A 100 ampere service is the minimum standard today for structures that do not have electric heat or central air conditioning.
Room and window air conditioners cool only the rooms rather than the entire home or business. Because they cool a smaller space, room air conditioners are less expensive to operate as compared to the central units, even though their efficiency is generally lower than them.
The required cooling capacity for any room air conditioner depends on the size of the room which is being cooled that means room air conditioners usually have cooling capacities that range from 5,500 Btu per hour to 14,000 Btu per hour.
A common rating term which is used for air conditioning size is the "ton," which is 12,000 Btu per hour.
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