Heating Calculations R Value Wall R Value -Please SelectTentBrick- UninsulatedBrick- Light InsulatedBrick- Well InsulatedWood- UninsulatedWood-Light InsulatedWood-Well InsulatedMetal- UninsulatedMetal-Light InsulatedMetal- Well InsulatedManual Ceiling R Value -Please SelectTentBrick- UninsulatedBrick- Light InsulatedBrick- Well InsulatedWood- UninsulatedWood-Light InsulatedWood-Well InsulatedMetal- UninsulatedMetal-Light InsulatedMetal- Well InsulatedManual Floor R Value -Please SelectRockSoilConcrete Structure Length (ft) Structure Width (ft) Wall Height (ft) Peak Height (ft) Ambient Temperature (F) Ground Temperature (F) Desired Internal Temperature (F) Number of People Wattage of Lighting (W) Wall Calculations Required BTU's Ceiling Calculations Required BTU's Floor Load Required BTU's Additional Load Calculations Required BTU's Total BTU's Required kW of Heat This formula assumes return air. If return air is not used kW required must be doubled.