Whenever possible, use your microwave instead of the oven. Microwaves use less than half the power of a conventional oven and cook food in about one-fourth the time. Ovens also heat up the kitchen, making your cooling system and refrigerator work harder.
Air conditioners are rated by the number of British Thermal Units (Btu) of heat they can remove per hour. Another common rating term for air conditioning size is the “ton,” which is 12,000 Btu per hour.