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      3-ton central heat pump · G Series

      TOSOT TU36W-GDU

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

      Ranks #65 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,030 a year to run in a mixed climate like Atlanta.

      SEER2
      19.0 Cooling efficiency over a season
      Very good · beats 85%
      HSPF2
      8.3 Heating efficiency over a season
      Below average · beats 30%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Average · beats 43%
      Heat at 5°F
      21,600 BTU/h64% of its 47°F output
      Below average · beats 39%

      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.

      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.

      Calculate my running cost

      Details

      Specifications3 ton, R-32
      General
      BrandTOSOT
      Outdoor unit modelTU36W-GDU
      SeriesG Series
      TypeCentral heat pump
      Nominal size3 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-32
      Connected (smart) capableNo
      On the market sinceDecember 18, 2024
      Last certifiedJuly 16, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better19.0 (range 19.0)
      EER2Efficiency at 95°F outdoors11.7
      Cooling capacity34,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.3
      Capacity at 47°F34,000 BTU/h
      Capacity at 17°F27,400 BTU/h
      Capacity at 5°F21,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00
      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 TUD36AH2-GDU 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.
      TUD36AH2-GDU19.011.78.321,600216626002
      Same unit, other model numbers3

      These model numbers have exactly the same certified ratings and matchups as the TOSOT TU36W-GDU: 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$845-$2,522

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

      Questions6
      What is the SEER2 rating of the TOSOT TU36W-GDU?
      The TOSOT TU36W-GDU is rated at up to 19.0 SEER2 and 11.7 EER2 for cooling and up to 8.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the TOSOT TU36W-GDU 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 TOSOT TU36W-GDU cost to run per year?
      At its rated efficiency it costs about $845-$2,522 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,078 in Phoenix and $2,136 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the TOSOT TU36W-GDU the same as the TOSOT TU36-32GDU?
      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 TOSOT TU36W-GDU?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses TUD36AH2-GDU.
      What refrigerant does the TOSOT TU36W-GDU use?
      It uses 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 $1,089/yrYou save $664/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 TOSOT TU36W-GDU
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,089
      Current system, per year
      $1,753
      You save per year
      $664
      Payback
      19.6 years
      Net after 10 years
      -$6,356

      Cooling $630Heating $459Electricity used: 6,804 kWhSaved vs. a minimum-efficiency heat pump: $256

      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 July 16, 2026. How we use the data.