Calculate the heat loss due to conduction (only) for the room described below. Include ceiling, four windows, one door, two walls (exclude interior walls since delta T is zero). Assume the outdoor design temperature is -3 F and that the indoor temperature will be maintained at 68 F. Ceiling height is 9 feet. The ceiling/roofs are insulated at R-values of 42 hr ft F / BTU. (Assume insulation is at ceiling level.) Exterior walls are insulated at R-values of 21 hr ft F / BTU. There is no heat transfer across interior walls (because AT = 0). Windows have a U-value of 0.39 BTU/hr ft F. The insulated steel door has a U-value of 0.20 BTU/hr ft F. The air exchange rate of the building due to infiltration is 0.6, and there is no mechanical ventilation. 2'-8" x 6'-8" INSULATED STEEL DOOR 3-3'-0" x 4'-0" WINDOWS 2-6 x 4'-0" WINDOW FAMILY ROOM 9' HIGH CEILING INTERIOR WALL INTERIOR WALL 14'-0" 12'-0"