The correct way is to determine the coefficient of heat transmission for each of the areas of the room. Multiply this factor by the square footage and then multiply by the temperature difference at design temp. Then add all the values together. There are factors for each type of wall, floor, ceiling, type of window, etc. The coefficient of heat transmission, also called the "U value", is the inverse of the "R value". Example: A 20'X20' room with an 8' ceiling would work like this- 20X20= 400 sq. ft (floor and ceiling) total 800 sq.' 20X8=160X4 (walls)=640 sq.' R-19 insulation all around. 1/19= .053 U factor You want to maintain 70 degrees inside when it hits -10 outside (80 deg difference) Total area 640+800= 1440 sq. ft. 1440X.053X80=6105.6 BTU'S/ HOUR. Single pane windows are the worst for heat transmission. Low E are the best. U factors will vary slightly based on drywall, siding, etc. Air infiltration (leakage) also can really change the numbers too. Window manufacturers publish the U or R values for the windows and are easily obtained. Hope this helps.
Divide the heat loss or gain obtained by the load calculation by square footage of the building.
its usually about 20 btu's per square foot
about 12,000
This depends greatly on the region in which you live. In California 700 square feet would require only about 30,000 BTU. In Vermont, probably twice that much would be adequate. It also depends on insulation and weather sealing.
30000 btus for every 400 square ft
30000 btus for every 400 square ft
Will a 40,000 btu furnace be enough to heat my 1375 square foot middle unit town house.
what as the cost of heat for a 1200 square foot home in 2004
i had the same question
Usually the cost of radiant floor heat are about $5-$7 just for materials a square foot and a DIY approach. For a professional installation one has to count on $8 - $12 a square foot.
A commonly used formula is 600-650 square feet per ton. So it would be recommended to use a 2-ton heat pump for a 1300 square foot home. However, other variables are often considered, too, such as the age of the house.
4-5 tons