Calculate the right BTU capacity for your window air conditioner based on room dimensions. Get instant recommendations for optimal cooling efficiency.
Calculate Required BTU
How to Calculate Air Conditioner Size
Determining the right size air conditioner for your room is crucial for optimal cooling efficiency and comfort. This guide explains the calculation method used by HVAC professionals to select the appropriate BTU rating.
Air Conditioner Size Formula
The basic formula for calculating required BTU capacity is:
\[ BTU = A \times 20 \]
Where:
BTU = British Thermal Units needed for cooling
A = Room area in square feet (length × width)
20 = Standard BTU requirement per square foot
To calculate room area:
\[ A = L \times W \]
Where:
L = Room length in feet
W = Room width in feet
Calculation Steps
Measure room length and width in feet
Calculate room area by multiplying length × width
Multiply area by 20 BTU/sq ft to get required capacity
Round up to nearest standard AC unit size
Example Calculation
Problem:
Calculate the required AC size for a room with:
Length = 15 feet
Width = 12 feet
Solution:
Calculate room area:
\[ A = L \times W = 15 \text{ ft} \times 12 \text{ ft} = 180 \text{ sq ft} \]