3. a) Find the total heat loss through the exterior wall and windows of a room at 72F Wall: 8 in. concrete, R-5 insulation, 0.5 in gypsum wall board, 30 ft long by 15 ft high. Windows: (5) 4 ft wide by 4 ft high double glass, aluminum frame, casement type, and infiltration rate 0.5 CPM/ft. Location: Salt Lake City, Utah b) If an additional R-10 insulation are added, what is the heat loss now?