Q) What size (BTU) air conditioner do I need for my rooms?
The general rule of thumb for sizing an air conditioner for a room is to use 30 BTU per square foot. Generally speaking, a 300 sq.ft. room requires a 9,000 BTU unit; a 400 sq.ft. requires a 12,000 BTU unit and a 500 sq.ft room requires a 15,000 BTU unit. However, consideration must be made to compensate for high humidity areas and special situations such as an interior or exterior corridor.