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Calculate the required airflow (CFM) for your HVAC system based on room size, BTU capacity, and air changes per hour.
Floor area of the room
System cooling capacity
CFM stands for Cubic Feet per Minute and measures the volume of air your HVAC system moves. Proper airflow is critical for comfort and efficiency. Too little CFM means poor cooling and hot spots. Too much causes noise and wasted energy.
The BTU method divides your system's cooling capacity by 1.08 times the temperature differential. The air changes method multiplies room volume by desired air changes per hour, then divides by 60. Use the higher value for adequate airflow.
Standard rule: 400 CFM per ton. A 3-ton system needs ~1,200 CFM. Humid climates may use 350 CFM/ton for better dehumidification; dry climates may use 450 CFM/ton.
Low airflow is often caused by dirty filters, failing blower motors, collapsed flex duct, or undersized ductwork. A simple filter change or blower wheel cleaning can restore proper CFM.
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