Divide the heat loss or gain obtained by the load calculation by square footage of the building.
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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.
Well, honey, to calculate Locked Rotor Amps (LRA) to British Thermal Units (BTU), you'll need to first convert LRA to watts by multiplying it by the voltage. Then, divide the result by 3.41 to get the BTU per hour. It's as simple as that, darling.
If something was $17.00 per square Yard it would be $1.89 per square Foot. (Just divide by 9)
This will depend where in the world you are. Expect to pay $1.50 to $2.50 per square foot for basic installation.
Standard brick are 4 inches by 2.23 inches by 8 inches, with only slight variations. There are 6.3 per square foot.