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      2-ton central heat pump · HRG18 SERIES

      Century HRG1836S1P

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

      Ranks #62 of 331 2 ton central heat pumps for cooling efficiency, and costs about $704 a year to run in a mixed climate like Atlanta.

      SEER2
      19.0 Cooling efficiency over a season
      Very good · beats 85%
      HSPF2
      8.5 Heating efficiency over a season
      Below average · beats 38%
      EER2
      12.3 Cooling efficiency on a 95°F day
      Very good · beats 76%
      Heat at 5°F
      18,200 BTU/h64% of its 47°F output
      Very good · beats 71%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 85% of central heat pumps.
      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 94 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
      BrandCentury
      Also sold asComfort-Aire
      Outdoor unit modelHRG1836S1P
      SeriesHRG18 SERIES
      TypeCentral heat pump
      Nominal size2 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceJuly 1, 2021
      Last certifiedJune 23, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better19.0 (range 17.1-19.0)
      EER2Efficiency at 95°F outdoors11.7-12.3
      Cooling capacity23,000-34,600 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.5
      Capacity at 47°F23,000-34,600 BTU/h
      Capacity at 17°F15,000-22,400 BTU/h
      Capacity at 5°F14,300-18,200 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.85-2.18
      ENERGY STAR cold climateNo
      Heating output as it gets colder64% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with EAH1P30B+H4TXV01 at the standard test temperatures, in BTU/h:

      Certified matchups94 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 94 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      EAH1P30B+H4TXV01GUH96T045B3M19.012.38.515,000207071363
      EAH1P30B+H4TXV01GUH96T045B3M19.012.38.515,000207071364
      EAH1P30B+H4TXV01GUH96T070B3M19.012.38.514,900207071365
      EAH1P30B+H4TXV01GUH96T070B3M19.012.38.514,900207071366
      EAH1P30B+H4TXV01GUH92C045B3M19.012.38.515,200207071369
      EAH1P30B+H4TXV01GUH92C045B3M19.012.38.515,200207071370
      EAH1P30B+H4TXV01GUH92C070B3M19.012.38.515,100207071371
      EAH1P30B+H4TXV01GUH92C070B3M19.012.38.515,100207071372
      HCG36V1P-19.011.78.518,100207071025
      HCG36V1P-19.011.78.518,100207071026
      EAC4X30BGUH96T070B3M19.012.38.114,800207071345
      EAC4X30BGUH96T070B3M19.012.38.114,800207071346
      E*1P23B+H4TXV01GUH96T045B3M19.012.38.114,300207071264
      E*1P23B+H4TXV01GUH96T045B3M19.012.38.114,300207071263
      E*1P23B+H4TXV01GUH96T070B3M19.012.38.114,300207071265
      E*1P23B+H4TXV01GUH96T070B3M19.012.38.114,300207071266
      E*1P23B+H4TXV01GUH92C070B3M19.012.38.114,500207071271
      E*1P23B+H4TXV01GUH92C070B3M19.012.38.114,500207071272
      EA(C,U)1P30B+H4TXV01GUH96T070B3M19.012.38.114,800207071305
      EA(C,U)1P30B+H4TXV01GUH96T070B3M19.012.38.114,800207071306
      EAC4X24BGUH92C070B3M19.012.37.815,500207071331
      EAC4X24BGUH92C070B3M19.012.37.815,500207071332
      EA(C,U)1P24B+H4TXV01GUH96T045B3M19.012.37.815,300207071283
      EA(C,U)1P24B+H4TXV01GUH96T045B3M19.012.37.815,300207071284
      EA(C,U)1P24B+H4TXV01GUH96T070B3M19.012.37.815,200207071285
      EA(C,U)1P24B+H4TXV01GUH96T070B3M19.012.37.815,200207071286
      EA(C,U)1P24B+H4TXV01GUH92C070B3M19.012.37.815,500207071291
      EA(C,U)1P24B+H4TXV01GUH92C070B3M19.012.37.815,500207071292
      EAC4X24BGUH96T045B3M19.012.37.815,300207071323
      EAC4X24BGUH96T045B3M19.012.37.815,300207071324
      EAC4X24BGUH96T070B3M19.012.37.815,200207071325
      EAC4X24BGUH96T070B3M19.012.37.815,200207071326
      EAH1P30B+H4TXV01GUH96C045B3M18.512.38.515,300207071377
      EAH1P30B+H4TXV01GUH96C045B3M18.512.38.515,300207071378
      HCG24V1P-18.512.38.515,400207071258
      HCG30V1P-18.512.38.515,200207071260
      HCG24V1P-18.512.38.515,400207071257
      HCG30V1P-18.512.38.515,200207071259
      EAC4X30BGUH96T045B3M18.512.38.114,900207071343
      EAC4X30BGUH96T045B3M18.512.38.114,900207071344
      EAC4X30BGUH92C045B3M18.512.38.115,100207071349
      EAC4X30BGUH92C045B3M18.512.38.115,100207071350
      EAC4X30BGUH92C070B3M18.512.38.115,000207071351
      EAC4X30BGUH92C070B3M18.512.38.115,000207071352
      E*1P23B+H4TXV01GUH92C045B3M18.512.38.114,600207071270
      E*1P23B+H4TXV01GUH92C045B3M18.512.38.114,600207071269
      EA(C,U)1P30B+H4TXV01GUH96T045B3M18.512.38.114,900207071303
      EA(C,U)1P30B+H4TXV01GUH96T045B3M18.512.38.114,900207071304
      EA(C,U)1P30B+H4TXV01GUH92C045B3M18.512.38.115,100207071309
      EA(C,U)1P30B+H4TXV01GUH92C045B3M18.512.38.115,100207071310
      EA(C,U)1P30B+H4TXV01GUH92C070B3M18.512.38.115,000207071311
      EA(C,U)1P30B+H4TXV01GUH92C070B3M18.512.38.115,000207071312
      EAC4X24BGUH92C045B3M18.512.37.815,500207071329
      EAC4X24BGUH92C045B3M18.512.37.815,500207071330
      EA(C,U)1P24B+H4TXV01GUH92C045B3M18.512.37.815,500207071289
      EA(C,U)1P24B+H4TXV01GUH92C045B3M18.512.37.815,500207071290
      EAH1P30B+H4TXV01GUH96C070B3M18.012.38.515,300207071380
      EAH1P30B+H4TXV01GUH96C070B3M18.012.38.515,300207071379
      EAC4X30BGUH95C045B3M18.012.38.115,100207071353
      EAC4X30BGUH95C045B3M18.012.38.115,100207071354
      Yearly running cost in 10 large cities$586-$1,717

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

      Questions5
      What is the SEER2 rating of the Century HRG1836S1P?
      The Century HRG1836S1P is rated at up to 19.0 SEER2 and 12.3 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 94 certified matchups SEER2 ranges from 17.1-19.0.
      Is the Century HRG1836S1P 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 Century HRG1836S1P cost to run per year?
      At its rated efficiency it costs about $586-$1,717 a year in electricity in large U.S. cities, depending on climate and local rates - for example $743 in Phoenix and $1,450 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 Century HRG1836S1P?
      ENERGY STAR lists 94 certified combinations for this outdoor unit. The highest-rated ones use EAH1P30B+H4TXV01, HCG36V1P, EAC4X30B.
      What refrigerant does the Century HRG1836S1P 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 $748/yrYou save $469/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 Century HRG1836S1P
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $748
      Current system, per year
      $1,217
      You save per year
      $469
      Payback
      19.2 years
      Net after 10 years
      -$4,313

      Cooling $437Heating $311Electricity used: 4,676 kWhSaved vs. a minimum-efficiency heat pump: $185

      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 2 ton models

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      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 23, 2026. How we use the data.