[PDF] air conditioner capacity calculation formula

To estimate your AC tonnage needs, multiply the number of square feet you're cooling times 25. This equals the total number of BTUs you need to adequately cool your space. Next, divide that number by 12,000 to determine the tonnage capability you need in your new air conditioning unit.
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  • What size room is needed for 1.5 ton AC?

    Room size and power consumption
    For instance, a 1-ton window AC or a 1.5 ton split AC is an ideal choice for rooms measuring up to 150-160 sq ft.
  • BTU Output = Temperature Rise (? T) x CFM x 1.08
    It is critical to understand that the 1.08 multiplier is not simply a constant that we can use with every calculation; it has just become convenient to assume such over time. This number includes the specific heat (Cp) of air (0.24 BTU per pound per degree Fahrenheit).
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