To start calculating the BTU's required for any room, you initially need to obtain its square video footage by increasing the rooms length by its size. A ceiling height of 8 feet is assumed. To make up for taller ceilings, raise the square video footage by 12% for each and every extra foot of ceiling height. For instance, a 12 x 12 room is equal to 144 square feet. If simply click the following page ceiling elevation were 9 feet we would increase 144 x 1.12 for a total of 161 square feet, Visit This Link.