Now that you know how to calculate hourly heat loss, how would you calculate daily heat loss?
Since there are 24 hours in a day, you would simply multiply the hourly heat loss by 24.
What is the hourly and daily heat loss of a 15-ft by 15-ft room with an 8-ft ceiling, with all surfaces insulated to R13, with inside temperature 65°F and outside temperature 25°F?
Once we know the heat loss rate per hour, we can determine the heat loss per day by multiplying by 24 (hours in a day).
In a 24-hour period or one day, the heat loss would be:
Area (ft2) is the sum of the area of all four walls. Each wall is 8' x 15', or 120 sq. feet, so take 4 x 120 sq ft to get 480 ft2 in the equation.