Room Length (ft)
Please enter a positive number.
Room Width (ft)
Please enter a positive number.
Ceiling Height (ft)
Please enter a positive number.
Desired Temp Rise (°F)
Please enter a positive number.
Insulation Factor
Poor (uninsulated)
Average (R-11 walls, R-19 ceiling)
Good (R-19 walls, R-30 ceiling)
Excellent (R-30+ walls, R-49 ceiling)
Window Area (sq ft)
Please enter a non-negative number.
Calculate
Required Heater
Calculation Details