What Size AC Do I Need? Room Size Vs. Ac Tonnage Guide

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       Buying an air conditioner that's the wrong size is one of the most expensive mistakes homeowners make, and most people don't even realize it's happening. An AC that's too small struggles nonstop and never quite cools the room. An AC that's too large cools too fast, shuts off before removing humidity, and leaves the space feeling clammy. At Cooling Expertise, we walk you through exactly how AC tonnage works and how to match it to your room size, so you get the comfort and efficiency you're paying for. What Does "Tonnage" Mean in an AC? Despite the name, tonnage has nothing to do with weight. It refers to the cooling capacity of an air conditioner, measured in tons of refrigeration. One ton of cooling capacity equals 12,000 British Thermal Units (BTUs) per hour. So a 1.5-ton AC provides 18,000 BTUs per hour, and a 2-ton AC provides 24,000 BTUs per hour. This BTU rating tells you how much heat the unit can remove from a space in an hour. The la...

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 Last updated: September 21, 2026

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