What is air balancing and why is it important?

• A. Sealing duct leaks
• B. Replacing filters
• C. Measuring room temperature only
• D. Adjusting dampers and diffusers to achieve proper airflow distribution and comfort.

Answer: (D)

Air balancing is about making sure the system delivers the right amount of conditioned air to every room or zone so comfort is even and the system runs efficiently. The way this is done is by adjusting control devices like dampers in the ductwork and diffusers at the vents to direct more air to spaces that need it and reduce air where it’s overproviding. When these controls are set correctly, airflow is distributed according to design, which minimizes cold or hot spots and helps the system operate at its intended efficiency.

Sealing duct leaks improves overall efficiency by preventing air loss, but it doesn’t actively manage how much air goes to each room once the system is running. Replacing filters changes the resistance in the system and can affect airflow, but it’s not the practice of balancing. Measuring room temperature alone tells you how a space is performing after the fact, not how to adjust the flow. So adjusting dampers and diffusers to achieve proper airflow distribution and comfort is the essential action of air balancing.