Calculations of the number of British Thermal Units necessary to heat or cool each square foot of a room must also account for the climate zone and the room's insulation, sun exposure and primary function. Some calculations also account for the ceiling height. Divide the final BTU calculation by the total square footage to get the number of BTUs per square foot.
Know MoreFor square rooms, calculate the square footage by multiplying the room's width by its length. For irregular shapes, divide the room into a combination of squares and triangular shapes. Calculate the square footage of each shape and the add them together to determine the total for the room.
Check the climate zone maps provided by the U.S. Energy Information Administration to determine the necessary BTUs per square foot for your specific climate.
For heavily shaded rooms, reduce the amount of BTUs by 10 percent. Increase the amount by 10 percent for rooms with heavy sun exposure.
For rooms expected to regularly hold more than two people, increase the number of BTUs by 600 for each additional occupant.
For kitchens, add 4,000 BTUs to compensate for the energy from appliances.
Add BTUs for rooms with poor insulation, and subtract for rooms with good insulation.
To calculate cost per square foot, divide the purchase price of a house by its total square footage. For instance, if a house with 2,000 square feet sells for $180,000, the cost per square foot is $90 per square foot.
Full Answer >A square foot is a measure of surface area, and a mile is a measure of length. There are 5,280 feet in a mile and 27,878,400 square feet in a square mile.
Full Answer >A 2,600-square-foot home needs a four-ton or five-ton air conditioning unit, depending on the climate zone in which the home is located, according to AC 4 Life. Homes in the Southwest or South need five-ton air conditioners, while other zones can use four-ton units.
Full Answer >Masonry jobs typically require 6.3 standard bricks per square foot, but the likelihood that some break makes seven bricks per square foot a safer estimate. Plan to use seven bags of mortar for each 1,000 bricks.
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