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      2-ton central heat pump · NORTEK GLOBAL HVAC SH4BF SERIES

      NORDYNE SH4BF5M2SX24K

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

      Ranks #305 of 331 2 ton central heat pumps for cooling efficiency, and costs about $766 a year to run in a mixed climate like Atlanta.

      SEER2
      16.0 Cooling efficiency over a season
      Below average · beats 26%
      HSPF2
      8.0 Heating efficiency over a season
      Below average · beats 12%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Average · beats 43%
      Heat at 5°F
      11,000 BTU/h48% of its 47°F output
      Below average · beats 1%

      A good fit if…

      • You want a certified 2-ton central heat pump at a typical efficiency level.

      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

      Specifications2 ton, R-454B
      General
      BrandNORDYNE
      Also sold asNORTEK GLOBAL HVAC LLC
      Outdoor unit modelSH4BF5M2SX24K
      SeriesNORTEK GLOBAL HVAC SH4BF SERIES
      TypeCentral heat pump
      Nominal size2 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceDecember 19, 2024
      Last certifiedMay 15, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better16.0 (range 16.0)
      EER2Efficiency at 95°F outdoors11.7
      Cooling capacity23,000-24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.0
      Capacity at 47°F22,800 BTU/h
      Capacity at 17°F14,000-14,600 BTU/h
      Capacity at 5°F11,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.75
      ENERGY STAR cold climateNo
      Heating output as it gets colder48% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with B65VMMX24K-B at the standard test temperatures, in BTU/h:

      Certified matchups5 indoor units

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

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      B65VMMX24K-B-16.011.78.011,000216508803
      B65VMMX24K-B-16.011.78.011,000216802049
      B65VMMX24K*B-16.011.78.011,000217196759
      C75B(A,H)MX36C-BG7T(*)-V(*)B(*)16.011.77.811,000216802054
      C75B(A,H)MX36C*BG7T(*)-V(*)B(*)16.011.77.811,000217196761
      Yearly running cost in 10 large cities$704-$1,816

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

      Questions5
      What is the SEER2 rating of the NORDYNE SH4BF5M2SX24K?
      The NORDYNE SH4BF5M2SX24K is rated at up to 16.0 SEER2 and 11.7 EER2 for cooling and up to 8.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the NORDYNE SH4BF5M2SX24K 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 NORDYNE SH4BF5M2SX24K cost to run per year?
      At its rated efficiency it costs about $704-$1,816 a year in electricity in large U.S. cities, depending on climate and local rates - for example $859 in Phoenix and $1,511 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 NORDYNE SH4BF5M2SX24K?
      ENERGY STAR lists 5 certified combinations for this outdoor unit. The highest-rated ones use B65VMMX24K-B, B65VMMX24K*B, C75B(A,H)MX36C-B.
      What refrigerant does the NORDYNE SH4BF5M2SX24K 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 $847/yrYou save $371/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 NORDYNE SH4BF5M2SX24K
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $847
      Current system, per year
      $1,218
      You save per year
      $371
      Payback
      24.3 years
      Net after 10 years
      -$5,293

      Cooling $528Heating $319Electricity used: 5,295 kWhSaved vs. a minimum-efficiency heat pump: $84

      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

      See all 331 2 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 15, 2025. How we use the data.