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      4-ton central heat pump · KEEN Series

      KEEN Home KEENSTDHP48AA

      Below average cooling and heating efficiency for a 4-ton central heat pump, and certified for cold climates.

      Ranks #233 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,524 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
      10.0 Cooling efficiency on a 95°F day
      Below average · beats 10%
      Heat at 5°F
      38,000 BTU/h79% of its 47°F output
      Below average · beats 12%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 38,000 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • 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
      BrandKEEN Home
      Outdoor unit modelKEENSTDHP48AA
      SeriesKEEN Series
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceJuly 4, 2025
      Last certifiedJuly 29, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better16.0 (range 16.0)
      EER2Efficiency at 95°F outdoors10.0
      Cooling capacity48,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.5
      Capacity at 47°F48,000 BTU/h
      Capacity at 17°F32,400 BTU/h
      Capacity at 5°F38,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.85
      ENERGY STAR cold climateYes
      Heating output as it gets colder79% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with KEENHYDAH48AA at the standard test temperatures, in BTU/h:

      Certified matchups1 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.
      KEENHYDAH48AA · cold climate16.010.08.538,000217596875
      Yearly running cost in 10 large cities$1,407-$3,606

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

      Questions5
      What is the SEER2 rating of the KEEN Home KEENSTDHP48AA?
      The KEEN Home KEENSTDHP48AA is rated at up to 16.0 SEER2 and 10.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the KEEN Home KEENSTDHP48AA good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 38,000 BTU/h at 5°F with a COP of 1.85, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
      How much does the KEEN Home KEENSTDHP48AA cost to run per year?
      At its rated efficiency it costs about $1,407-$3,606 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,713 in Phoenix and $2,996 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 KEEN Home KEENSTDHP48AA?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses KEENHYDAH48AA.
      What refrigerant does the KEEN Home KEENSTDHP48AA 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 $1,688/yrYou save $787/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 KEEN Home KEENSTDHP48AA
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,688
      Current system, per year
      $2,475
      You save per year
      $787
      Payback
      22.9 years
      Net after 10 years
      -$10,135

      Cooling $1,056Heating $632Electricity used: 10,553 kWhSaved vs. a minimum-efficiency heat pump: $210

      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 July 29, 2025. How we use the data.