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Heating System Sizing WorksheetSimple Heating System Size: Washington State Project Information Contact Information Heating System Type: To see detailed instructions for each section, place your cursor on the word "Instructions" Design Temperature Instructions Design Temperature Difference (∆T)53 ∆T = Indoor (70 degrees) - Outdoor Design Temp Area of Building Conditioned Floor Area Instructions Conditioned Floor Area (sq ft)747 Average Ceiling Height Conditioned Volume Instructions Average Ceiling Height (ft)8.0 5,976 Glazing and Doors U-Factor X Area =UA Instructions 0.280 141 39.48 Skylights U-Factor X Area =UA Instructions 0.50 0 --- Insulation Attic U-Factor X Area =UA Instructions 0.026 383 9.96 Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA Instructions No selection --- Above Grade Walls (see Figure 1)U-Factor X Area UA Instructions 0.056 1,344 75.26 Floors U-Factor X Area UA Instructions 0.025 364 9.10 Below Grade Walls (see Figure 1)U-Factor X Area UA Instructions No selection --- Slab Below Grade (see Figure 1)F-Factor X Length UA Instructions No selection --- Slab on Grade (see Figure 1)F-Factor X Length UA Instructions No selection --- Location of Ducts Instructions Duct Leakage Coefficient 1.00 Sum of UA 133.80 Envelope Heat Load 7,092 Btu / Hour Sum of UA x ∆T Air Leakage Heat Load 3,421 Btu / Hour Volume x 0.6 x ∆T x 0.018 Building Design Heat Load 10,512 Btu / Hour Air leakage + envelope heat loss Building and Duct Heat Load 10,512 Btu / Hour Ducts in unconditioned space: sum of building heat loss x 1.10 Ducts in conditioned space: sum of building heat loss x 1 Maximum Heat Equipment Output 13,140 Btu / Hour Building and duct heat loss x 1.40 for forced air furnace Building and duct heat loss x 1.25 for heat pump This heating system sizing calculator is based on the Prescriptive Requirements of the 2018 Washington State Energy Code (WSEC) and ACCA Manuals J and S. This tool will calculate heating loads only. ACCA procedures for sizing cooling systems should be used to determine cooling loads. Please complete the green drop-downs and boxes that are applicable to your project. As you make selections in the drop-downs for each section, some values will be calculated for you. If you do not see the selection you need in the drop-down options, please contact the WSU Energy Program at energycode@energy.wsu.edu or (360) 956-2042 for assistance. 302 Van Trump Carey Miller 360.810.0560 Above Grade Below Grade Figure 1. All Other Systems Heat Pump (07/01/13)