#AC BTU CALCULATOR HOW TO#
#AC BTU CALCULATOR MANUAL#
#AC BTU CALCULATOR WINDOWS#

#AC BTU CALCULATOR MANUAL#

Contractors use sophisticated software in addition to manual calculations to determine the AC that’s the best size, provides the most comfort, and is most efficient. You’ll need to multiply the height of the ceiling by room square footage, add 100 BTU per occupant, and 1,000 BTU each per exterior door and window. can vary, so it’s more important to look at the overall AC size requirements for your home. There are many factors in determining HVAC load. Climate zone BTU calculations differ slightly from the DOE’s. These zones are ranked from Zone 1 to Zone 5, generally going from south to north. Then add up the size of every room to get the total square footage of your home. Odd-shaped rooms can be measured by breaking them down into regular shapes and measuring them separately. The square footage of a triangular room is determined by multiplying the length by width and dividing by 2, while for circular rooms, measure the radius, then multiply 3.14 by the radius squared. The size of rectangular rooms is determined by measuring the length and width in feet and multiplying both numbers. your AC needs to be: Measure Your Entire Home’s Square Footage The calculator uses other variables as well. The general formula includes the room size in square feet, ceiling height (typically 8 or 9 feet for a home), and the type of room and how many people regularly occupy it. Using a BTU calculator, you can quickly determine the AC capacity your home needs.

#AC BTU CALCULATOR WINDOWS#

if you have high walls, live in a hot climate like Florida or Arizona, a particular room usually faces the sun, and it has more/larger windows than average. Therefore, a simple formula for calculating BTUs is to multiply the total square footage of your home by 20. The DOE generally recommends 20 BTUs per square foot of living space. Department of Energy (DOE) Recommendations In general, 12,000 BTUs of heat can be extracted from anywhere from 400 to 600 square feet of space in that time, depending on climate, shading, ceiling height, window size, etc. For example, a one-ton air conditioner can remove 12,000 BTUs of heat per hour. British Thermal Units per hour is a measurement, expressed in tons, of the unit’s cooling ability over one hour. A Look at AC RatingsĮvery air conditioner has a BTUh rating. However, there are other factors in determining the number of BTUs per sq.

The capacity needed for your home mainly depends on its square footage. It is measured in British Thermal Units (BTUs) a BTU is a unit of heat needed to raise a pound of water by 1℉.

But we know sizing is more complex than that.Ĭooling capacity is a determining factor in sizing an air conditioner.

Too big an AC will use too much energy and too small a unit won’t cool your space properly.

#AC BTU CALCULATOR HOW TO#

We’ve discussed how to choose an AC that’s the right size for your home.

Ac btu calculator