What is the SEER2 rating of the York YH636E2S11?

The York YH636E2S11 is rated at up to 17.0 SEER2 and 12.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 496 certified matchups SEER2 ranges from 15.2-17.0.

Is the York YH636E2S11 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 3-ton model.

How much does the York YH636E2S11 cost to run per year?

At its rated efficiency it costs about $946-$2,575 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,173 in Phoenix and $2,156 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 YH636E2S11?

ENERGY STAR lists 496 certified combinations for this outdoor unit. The highest-rated ones use CTF48C5CFS1+JMET12CS2N1, CTU48C5XFS1+JMET12CS2N1+TXV, CTF48C5CFS1+JMC16C2SN1.

3-ton central heat pump · LX SERIES

York YH636E2S11

Average cooling efficiency and below average heating efficiency for a 3-ton central heat pump, but not rated for cold climates.

Ranks #169 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,073 a year to run in a mixed climate like Atlanta.

SEER2: 17.0 Cooling efficiency over a season
Average · beats 49%
HSPF2: 8.5 Heating efficiency over a season
Below average · beats 38%
EER2: 12.0 Cooling efficiency on a 95°F day
Average · beats 64%
Heat at 5°F: 19,800 BTU/h54% of its 47°F output
Excellent · beats 99%

A good fit if…

You want a choice of indoor units - 496 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.

Calculate my running cost

Details

Specifications3 ton, R-454B

General
Brand	York
Outdoor unit model	YH636E2S11
Series	LX SERIES
Type	Central heat pump
Nominal size	3 ton
CompressorVariable-speed units run longer at low power	Two-stage
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	April 1, 2025
Last certified	August 5, 2026
Cooling
SEER2Seasonal efficiency, higher is better	17.0 (range 15.2-17.0)
EER2Efficiency at 95°F outdoors	11.0-12.0
Cooling capacity	32,800-36,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.0-8.5
Capacity at 47°F	34,000-36,200 BTU/h
Capacity at 17°F	22,000-23,800 BTU/h
Capacity at 5°F	17,600-19,800 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.00-2.50
ENERGY STAR cold climate	No

Heating output as it gets colder54% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CTF48C5CFS1+JMET12CS2N1 at the standard test temperatures, in BTU/h:

Certified matchups496 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 496 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.
CTF48C5CFS1+JMET12CS2N1	-	17.0	12.0	8.5	19,300	217017113
CTU48C5XFS1+JMET12CS2N1+TXV	-	17.0	12.0	8.5	19,300	217017115
CTF48C5CFS1+JMC16C2SN1	-	17.0	12.0	8.5	19,300	217017117
CTU48C5XFS1+JMC16C2SN1+TXV	-	17.0	12.0	8.5	19,300	217017119
CTF48C5CFS1	Y82E080C16LMPS1	17.0	12.0	8.5	19,300	217017121
CTU48C5XFS1+TXV	Y82E080C16LMPS1	17.0	12.0	8.5	19,300	217017123
CTF48C5CFS1	Y81E120C16SMPS1	17.0	12.0	8.5	19,100	217017221
CTF48C5CFS1	Y81E120C16LMPS1	17.0	12.0	8.5	19,100	217017223
CTU48C5XFS1+TXV	Y81E120C16SMPS1	17.0	12.0	8.5	19,100	217017225
CTU48C5XFS1+TXV	Y81E120C16LMPS1	17.0	12.0	8.5	19,100	217017227
CTF48D5CFS1+JME18D2SN1	-	17.0	12.0	8.5	19,000	217017229
CTF48C5CFS1	Y82E100C16LMPS1	17.0	12.0	8.5	19,300	217017231
CTU48C5XFS1+TXV	Y82E100C16LMPS1	17.0	12.0	8.5	19,300	217017232
CTF48C5CFS1+JMC17C2SN1	-	17.0	12.0	8.5	19,100	217017255
CTU48C5XFS1+JMC17C2SN1+TXV	-	17.0	12.0	8.5	19,100	217017257
CTF48C5CFS1+JMVT16CC2N1	-	17.0	12.0	8.5	19,300	217017259
CTU48C5XFS1+JMVT16CC2N1+TXV	-	17.0	12.0	8.5	19,300	217017261
CTF48C5CFS1+JME12C2SN1	-	17.0	12.0	8.5	19,000	217017290
CTU48C5XFS1+JME12C2SN1+TXV	-	17.0	12.0	8.5	19,000	217017292
CTF48D5CFS1+JMC20D2SN1	-	17.0	12.0	8.5	19,100	217017155
CTF48D5CFS1+JMVT20DC2N1	-	17.0	12.0	8.5	19,100	217017157
CTF48C5CFS1	Y81E080C20SMPS1	17.0	12.0	8.5	19,300	217017159
CTF48C5CFS1	Y81E080C20LMPS1	17.0	12.0	8.5	19,300	217017161
CTU48C5XFS1+TXV	Y81E080C20SMPS1	17.0	12.0	8.5	19,300	217017163
CTU48C5XFS1+TXV	Y81E080C20LMPS1	17.0	12.0	8.5	19,300	217017165
CTU48C5XFS1+TXV	Y81E100C16SMPS1	17.0	12.0	8.5	19,500	217017195
CTF48C5CFS1+JMVT17CC2N1	-	17.0	12.0	8.5	19,100	217017187
CTU48C5XFS1+JMVT17CC2N1+TXV	-	17.0	12.0	8.5	19,100	217017189
CTF48C5CFS1	Y81E100C16SMPS1	17.0	12.0	8.5	19,500	217017190
CTF48C5CFS1	Y81E100C16LMPS1	17.0	12.0	8.5	19,500	217017192
CTU48C5XFS1+TXV	Y81E100C16LMPS1	17.0	12.0	8.5	19,500	217017196
CTF48D5CFS2+JMC20D2SN1	-	17.0	12.0	8.5	19,100	218507888
CTF48D5CFS2+JMVT20DC2N1	-	17.0	12.0	8.5	19,100	218507886
CTU48C5XFS2+TXV	Y81E100C16LMPS1	17.0	12.0	8.5	19,500	218507814
CTU48C5XFS2+TXV	Y81E100C16SMPS1	17.0	12.0	8.5	19,500	218507811
CTF48C5CFS2	Y81E100C16LMPS1	17.0	12.0	8.5	19,500	218507808
CTF48C5CFS2	Y81E100C16SMPS1	17.0	12.0	8.5	19,500	218507805
CTU48C5XFS2+TXV	Y82E100C16LMPS1	17.0	12.0	8.5	19,300	218507792
CTF48C5CFS2	Y82E100C16LMPS1	17.0	12.0	8.5	19,300	218507789
CTU48C5XFS2+TXV	Y81E080C20LMPS1	17.0	12.0	8.5	19,300	218507782
CTU48C5XFS2+TXV	Y81E080C20SMPS1	17.0	12.0	8.5	19,300	218507779
CTF48C5CFS2	Y81E080C20LMPS1	17.0	12.0	8.5	19,300	218507776
CTF48C5CFS2	Y81E080C20SMPS1	17.0	12.0	8.5	19,300	218507774
CTU48C5XFS2+TXV	Y82E080C16LMPS1	17.0	12.0	8.5	19,300	218507766
CTF48C5CFS2	Y82E080C16LMPS1	17.0	12.0	8.5	19,300	218507763
CTU48C5XFS2+JMVT16CC2N1+TXV	-	17.0	12.0	8.5	19,300	218507755
CTF48C5CFS2+JMVT16CC2N1	-	17.0	12.0	8.5	19,300	218507752
CTU48C5XFS2+JMC16C2SN1+TXV	-	17.0	12.0	8.5	19,300	218507749
CTF48C5CFS2+JMC16C2SN1	-	17.0	12.0	8.5	19,300	218507746
CTU48C5XFS2+TXV	Y81E120C16LMPS1	17.0	12.0	8.5	19,100	218507744
CTU48C5XFS2+TXV	Y81E120C16SMPS1	17.0	12.0	8.5	19,100	218507741
CTF48C5CFS2	Y81E120C16LMPS1	17.0	12.0	8.5	19,100	218507738
CTF48C5CFS2	Y81E120C16SMPS1	17.0	12.0	8.5	19,100	218507735
CTU48C5XFS2+JMVT17CC2N1+TXV	-	17.0	12.0	8.5	19,100	218507732
CTF48C5CFS2+JMVT17CC2N1	-	17.0	12.0	8.5	19,100	218507730
CTU48C5XFS2+JMC17C2SN1+TXV	-	17.0	12.0	8.5	19,100	218507727
CTF48C5CFS2+JMC17C2SN1	-	17.0	12.0	8.5	19,100	218507724
CTU48C5XFS2+JME12C2SN2+TXV	-	17.0	12.0	8.5	19,300	218636797
CTF48C5CFS2+JME12C2SN2	-	17.0	12.0	8.5	19,300	218636796
CTF48C5CFS1	Y82E120C20LMPS1	17.0	12.0	8.1	19,400	217017125

Yearly running cost in 10 large cities$946-$2,575

Phoenix, AZ$1,173/yr
Miami, FL$946/yr
Houston, TX$1,051/yr
Atlanta, GA$1,073/yr
Los Angeles, CA$1,046/yr
New York, NY$2,575/yr
Chicago, IL$2,093/yr
Denver, CO$1,742/yr
Seattle, WA$1,071/yr
Minneapolis, MN$2,156/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 YH636E2S11?: The York YH636E2S11 is rated at up to 17.0 SEER2 and 12.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 496 certified matchups SEER2 ranges from 15.2-17.0.
Is the York YH636E2S11 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 3-ton model.
How much does the York YH636E2S11 cost to run per year?: At its rated efficiency it costs about $946-$2,575 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,173 in Phoenix and $2,156 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 YH636E2S11?: ENERGY STAR lists 496 certified combinations for this outdoor unit. The highest-rated ones use CTF48C5CFS1+JMET12CS2N1, CTU48C5XFS1+JMET12CS2N1+TXV, CTF48C5CFS1+JMC16C2SN1.
What refrigerant does the York YH636E2S11 use?: It uses R-454B.

Running cost and savings

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

Heat pump $1,167/yrYou save $607/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 YH636E2S11

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: $1,167
Current system, per year: $1,773
You save per year: $607
Payback: 21.4 years
Net after 10 years: -$6,934

Cooling $708Heating $459Electricity used: 7,292 kWhSaved vs. a minimum-efficiency heat pump: $195

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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Coleman HC19B362117.0 SEER2 · 7.8 HSPF2
Heil N5H8T36*K*AAA17.0 SEER2 · 8.5 HSPF2
Luxaire HL19B362117.0 SEER2 · 7.8 HSPF2
Grandaire W5H8T36*K*AAA17.0 SEER2 · 8.5 HSPF2
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See all 302 3 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of August 5, 2026. How we use the data.