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      1.5-ton central heat pump · 4CDH Series

      CanAir 4CDH2018C21

      Very good cooling and heating efficiency for a 1.5-ton central heat pump, and certified for cold climates.

      Ranks #32 of 170 1.5 ton central heat pumps for cooling efficiency, and costs about $510 a year to run in a mixed climate like Atlanta.

      SEER2
      19.0 Cooling efficiency over a season
      Very good · beats 85%
      HSPF2
      9.7 Heating efficiency over a season
      Very good · beats 77%
      EER2
      12.5 Cooling efficiency on a 95°F day
      Very good · beats 80%
      Heat at 5°F
      18,000 BTU/h95% of its 47°F output
      Average · beats 51%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 85% of central heat pumps.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 18,000 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 77% of central heat pumps.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • Nothing stands out - its ratings have no weak spot for its class.

      Calculate my running cost

      Details

      Specifications1.5 ton, R-454B
      General
      BrandCanAir
      Also sold asComfort-Aire, Custom Comfort, Kerr Kapstone
      Outdoor unit model4CDH2018C21
      Series4CDH Series
      TypeCentral heat pump
      Nominal size1.5 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceJuly 27, 2023
      Last certifiedMarch 13, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better19.0 (range 16.1-19.0)
      EER2Efficiency at 95°F outdoors11.7-12.5
      Cooling capacity18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.5-9.7
      Capacity at 47°F19,000 BTU/h
      Capacity at 17°F15,000-15,200 BTU/h
      Capacity at 5°F18,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00-2.06
      ENERGY STAR cold climateYes
      Heating output as it gets colder95% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 4CDH2018F21 at the standard test temperatures, in BTU/h:

      Certified matchups3 indoor units

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

      Indoor unitSEER2EER2HSPF2Heat @5°FAHRI ref.
      4CDH2018F21 · cold climate19.012.59.718,000215449704
      CEB-24MX1421 · cold climate16.111.79.518,000216621485
      CEB-24MX1721 · cold climate16.111.79.518,000216621486
      Same unit, other model numbers3

      These model numbers have exactly the same certified ratings and matchups as the CanAir 4CDH2018C21: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

      Yearly running cost in 10 large cities$446-$1,228

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

      Questions6
      What is the SEER2 rating of the CanAir 4CDH2018C21?
      The CanAir 4CDH2018C21 is rated at up to 19.0 SEER2 and 12.5 EER2 for cooling and up to 9.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 16.1-19.0.
      Is the CanAir 4CDH2018C21 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,000 BTU/h at 5°F with a COP of 2.06, so it is still 2.1 times as efficient as electric resistance heat at that temperature.
      How much does the CanAir 4CDH2018C21 cost to run per year?
      At its rated efficiency it costs about $446-$1,228 a year in electricity in large U.S. cities, depending on climate and local rates - for example $555 in Phoenix and $1,030 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the CanAir 4CDH2018C21 the same as the Comfort-Aire A-VXP18TA-1?
      Yes, as far as the certified ratings go. ENERGY STAR lists 4 model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
      Which indoor units work with the CanAir 4CDH2018C21?
      ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use 4CDH2018F21, CEB-24MX1421, CEB-24MX1721.
      What refrigerant does the CanAir 4CDH2018C21 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 $553/yrYou save $392/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 CanAir 4CDH2018C21
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $553
      Current system, per year
      $944
      You save per year
      $392
      Payback
      17.9 years
      Net after 10 years
      -$3,084

      Cooling $333Heating $219Electricity used: 3,455 kWhSaved vs. a minimum-efficiency heat pump: $174

      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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      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of March 13, 2025. How we use the data.