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YZT48B21

YZT48B21 is in the certified data.

Its certified full-speed heating output at 5°F is 19,000–27,000 Btu/h, 40–57% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

York · central heat pump

YZT48B21 is in the certified data as of Sep 19, 2026. YZT48B21 changed its certified SEER2 on 2 pairings from 17.0 to 16.0 in the certified data between November 2024 and February 2025.

18 certified pairings with 8 different figures. See all

Heating at 47°F

47,000

32,200 at 17°F

26,200 at 5°F

Btu/h, certified

2.32 COP at 5°F

Cooling at 95°F

46,000

Btu/h, certified

EER2 12.0 at 95°F

SEER2 16.0

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for YZT48B21, by outdoor temperature Heating: 26,200 Btu/h at 5°F, 32,200 Btu/h at 17°F, 47,000 Btu/h at 47°F. Cooling: 46,000 Btu/h at 95°F. The bars start at zero. Median of 4-ton central models: 36,400 Btu/h at 5°F, 35,000 Btu/h at 17°F, 48,000 Btu/h at 47°F, 48,000 Btu/h at 95°F. 0 10,000 20,000 30,000 40,000 50,000 Btu/h 26,200 5°F 32,200 17°F 47,000 47°F 46,000 95°F Outdoor temperature (°F)
  • Heating output
  • Cooling output
  • Median of 4-ton central models
  • Example heating load
  • Example cooling load
  • Frosting range, 17 to 45°F

This pairing delivers 47,000 Btu/h of heat at 47°F, 32,200 Btu/h at 17°F, and 26,200 Btu/h at 5°F, 56% of its 47°F rating. It delivers 46,000 Btu/h of cooling at 95°F. At 5°F that is 10,300 Btu/h short of the example heating load of 36,500 Btu/h; at 95°F it is 28,000 Btu/h above the example cooling load of 18,000 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 4-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 1,500 sq ft where winters reach 5°F: heating runs from 36,500 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 18,000 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 210279420 · listed by York · certified Jul 7, 2026 · 2 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 4-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 26,2007.68 kW −28% 2.32
17°Fone compressor speed 32,2009.44 kW −8% NR
47°Fone compressor speed 47,00013.77 kW −2% NR
95°Fcooling, full load 46,00013.48 kW — NR

EER2 12.0 in that test. SEER2 16.0 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test
3.31kW
Electrical input in the 95°F cooling test
3.83kW
Seasonal average heating COP
2.37

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 48,000 Btu heat pumps

4-ton central models

This pairing at 5°F
26,200 Btu/h
This unit at 5°F median across its pairings
26,200 Btu/h
Median of 4-ton central models at 5°F
36,400 Btu/h
Models in this group
408

This unit is above 26% of them, at number 302 of 408 by heat at 5°F. The middle half of the group runs 25,350 to 46,000 Btu/h.

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

Closest models by heat at 5°F

Every 48,000 Btu (4-ton) unit, ranked by cooling efficiency, then heating efficiency

Certified values for YZT48B21

18 pairings · 18 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 47,000 Btu/h 47,000–48,000 Btu/h
Heat output at 17°F full speed 32,200 Btu/h 31,600–33,000 Btu/h
Heat output at 5°F full speed 26,200 Btu/h 19,000–27,000 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 56%
COP at 5°F full speed 2.32 1.80–2.32
HSPF2 Region IV 8.1 8.1
Cooling
Cooling capacity at 95°F full-load test 46,000 Btu/h 45,500–47,500 Btu/h
EER2 at 95°F 12.0 11.7–12.5
SEER2 cooling season 16.0 16.0–17.0
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-410A
Compressor Two-stage
Indoor unit XAFD60HBCN1 5 indoor units
FurnaceTM8Y120C20MP11 5 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 YZT48B21

Pairings, by indoor-unit class

5 indoor units · 18 certified pairings

One row per indoor unit certified with this outdoor unit.

Furnace paired · 4 indoor units

  1. XAHC60HBCN1 brand not stated 25,600 Btu/hat 5°F, full speed

    5 pairings, 5 with a furnace · 47°F 48,000 Btu/h · 95°F cooling 46,000 Btu/h · Cold output 53% · COP 2.24

  2. XAFC60HBCN1 brand not stated 25,800 Btu/hat 5°F, full speed

    4 pairings, 4 with a furnace · 47°F 47,500 Btu/h · 95°F cooling 46,750 Btu/h · Cold output 54% · COP 2.22

  3. XAFD60HBCN1 brand not stated 26,400 Btu/hat 5°F, full speed

    4 pairings, 4 with a furnace · 47°F 47,000 Btu/h · 95°F cooling 46,000 Btu/h · Cold output 56% · COP 2.30

  4. XAHD60HBCN1 brand not stated 26,600 Btu/hat 5°F, full speed

    4 pairings, 4 with a furnace · 47°F 48,000 Btu/h · 95°F cooling 46,000 Btu/h · Cold output 55% · COP 2.27

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
XAHC60HBCN1 — 25,600 48,000 46,000 53% 2.24 NC 5
XAFC60HBCN1 — 25,800 47,500 46,750 54% 2.22 NC 4
XAFD60HBCN1 — 26,400 47,000 46,000 56% 2.30 NC 4
XAHD60HBCN1 — 26,600 48,000 46,000 55% 2.27 NC 4

Air handler · 1 indoor unit

  1. JHETD60HBCS2N1 brand not stated 19,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 47,000 Btu/h · 95°F cooling 46,500 Btu/h · Cold output 40% · COP 1.80

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
JHETD60HBCS2N1 — 19,000 47,000 46,500 40% 1.80 NC 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

Model number as listed

  • YZT48B21 18 pairings

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

  • YZT48B21 changed its certified SEER2 on 2 pairings from 17.0 to 16.0 in the certified data between November 2024 and February 2025.
  • YZT48B21 changed its certified HSPF2 on 5 pairings from 8.1 to 7.8 in the certified data between November 2024 and February 2025.
  • YZT48B21 changed its certified cooling capacity at 95°F on 5 pairings in the certified data between November 2024 and February 2025. The new figure is higher on 4 and lower on 1.
  • YZT48B21 changed its certified heat output at 47°F on 5 pairings in the certified data between November 2024 and February 2025. The new figure is lower on all 5.
  • YZT48B21 changed its certified heat output at 17°F on 5 pairings in the certified data between November 2024 and February 2025. The new figure is higher on 2 and lower on 3.
  • YZT48B21 was in the certified data by September 2024.

History and definitions

History

First certified record
Most recent certified record
Measurements reported
Jul 7, 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, “YZT48B21 — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/yzt48b21