What is the SEER2 rating of the York YZT24B21?

The York YZT24B21 is rated at up to 18.0 SEER2 and 13.0 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 63 certified matchups SEER2 ranges from 16.0-18.0.

Is the York YZT24B21 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 2-ton model.

How much does the York YZT24B21 cost to run per year?

At its rated efficiency it costs about $604-$1,813 a year in electricity in large U.S. cities, depending on climate and local rates - for example $772 in Phoenix and $1,536 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 YZT24B21?

ENERGY STAR lists 63 certified combinations for this outdoor unit. The highest-rated ones use XAFB36DXXN1+TXV, XAFB36DBAN1, XAFA30DBAN1.

What refrigerant does the York YZT24B21 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.

2-ton central heat pump · AFFINITY

York YZT24B21

Average cooling efficiency and below average heating efficiency for a 2-ton central heat pump, but not rated for cold climates.

Ranks #190 of 331 2 ton central heat pumps for cooling efficiency, and costs about $739 a year to run in a mixed climate like Atlanta.

SEER2: 18.0 Cooling efficiency over a season
Average · beats 66%
HSPF2: 7.8 Heating efficiency over a season
Below average · beats 5%
EER2: 13.0 Cooling efficiency on a 95°F day
Very good · beats 89%
Heat at 5°F: 12,200 BTU/h47% of its 47°F output
Average · beats 51%

A good fit if…

You want a choice of indoor units - 63 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

Specifications2 ton, R-410A

General
Brand	York
Outdoor unit model	YZT24B21
Series	AFFINITY
Type	Central heat pump
Nominal size	2 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	18.0 (range 16.0-18.0)
EER2Efficiency at 95°F outdoors	11.7-14.0
Cooling capacity	21,200-24,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8
Capacity at 47°F	22,400-23,800 BTU/h
Capacity at 17°F	14,200-15,200 BTU/h
Capacity at 5°F	10,900-12,200 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80-2.06
ENERGY STAR cold climate	No

Heating output as it gets colder47% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with XAFB36DXXN1+TXV at the standard test temperatures, in BTU/h:

Certified matchups63 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 63 are shown. 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.
XAFB36DXXN1+TXV	Y82E080B12LMPS1	18.0	13.0	7.8	10,900	211770792
XAFB36DBAN1	Y82E080B12LMPS1	18.0	13.0	7.8	10,900	211770794
XAFB36DXXN1+TXV	Y81E100B12SMPS1	18.0	13.0	7.8	11,000	212475531
XAFB36DXXN1+TXV	Y81E100B12LMPS1	18.0	13.0	7.8	11,000	212475533
XAFB36DBAN1	Y81E100B12LMPS1	18.0	13.0	7.8	11,000	212475539
XAFB36DBAN1	Y81E100B12SMPS1	18.0	13.0	7.8	11,000	212475535
XAFB36DBAN1	TM8Y080B12MP11	17.0	13.5	7.8	11,000	209196066
XAFA30DBAN1	TM8Y060A12MP11	17.0	12.5	7.8	11,300	209194142
XAFB36DXXN1+TXV	TM8Y080B12MP11	17.0	13.5	7.8	11,000	207360855
XAFB36DBAN1+EUE10A	-	17.0	14.0	7.8	10,900	212956014
XAFB36DBAN1+EBE12A	-	17.0	14.0	7.8	10,900	212956009
XAFB36DBAN1+EBE10A	-	17.0	14.0	7.8	10,900	212956004
XAFB36DXXN1+EUE10A+TXV	-	17.0	14.0	7.8	10,900	212956000
XAFB36DXXN1+EBE10A+TXV	-	17.0	14.0	7.8	10,900	212955995
XAFB36DXXN1+EBE12A+TXV	-	17.0	14.0	7.8	10,900	212955997
XAFB36DBAN1+EUE20A	-	17.0	14.0	7.8	10,900	210295900
XAFB36DBAN1+EUE15A	-	17.0	14.0	7.8	10,900	210295896
XAFB36DBAN1+EBE20A	-	17.0	14.0	7.8	10,900	210295894
XAFB36DBAN1+EBE17A	-	17.0	14.0	7.8	10,900	210295892
XAFB36DBAN1+EBE15A	-	17.0	14.0	7.8	10,900	210295890
XAFB36DBAN1+EBE23A	-	17.0	14.0	7.8	10,900	210295886
XAFB36DXXN1+EUE20A+TXV	-	17.0	14.0	7.8	10,900	210295885
XAFB36DXXN1+EUE15A+TXV	-	17.0	14.0	7.8	10,900	210295883
XAFB36DXXN1+EBE20A+TXV	-	17.0	14.0	7.8	10,900	210295882
XAFB36DXXN1+EBE17A+TXV	-	17.0	14.0	7.8	10,900	210295881
XAFB36DXXN1+EBE15A+TXV	-	17.0	14.0	7.8	10,900	210295880
XAFB36DXXN1+EBE23A+TXV	-	17.0	14.0	7.8	10,900	210295878
XAHB36DBAN1	Y92E080B12SMPS1	17.0	12.0	7.8	11,500	211770732
XAFB36DBAN1	Y92E080B12SMPS1	17.0	12.0	7.8	11,500	211770736
XAFB36DBAN1	Y92E060B12SMPS1	17.0	12.0	7.8	11,800	211770746
XAFB36DBAN1	Y91E080B12SMPS1	17.0	13.0	7.8	11,100	211770761
XAHB36DBAN1	Y82E080B12LMPS1	17.0	13.0	7.8	10,900	211770790
XAFB36DXXN1+TXV	Y81E080B12SMPS1	17.0	13.0	7.8	10,900	211770806
XAFB36DBAN1	Y81E080B12SMPS1	17.0	13.0	7.8	10,900	211770808
XAHB36DBAN1	Y81E080B12SMPS1	17.0	13.0	7.8	10,900	211770804
XAFB36DBAN1	Y81E080B12LMPS1	17.0	13.0	7.8	10,900	212475969
XAFB36DXXN1+TXV	Y81E080B12LMPS1	17.0	13.0	7.8	10,900	212476008
XAHB36DBAN1	Y81E100B12SMPS1	17.0	13.0	7.8	11,000	212475087
XAHB36DBAN1	Y81E100B12LMPS1	17.0	13.0	7.8	11,000	212475089
XAHB36DBAN1	Y81E080B12LMPS1	17.0	13.0	7.8	10,900	212476135
XAFA30DBAN1	Y81E040A12LMPS1	17.0	12.5	7.8	11,000	212475759
XAFA30DBAN1	Y81E040A12SMPS1	17.0	12.5	7.8	11,000	212475756
XAHB36DBAN1	TP9C060B12MP13	16.0	12.0	7.8	11,200	209405519
XAHB36DBAN1	TM9E026A08MP12	16.0	12.0	7.8	11,100	209405526
XAHB36DBAN1	TM8Y080B12MP11	16.0	12.0	7.8	10,900	209405528
XAHB36DBAN1	YP9C060B12MP13	16.0	12.0	7.8	11,200	209405521
XAHB36DBAN1	TM9V060B12MP12	16.0	12.0	7.8	11,200	209405518
XAHB36DBAN1	TM8V080B12MP12	16.0	12.0	7.8	11,200	209405537
XAHB36DBAN1	TL9E060B12UH11	16.0	12.0	7.8	11,200	209405546
XAHB36DBAN1	YP9C080B12MP13	16.0	12.0	7.8	11,000	209405511
XAHB36DBAN1	TM9V080B12MP12	16.0	12.0	7.8	11,000	209405508
XAHB36DBAN1	TP9C080B12MP13	16.0	12.0	7.8	11,000	209405509
XAHB36DBAN1	TM9Y060B12MP11	16.0	12.0	7.8	11,000	210295869
XAHB36DBAN1	TM9E080B12MP12	16.0	12.0	7.8	11,000	210295867
XAHB36DBAN1	TM9Y080B12MP11	16.0	12.0	7.8	11,000	210295875
XAHB36DBAN1	TM9E060B12MP12	16.0	12.0	7.8	11,400	210295877
XAHB36DBAN1	Y92E060B12SMPS1	16.0	12.0	7.8	11,800	211770742
XAFA30DBAN1	Y92E040A10SMPS1	16.0	11.7	7.8	12,200	211770752
XAHB36DBAN1	Y91E060B12SMPS1	16.0	11.7	7.8	12,000	211770767
XAFA30DBAN1	Y91E060A10SMPS1	16.0	11.7	7.8	11,500	211770777

Yearly running cost in 10 large cities$604-$1,813

Phoenix, AZ$772/yr
Miami, FL$604/yr
Houston, TX$693/yr
Atlanta, GA$739/yr
Los Angeles, CA$728/yr
New York, NY$1,813/yr
Chicago, IL$1,481/yr
Denver, CO$1,239/yr
Seattle, WA$767/yr
Minneapolis, MN$1,536/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 YZT24B21?: The York YZT24B21 is rated at up to 18.0 SEER2 and 13.0 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 63 certified matchups SEER2 ranges from 16.0-18.0.
Is the York YZT24B21 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 2-ton model.
How much does the York YZT24B21 cost to run per year?: At its rated efficiency it costs about $604-$1,813 a year in electricity in large U.S. cities, depending on climate and local rates - for example $772 in Phoenix and $1,536 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 YZT24B21?: ENERGY STAR lists 63 certified combinations for this outdoor unit. The highest-rated ones use XAFB36DXXN1+TXV, XAFB36DBAN1, XAFA30DBAN1.
What refrigerant does the York YZT24B21 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 $780/yrYou save $406/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 YZT24B21

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: $780
Current system, per year: $1,186
You save per year: $406
Payback: 20.9 years
Net after 10 years: -$4,441

Cooling $450Heating $330Electricity used: 4,875 kWhSaved vs. a minimum-efficiency heat pump: $130

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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Breeze33 BZ33-INV24OUT2-J · cold climate17.5 SEER2 · 10.5 HSPF2
ZERO ZSOU-24HDG-HYPER18.0 SEER2 · 8.1 HSPF2
Multi MFG HHS-25HD-B · cold climate17.5 SEER2 · 10.0 HSPF2
GREE TU30-R32WGDU18.0 SEER2 · 8.3 HSPF2
Carrier 37MUHAQ24AA3+TIC2025-0016 · cold climate17.5 SEER2 · 9.5 HSPF2

See all 331 2 ton central heat pumps, ranked

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