HVAC Rated
    Menu

      3-ton central heat pump · NORTEK GLOBAL HVAC SH3BF SERIES

      NORTEK GLOBAL HVAC LLC SH3BF4M2SX36K

      Below average cooling and heating efficiency for a 3-ton central heat pump, but not rated for cold climates.

      Ranks #280 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,167 a year to run in a mixed climate like Atlanta.

      SEER2
      15.2 Cooling efficiency over a season
      Below average · beats 6%
      HSPF2
      8.1 Heating efficiency over a season
      Below average · beats 20%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Average · beats 43%
      Heat at 5°F
      - Not reported by the maker
      Below average · beats 1%

      A good fit if…

      • You want a certified 3-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.
      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications3 ton, R-410A
      General
      BrandNORTEK GLOBAL HVAC LLC
      Outdoor unit modelSH3BF4M2SX36K
      SeriesNORTEK GLOBAL HVAC SH3BF SERIES
      TypeCentral heat pump
      Nominal size3 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceOctober 25, 2022
      Last certifiedJanuary 31, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better15.2 (range 15.2)
      EER2Efficiency at 95°F outdoors11.7
      Cooling capacity34,200-36,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.1
      Capacity at 47°F34,000-34,600 BTU/h
      Capacity at 17°F22,000 BTU/h
      Capacity at 5°F-
      COP at 5°F2.0 = twice as efficient as a space heater1.75
      ENERGY STAR cold climateNo
      Heating output as it gets colder

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with B64VMMX48K-C at the standard test temperatures, in BTU/h:

      Certified matchups4 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.
      B64VMMX48K-C-15.211.78.1-210586537
      B64VMMX36K-B-15.211.77.8-210263453
      C74B(A,H)MX36C-BG7T(*)-V(*)B(*)15.211.77.8-210487917
      C74B(A,H)MX36C-CG7T(*)-V(*)C(*)15.211.77.8-210487918
      Yearly running cost in 10 large cities$1,098-$2,745

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

      Questions5
      What is the SEER2 rating of the NORTEK GLOBAL HVAC LLC SH3BF4M2SX36K?
      The NORTEK GLOBAL HVAC LLC SH3BF4M2SX36K is rated at up to 15.2 SEER2 and 11.7 EER2 for cooling and up to 8.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the NORTEK GLOBAL HVAC LLC SH3BF4M2SX36K 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 3-ton model.
      How much does the NORTEK GLOBAL HVAC LLC SH3BF4M2SX36K cost to run per year?
      At its rated efficiency it costs about $1,098-$2,745 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,327 in Phoenix and $2,273 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 NORTEK GLOBAL HVAC LLC SH3BF4M2SX36K?
      ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated ones use B64VMMX48K-C, B64VMMX36K-B, C74B(A,H)MX36C-B.
      What refrigerant does the NORTEK GLOBAL HVAC LLC SH3BF4M2SX36K 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 $1,303/yrYou save $516/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 NORTEK GLOBAL HVAC LLC SH3BF4M2SX36K
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,303
      Current system, per year
      $1,819
      You save per year
      $516
      Payback
      26.1 years
      Net after 10 years
      -$8,336

      Cooling $824Heating $478Electricity used: 8,143 kWhSaved vs. a minimum-efficiency heat pump: $90

      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 3 ton models

      See all 302 3 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of January 31, 2025. How we use the data.