The central air conditioners that are installed in your home range from 1.5-ton to 5-ton units and increase in half-ton increments (2-ton, 2.5-ton, 3-ton, etc…). Anything over 5-tons is generally considered a light commercial HVAC unit (not available for residential projects)
What Size Air Conditioner Do I Need? Using an air conditioner on a hot day can make the temperatures more bearable, but only if the air conditioner is big enough to cool the area you want it to.
Air conditioner sizes are rated in tons of cooling capacity. One ton of cooling is equal to 12,000 BTU’s (British thermal units) per hour. For example, a typical residential unit is a 2-ton unit that cools 24000 BTU/hour and a larger 3-ton unit cools 36000 BTU/hour. While two air conditioners be
Let’s say the room is 12 feet wide by 15 feet long. That means 12×15=180 square feet. Take the 180 sq. ft. times 25 BTU per square foot and you get the minimum BTU air conditioner you should buy. That means 180×25=4500 BTU cooling capacity is needed.
An air conditioner’s cooling capacity is expressed in BTUh (British Thermal Units per Hour) or tons (often referred to as “tonnage”). Both offer a measurement of an air conditioner’s cooling ability over an hour’s time. One ton of cooling capacity is equal to 12,000 BTUh.
As a rule of thumb, an air conditioner needs 20 Btu for each square foot of living space. But don’t buy by Btu alone. Other considerations, such as the ceiling height and the size of your windows and doorways, might call for for more cooling power. To measure your …