A rectangular room measures 13 feet by 15 feet. The room is well insulated and is on the south side of the house. It has an 8-foot-high ceiling. How large an air conditioner would this room require? Round to the nearest thousand BTUs.A rectangular room measures 13 feet by 15 feet. The room is well insulated and is on the south side of the house. It has an 8-foot-high ceiling. How large an air conditioner would this room require? Round to the nearest thousand BTUs.