How do you calculate BTU required for the room?

To calculate the BTU (British Thermal Units) required for a room, first determine the room's square footage by multiplying its length by width. Then, use the general guideline of needing about 20 BTUs per square foot for standard conditions. Adjust this number based on factors such as ceiling height, insulation quality, number of Windows, and the amount of sunlight the room receives. For more precise calculations, consider using a BTU calculator that accounts for these variables.