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How Much Space Can a 12,000 BTU Air Conditioner Cool? A Quick Overview A 12,000 BTU air conditioner delivers about one ton of cooling capacity, roughly 3.5 kW. BTU per hour measures how much heat the unit can remove. We think of it like buckets of heat carried out of a room each hour. At 12,000 buckets, you are in the mid-size residential class, a common choice for a single large room or a compact ...