[PDF] air conditioning calculations rule of thumb

A good rule of thumb to follow is that you'll need approximately 20 BTU for every square foot of floor area. However, there are also other considerations to take into account before calculating the capacity, including the height of your ceiling as well as how many windows and doors are in a specific room.
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  • What is the thumb rule for AC capacity?

    Many contractors use rules of thumb to decide what size cooling equipment to install. Usually, the rule is based on the amount of conditioned floor area, and contractors in many areas generally use the rule of 1 ton of air conditioning capacity for each 400 to 600 square feet of floor area.

  • How do you calculate how much air conditioner you need?

    FAQ About Air Conditioner Sizing

    1To calculate what size air conditioner you need, calculate the square footage of your home and multiply it by 20 to get the BTUs needed. 2A 12,000 BTU unit will cool a 400 to 600-square-foot space.3An air conditioner size of two tons will cool a space of 1,500 square feet.

  • How do you calculate AC tonnage thumb rule?

    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.
  • One cfm is needed per square foot (1 cfm/sq ft) of floor area. This is the average air quantity required for a room or an entire building. This number is based upon an averaged heat load calculation for comfort cooling.
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