 18,900 Btu/h at 5°F, 47% of its 47°F rating. It delivers 40,000 Btu/h of cooling at 95°F. At 5°F that is 14,100 Btu/h short of the example heating load of 33,000 Btu/h; at 95°F it is 23,000 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 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 215655130 · listed by WeatherKing · certified Apr 9, 2025 · 20 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°Ffull speed 18,9005.54 kW −43% 2.00
17°Ffull speed 40,00011.72 kW +29% NR
47°Fhigh stage 40,00011.72 kW −9% NR
95°Fcooling, full load 40,00011.72 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
2.77kW
Electrical input in the 95°F cooling test
3.42kW
Seasonal average heating COP
2.37

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
18,900 Btu/h
This unit at 5°F median across its pairings
18,900 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 1% of them, at number 220 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 WP15AY42AJ2N

328 pairings · 328 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 40,000 Btu/h 40,000 Btu/h
Heat output at 17°F full speed 40,000 Btu/h 24,600–40,000 Btu/h
Heat output at 5°F full speed 18,900 Btu/h 18,200–21,000 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 47%
COP at 5°F full speed 2.00 2.00–2.20
HSPF2 Region IV 8.1 7.8–8.1
Cooling
Cooling capacity at 95°F full-load test 40,000 Btu/h 40,000 Btu/h
EER2 at 95°F 11.7 11.7
SEER2 cooling season 15.2 15.2–16.0
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-454B
Compressor Two-stage
Indoor unit TCFY4821STANM 12 indoor units
FurnaceW801W0755A21UH 123 furnaces
Cold-climate designation EPA's designation, as published Yes On some pairings
ENERGY STAR Most Efficient EPA's designation, as published No On no pairings
Where it is sold United States US and Canada
Model string as certified WP15AY42AJ2N

Pairings, by indoor-unit class

12 indoor units · 328 certified pairings

One row per indoor unit certified with this outdoor unit.

Furnace paired · 6 indoor units

  1. RCFY4824STANM brand not stated 18,850 Btu/hat 5°F, full speed

    104 pairings, 71 with a furnace · 47°F 40,000 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 47% · COP 2.00

  2. RCFY4821STANM brand not stated 19,100 Btu/hat 5°F, full speed

    93 pairings, 63 with a furnace · 47°F 40,000 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 48% · COP 2.00

  3. TCFY4824STANM brand not stated 18,850 Btu/hat 5°F, full speed

    34 pairings, 34 with a furnace · 47°F 40,000 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 47% · COP 2.00

  4. TCFY4821STANM brand not stated 19,100 Btu/hat 5°F, full speed

    31 pairings, 31 with a furnace · 47°F 40,000 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 48% · COP 2.00

  5. FCCN4824SYTA brand not stated 18,800 Btu/hat 5°F, full speed

    29 pairings, 29 with a furnace · 47°F 40,000 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 47% · COP 2.00

  6. FCCN4821SYTA brand not stated 19,000 Btu/hat 5°F, full speed

    27 pairings, 27 with a furnace · 47°F 40,000 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 48% · COP 2.00

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
RCFY4824STANM — 18,850 40,000 40,000 47% 2.00 Yes 104
RCFY4821STANM — 19,100 40,000 40,000 48% 2.00 Yes 93
TCFY4824STANM — 18,850 40,000 40,000 47% 2.00 Yes 34
TCFY4821STANM — 19,100 40,000 40,000 48% 2.00 Yes 31
FCCN4824SYTA — 18,800 40,000 40,000 47% 2.00 Yes 29
FCCN4821SYTA — 19,000 40,000 40,000 48% 2.00 Yes 27

Air handler · 4 indoor units

  1. RH2TY4821STANN brand not stated NRat 5°F, full speed

    2 pairings · 47°F 40,000 Btu/h · 95°F cooling 40,000 Btu/h · Cold output NR · COP —

  2. RH2TY4824STANN brand not stated 18,200 Btu/hat 5°F, full speed

    2 pairings · 47°F 40,000 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 46% · COP 2.10

  3. RH2VY4821STACN brand not stated 18,500 Btu/hat 5°F, full speed

    2 pairings · 47°F 40,000 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 46% · COP 2.00

  4. RH2VY4824STACN brand not stated 18,400 Btu/hat 5°F, full speed

    2 pairings · 47°F 40,000 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 46% · COP 2.10

Indoor units in the air handler 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
RH2TY4821STANN — NR 40,000 40,000 NR — NC 2
RH2TY4824STANN — 18,200 40,000 40,000 46% 2.10 Yes 2
RH2VY4821STACN — 18,500 40,000 40,000 46% 2.00 Yes 2
RH2VY4824STACN — 18,400 40,000 40,000 46% 2.10 Yes 2

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

Showing 10 of 12 indoor units All 328 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

  • WP15AY42AJ2N 328 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.

History and definitions

History

First certified record
Most recent certified record
Measurements reported
Apr 9, 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, “WP15AY42AJ2N — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/wp15ay42aj2n