WP15AZ42AJ2N

WP15AZ42AJ2N is in the certified data.

Its certified full-speed heating output at 5°F is 20,400 Btu/h, 52% of its 47°F rating across its certified pairings.

Fujitsu, Rheem + 2 more · central heat pump

WP15AZ42AJ2N is in the certified data as of Sep 19, 2026.

42,000 Btu (3.5-ton)
Central
Two-stage
US and Canada

Heating at 47°F

39,500

26,000 at 17°F

20,400 at 5°F

Btu/h, certified

2.10 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

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 39,500 Btu/h of heat at 47°F, 26,000 Btu/h at 17°F, and 20,400 Btu/h at 5°F, 52% of its 47°F rating. It delivers 40,000 Btu/h of cooling at 95°F. At 5°F that is 12,600 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 211627524 · listed by Rheem · certified Jun 3, 2026 · 10 pairings on 10 certificates 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	vs class median	COPat 5°F
5°Fone compressor speed	20,4005.98 kW	−38%	2.10
17°Fone compressor speed	26,0007.62 kW	−16%	NR
47°Fone compressor speed	39,50011.58 kW	−10%	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: 2.85kW
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: 20,400 Btu/h
This unit at 5°F median across its pairings: 20,400 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 30% of them, at number 156 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 WP15AZ42AJ2N

10 pairings · 10 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 WP15AZ42AJ2N
Heating
	This pairing	All pairings
Heat output at 47°F high stage	39,500 Btu/h	39,500 Btu/h
Heat output at 17°F full speed	26,000 Btu/h	26,000 Btu/h
Heat output at 5°F full speed	20,400 Btu/h	20,400 Btu/h
Heat output below 5°F	NR	NR
Cold output 5°F output as a % of the 47°F rating	52%	52% of its 47°F rating.
COP at 5°F full speed	2.10	2.10
HSPF2 Region IV	8.1	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
Cooling at other temperatures	NR	NR
Equipment and listing
Refrigerant	R-410A
Compressor	Two-stage
Indoor unit	RH2TZ4821STANN	5 indoor units
Furnace	No furnace	None
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	US and Canada	US and Canada
Model string as certified	WP15AZ42AJ2N

Pairings, by indoor-unit class

5 indoor units · 10 certified pairings

One row per indoor unit certified with this outdoor unit.

Air handler · 5 indoor units

WH2TZ4821STANN brand not stated 20,400 Btu/hat 5°F, full speed

3 pairings · 47°F 39,500 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 52% · COP 2.10
RH2TZ4821STANN (the pairing on screen) brand not stated 20,400 Btu/hat 5°F, full speed

2 pairings · 47°F 39,500 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 52% · COP 2.10
RH3VZ4821STACN brand not stated 20,400 Btu/hat 5°F, full speed

2 pairings · 47°F 39,500 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 52% · COP 2.10
WH3VZ4821STANN brand not stated 20,400 Btu/hat 5°F, full speed

2 pairings · 47°F 39,500 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 52% · COP 2.10
FHRNTT4821S*ZTNA brand not stated 20,400 Btu/hat 5°F, full speed

1 pairing · 47°F 39,500 Btu/h · 95°F cooling 40,000 Btu/h · Cold output 52% · 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
WH2TZ4821STANN	—	20,400	39,500	40,000	52%	2.10	Yes	3
RH2TZ4821STANN (the pairing on screen)	—	20,400	39,500	40,000	52%	2.10	Yes	2
RH3VZ4821STACN	—	20,400	39,500	40,000	52%	2.10	NC	2
WH3VZ4821STANN	—	20,400	39,500	40,000	52%	2.10	NC	2
FHRNTT4821S*ZTNA	—	20,400	39,500	40,000	52%	2.10	Yes	1

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

Showing 5 of 5 indoor units

Sold as, and units with identical certified values

Brands listing this model number

Other brands that list these model numbers

Model number as listed

WP15AZ42AJ2N 10 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.

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: Jun 3, 2026
Most recent certified record: Jun 3, 2026
Measurements reported: Jun 3, 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, “WP15AZ42AJ2N — certified heat output”. Certified figures dated Sep 19, 2026, checked daily.
https://heatpumplist.com/model/wp15az42aj2n

WP15AZ42AJ2N

Certified heating and cooling

Heating and cooling by outdoor temperature

Rebates where you live

Certified output and power use#