If the room is heavily shaded, reduce capacity by 10 percent
If the room is very sunny, increase capacity by 10 percent
If more than two people regularly occupy the room, add 600 BTU for each additional person
If the unit is used in a kitchen, increase capacity by 4,000 BTU
What is a BTU?
BTU is short for British Thermal Unit, a unit of measurement that measures the amount of energy your air conditioner uses to remove heat from your home within one hour. For example, a 12,000 BTU Window Unit will remove more heat from a space within one hour than an 8,000 BTU Unit. An air conditioner with BTUs that exceed the recommended square footage in your home might experience more wear over time because it will be initiating its on/off cycle more frequently, as it requires less operating time to reach it’s set temperature.
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