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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.
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How do you calculate btu per square foot?
Divide the heat loss or gain obtained by the load calculation by square footage of the building.
How many btus are needed to heat a sixty square foot room?
its usually about 20 btu's per square foot
How many BTUs to heat a 500 square foot house?
about 12,000
What size furnace do you need to heat 700 square foot area?
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.
How many btu's to heat 800 square foot home?
30000 btus for every 400 square ft
How many btu to heat a 800 square foot home?
30000 btus for every 400 square ft
How many square feet does a 40000 btu heater heat?
Will a 40,000 btu furnace be enough to heat my 1375 square foot middle unit town house.
Cost to heat hm of 1200 sq ft in 2004?
what as the cost of heat for a 1200 square foot home in 2004
What wattage space heater will heat a 280 square foot room?
i had the same question
About how much does radiant floor heat usually cost?
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.
What size heat pump do you need to heat a 1300 square foot home?
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.
What size heat pump system is needed for 2000 square foot home?
4-5 tons
