Sheet1Heat gain calculator, BTU / hourGain, in BTU/hr = (surface area / R) * temp diffCooling loads, interim case Infiltration = cu. Ft. * R * air changes/hr * temp. diffInside temp =72RoomElementft^2RA * UF diffGainNotesHouseFloor, w carpet010-190slab on insulIndependent Lighting Watts2,8009,548all powerof outside temp People41,364familyTotal insides0010,912Outside temp =105Floor2,0003067332,200DependentCeiling2,0003067684,533attic @ 140on outside tempN wall340191833591minus windsand insolationS wall340191833591minus windsW wall260191433452minus windsE wall260191433452minus windsWindows2402120333,960all 20Skylights3221633528all 4 Infiltration23,0000.0180.30334,099Total, outsides3,47226615,204Total, ins + outs3,47226626,116Insolation is not estimated and can be large so calcs are interim-case. Shading alsois not estimated and offsets insolation to some degree. 1 W = 3.41 BTU 1 person, seated, approx. = 100W = 341 BTU

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