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Contrary to popular belief, the required BTU output, or "tonnage", cannot be calculated based on square footage. Many factors go into determining the required BTU output to compensate for your home's heat loss/gain. A properly trained HVAC technician has the ability to calculate the required heat load for your home based on where you live, the materials your home is built with, the "r" value of your insulation, window type/size/quality/quantity, and even which direction each exterior wall faces. Many "old school" technicians say 500sqft per ton, but with today's strict building codes and better insulation, this rule of thumb no longer applies. In most cases, the old rule will cause you to oversize your system, resulting in big problems down the road, i.e., high humidity, mold, mildew, etc.

Q: What size heat pump is needed for a 1600 square foot duplex?

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1600 sq ft = 1600/9 sq yd = 177 7/9 sq yd. Almost 178 square yards are needed if all floors are to be carpeted. If it is a two floor house, additional carpeting may be needed for the stair risers, but usually the kitchen and bathroom(s) are not carpeted so their areas may be subtracted.

A foot is a unit of length. A square foot is a unit of area. The two units are therefore incompatible.

A=lw A=20*80 A=1600 feet2

1,600 square feet = 148.645 square meters (rounded to 3 decimal places)

144

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its usually about 20 btu's per square foot

The room is 144 square feet.

180

144

18..