A HVAC contractor would be the best person to ask this question to because they need to run something called a heat load calculation to determine the BTU number for your home.
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You need 100W per square meter. 100W equals around 341.3BTU. 1 square meter are around 10.7 square feet. You therefore need around 32 BTU per square foot.
1000
552 square feet (12 x 46 = 552).
You will need 3.5 square yards of material to cover 32 square feet.
how many boxes of wood flooring would i need if there are 19.72 sq feet in a box to cover 640 sq feet of an area?