To calculate the correct heater size for a room:
\[ \text{HS} = L \times W \times H \times \text{IF} \]
Where:
The correct heater size for a room primarily depends on two factors:
Let's assume the following values:
Using the formula:
\[ \text{HS} = 20 \times 15 \times 10 \times 5.5 = 16500 \]
The Heater Size is 16,500 BTUs.