What is the SEER2 rating of the York YZT48B21?

The York YZT48B21 is rated at up to 17.0 SEER2 and 12.5 EER2 for cooling and up to 8.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 18 certified matchups SEER2 ranges from 16.0-17.0.

Is the York YZT48B21 good for cold climates?

It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 4-ton model.

How much does the York YZT48B21 cost to run per year?

At its rated efficiency it costs about $1,276-$3,677 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,610 in Phoenix and $3,101 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Which indoor units work with the York YZT48B21?

ENERGY STAR lists 18 certified combinations for this outdoor unit. The highest-rated ones use XAHC60HBCN1, XAHD60HBCN1, JHETD60HBCS2N1.

What refrigerant does the York YZT48B21 use?

It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

4-ton central heat pump · AFFINITY

York YZT48B21

Average cooling efficiency and below average heating efficiency for a 4-ton central heat pump, but not rated for cold climates.

Ranks #187 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,512 a year to run in a mixed climate like Atlanta.

SEER2: 17.0 Cooling efficiency over a season
Average · beats 49%
HSPF2: 8.1 Heating efficiency over a season
Below average · beats 20%
EER2: 12.5 Cooling efficiency on a 95°F day
Very good · beats 80%
Heat at 5°F: 27,000 BTU/h53% of its 47°F output
Excellent · beats 90%

A good fit if…

You want a choice of indoor units - 18 certified pairings.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
You mainly need heat - its HSPF2 is below average for central heat pumps.
You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications4 ton, R-410A

General
Brand	York
Outdoor unit model	YZT48B21
Series	AFFINITY
Type	Central heat pump
Nominal size	4 ton
CompressorVariable-speed units run longer at low power	Two-stage
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	May 18, 2023
Last certified	July 7, 2026
Cooling
SEER2Seasonal efficiency, higher is better	17.0 (range 16.0-17.0)
EER2Efficiency at 95°F outdoors	11.7-12.5
Cooling capacity	45,500-47,500 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.1
Capacity at 47°F	47,000-48,000 BTU/h
Capacity at 17°F	31,600-33,000 BTU/h
Capacity at 5°F	19,000-27,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80-2.32
ENERGY STAR cold climate	No

Heating output as it gets colder53% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with XAHC60HBCN1 at the standard test temperatures, in BTU/h:

Certified matchups18 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. Ask your installer for the AHRI reference number of the exact system you are quoted.

Indoor unit	Furnace	SEER2	EER2	HSPF2	Heat @5°F	AHRI ref.
XAHC60HBCN1	TM8Y080C16MP11	17.0	12.5	8.1	25,600	209407717
XAHD60HBCN1	TM8Y120C20MP11	17.0	11.7	8.1	27,000	209407705
JHETD60HBCS2N1	-	17.0	12.5	8.1	19,000	208613061
XAHC60HBCN1	TM8Y100C16MP11	17.0	12.5	8.1	25,600	209407716
XAHC60HBCN1	TM8Y100C20MP11	17.0	11.7	8.1	27,000	209407710
XAHC60HBCN1	TM8Y120C20MP11	17.0	11.7	8.1	27,000	209407708
XAHD60HBCN1	TM8Y100C20MP11	17.0	11.7	8.1	27,000	209407707
XAHC60HBCN1	Y82E100C20LMPS1	17.0	12.0	8.1	24,000	211771245
XAFC60HBCN1	TM8Y120C20MP11	17.0	11.7	8.1	25,000	210279235
XAFC60HBCN1	TM8Y100C20MP11	17.0	11.7	8.1	25,000	210279236
XAHD60HBCN1	TM8Y100C16MP11	16.0	12.0	8.1	26,200	209407712
XAHD60HBCN1	TM8Y080C16MP11	16.0	12.0	8.1	26,200	209407714
XAFC60HBCN1	TM8Y080C16MP11	16.0	12.0	8.1	26,600	210279459
XAFC60HBCN1	TM8Y100C16MP11	16.0	12.0	8.1	26,600	210279458
XAFD60HBCN1	TM8Y100C16MP11	16.0	12.0	8.1	26,600	210279239
XAFD60HBCN1	TM8Y080C16MP11	16.0	12.0	8.1	26,600	210279241
XAFD60HBCN1	TM8Y100C20MP11	16.0	12.0	8.1	26,200	210279422
XAFD60HBCN1	TM8Y120C20MP11	16.0	12.0	8.1	26,200	210279420

Yearly running cost in 10 large cities$1,276-$3,677

Phoenix, AZ$1,610/yr
Miami, FL$1,276/yr
Houston, TX$1,444/yr
Atlanta, GA$1,512/yr
Los Angeles, CA$1,483/yr
New York, NY$3,677/yr
Chicago, IL$2,998/yr
Denver, CO$2,502/yr
Seattle, WA$1,545/yr
Minneapolis, MN$3,101/yr

At each state's average electricity price and the city's typical heating and cooling hours.

Questions5

What is the SEER2 rating of the York YZT48B21?: The York YZT48B21 is rated at up to 17.0 SEER2 and 12.5 EER2 for cooling and up to 8.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 18 certified matchups SEER2 ranges from 16.0-17.0.
Is the York YZT48B21 good for cold climates?: It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 4-ton model.
How much does the York YZT48B21 cost to run per year?: At its rated efficiency it costs about $1,276-$3,677 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,610 in Phoenix and $3,101 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Which indoor units work with the York YZT48B21?: ENERGY STAR lists 18 certified combinations for this outdoor unit. The highest-rated ones use XAHC60HBCN1, XAHD60HBCN1, JHETD60HBCS2N1.
What refrigerant does the York YZT48B21 use?: It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

Running cost and savings

Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

Heat pump $1,616/yrYou save $788/yrSee details ↓

1. Where you live

StateCityElectricity ¢ per kWh

Adjust heating and cooling hours

Filled in from your city's climate. Change them if you run the system much more or less than usual.

Cooling hours full-load hours per yearHeating hours full-load hours per year

2. The heat pump York YZT48B21

Find a model (fills in the ratings below)

SEER2 cooling efficiencyHSPF2 heating efficiencyCooling capacity BTU/hHeating capacity BTU/h

3. What it replaces

Current heatingFurnace efficiency (AFUE %)Gas price, $/thermCurrent coolingOld AC rating SEER2 (10 ≈ 15+ years old)

4. Price replace the example with your quote

Installed price, $Rebates and incentives, $ utility, state

Heat pump, per year: $1,616
Current system, per year: $2,405
You save per year: $788
Payback: 22.2 years
Net after 10 years: -$9,616

Cooling $952Heating $664Electricity used: 10,101 kWhSaved vs. a minimum-efficiency heat pump: $233

Estimates use the unit's rated SEER2 and HSPF2, full-load hours derived from NOAA 1991-2020 degree days, average residential electricity prices from the U.S. EIA (12 months to July 2026) and fuel prices from EIA (2025 for natural gas, week of 2026-10-05 for propane and heating oil). Very cold days that need backup heat are not modelled. Federal minimum for comparison: 14.3 SEER2 / 7.5 HSPF2.

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UTL UCHA-60HDCSN4 · cold climate16.7 SEER2 · 9.0 HSPF2
TCL THH60TEI2NAH0H24 · cold climate17.0 SEER2 · 8.2 HSPF2
VillaTherm VHPSD-UCHA-60HDCSN · cold climate16.7 SEER2 · 9.0 HSPF2
VillaTherm VHPSD-UCHA-60HDCSN4 · cold climate16.7 SEER2 · 9.0 HSPF2
TCL THH55TDI2NAF2H26 · cold climate17.0 SEER2 · 8.5 HSPF2

See all 319 4 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 7, 2026. How we use the data.