HVAC Rated
    Menu

      4-ton central heat pump · LX SERIES

      York YH660E2S11

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

      Ranks #234 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,767 a year to run in a mixed climate like Atlanta.

      SEER2
      16.0 Cooling efficiency over a season
      Below average · beats 26%
      HSPF2
      8.5 Heating efficiency over a season
      Below average · beats 38%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Average · beats 43%
      Heat at 5°F
      32,600 BTU/h54% of its 47°F output
      Excellent · beats 94%

      A good fit if…

      • You want a choice of indoor units - 235 certified pairings.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.
      • Cooling cost matters most - its SEER2 is below average for central heat pumps.
      • You mainly need heat - its HSPF2 is below average for central heat pumps.

      Calculate my running cost

      Details

      Specifications4 ton, R-454B
      General
      BrandYork
      Outdoor unit modelYH660E2S11
      SeriesLX SERIES
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceApril 1, 2025
      Last certifiedSeptember 22, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.0 (range 15.2-16.0)
      EER2Efficiency at 95°F outdoors11.0-12.0
      Cooling capacity52,500-55,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.5
      Capacity at 47°F56,000-60,000 BTU/h
      Capacity at 17°F37,800-39,500 BTU/h
      Capacity at 5°F30,000-32,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00-2.38
      ENERGY STAR cold climateNo
      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 CTM60D5CJS1+JMVT20DC2N1 at the standard test temperatures, in BTU/h:

      Certified matchups235 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 235 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      CTM60D5CJS1+JMVT20DC2N1-16.011.78.532,000217018151
      CTM60D5CJS1+JMC20D2SN1-16.011.78.532,000217018266
      CTM60D5CJS1+JME18D2SN1-16.011.78.532,000217018346
      CTF60D5CJS1Y81E130D20SMPS116.011.78.532,200217017690
      CTF60D5CJS1Y81E130D20LMPS116.011.78.532,200217017692
      CTF60D5CJS1+JMET18DS2N1-16.011.78.532,000217017708
      CTF60D5CJS1+JMVT20DC2N1-16.011.78.532,000217017724
      CTF60D5CJS1+JMC20D2SN1-16.011.78.532,000217017733
      CTF60D5CJS1+JME18D2SN1-16.011.78.532,000217017752
      JHE60D5CJ2SS1-16.011.78.532,000217021935
      JSE60D5CJ2SS1-16.011.78.532,000217021897
      JHE60D5CJ2SS2-16.011.78.532,000218456722
      CTM60D5CJS2+JMVT20DC2N1-16.011.78.532,000218508524
      CTM60D5CJS2+JMC20D2SN1-16.011.78.532,000218508522
      CTF60D5CJS2Y81E130D20LMPS116.011.78.532,200218508377
      CTF60D5CJS2Y81E130D20SMPS116.011.78.532,200218508375
      CTF60D5CJS2+JMC20D2SN1-16.011.78.532,000218508372
      CTF60D5CJS2+JMVT20DC2N1-16.011.78.532,000218508370
      CTF60D5CJS2+JME18D2SN2-16.011.78.532,000218636833
      CTM60D5CJS1Y81E130D20SMPS116.011.08.132,400217018192
      CTM60D5CJS1Y81E130D20LMPS116.011.08.132,400217018194
      CTM60D5CHS1+JME18D2SN1-16.011.78.131,600217018259
      JHC60D5CH2SS1-16.012.08.131,400217018348
      JHC60C5CH2SS1-16.012.08.131,400217018352
      JHE60C5CH2SS1-16.012.08.131,400217018354
      JHC60D5CJ2SS1-16.011.08.132,400217021920
      JHE60C5CH2SS2-16.012.08.131,400218456721
      CTM60D5CJS2Y81E130D20LMPS116.011.08.132,400218508530
      CTM60D5CJS2Y81E130D20SMPS116.011.08.132,400218508527
      JHE60D5CH2SS1-16.011.78.030,000217016560
      JHE60D5CH2SS2-16.011.78.030,000218456723
      CTM60D5CJS1Y91E120D20SMPS115.211.08.532,600217018228
      CTM60D5CJS1+JMET18DS2N1-15.211.78.532,000217018226
      CTM60D5CJS2Y91E120D20SMPS115.211.08.532,600218508536
      CTM60D5CJS2+JME18D2SN2-15.211.78.532,000218636818
      CTF60C5CHS1Y82V100C16SMPC115.211.08.131,800217445116
      CTM60C5CHS1Y82V080C16SMPC115.211.78.131,600217445115
      CTF60C5CHS1Y82V120C20SMPC115.211.78.131,800217445117
      CTF60C5CHS1Y82V100C20SMPC115.211.78.131,600217445118
      CTM60C5CHS1Y82V120C20SMPC115.211.08.132,400217445119
      CTM60C5CHS1Y82V100C20SMPC115.211.78.131,600217445120
      CTM60C5CHS1Y82V100C16SMPC115.211.78.131,400217445122
      CTF60C5CHS1Y82V080C16SMPC115.211.78.131,600217445121
      CTM60D5CHS1Y81E130D20LMPS115.212.08.131,400217018344
      CTM60D5CHS1Y81E130D20SMPS115.212.08.131,400217018342
      CTM60C5CHS1Y91E100C20SMPS115.211.08.132,000217018340
      CTM60D5CHS1+JMET18DS2N1-15.212.08.131,200217018337
      CTM60C5CHS1+JMC16C2SN1-15.212.08.131,200217018335
      CTM60C5CHS1Y81E100C16LMPS115.211.78.131,600217018333
      CTM60C5CHS1Y81E100C16SMPS115.211.78.131,600217018331
      CTM60D5CJS1Y92E120D20SMPS115.211.08.132,400217018300
      CTM60C5CHS1Y92E100C16SMPS115.211.08.131,800217018296
      CTM60D5CHS1+JMC20D2SN1-15.212.08.131,200217018292
      CTM60C5CHS1Y81E120C20LMPS115.211.78.131,600217018290
      CTM60C5CHS1Y81E120C20SMPS115.211.78.131,600217018288
      CTM60D5CHS1Y91E120D20SMPS115.211.78.131,600217018263
      CTM60C5CHS1Y92E080C16SMPS115.211.08.131,800217018261
      CTM60C5CHS1+JMVT17CC2N1-15.212.08.131,000217018257
      CTM60C5CHS1Y91E100C16SMPS115.211.08.131,600217018255
      CTM60D5CHS1Y92E120D20SMPS115.211.78.131,600217018224
      Yearly running cost in 10 large cities$1,572-$4,229

      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 YH660E2S11?
      The York YH660E2S11 is rated at up to 16.0 SEER2 and 11.7 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 235 certified matchups SEER2 ranges from 15.2-16.0.
      Is the York YH660E2S11 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 YH660E2S11 cost to run per year?
      At its rated efficiency it costs about $1,572-$4,229 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,941 in Phoenix and $3,536 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 YH660E2S11?
      ENERGY STAR lists 235 certified combinations for this outdoor unit. The highest-rated ones use CTM60D5CJS1+JMVT20DC2N1, CTM60D5CJS1+JMC20D2SN1, CTM60D5CJS1+JME18D2SN1.
      What refrigerant does the York YH660E2S11 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 $1,928/yrYou save $888/yrSee details ↓
      1. Where you live
      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.

      2. The heat pump York YH660E2S11
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,928
      Current system, per year
      $2,816
      You save per year
      $888
      Payback
      22.5 years
      Net after 10 years
      -$11,122

      Cooling $1,177Heating $751Electricity used: 12,050 kWhSaved vs. a minimum-efficiency heat pump: $240

      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.

      Similar 4 ton models

      See all 319 4 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 22, 2026. How we use the data.