Airflow through your HVAC system is a circle that integrates separate supply-air and return-air systems to keep your home comfortable and healthy. Supply air is the cooled or heated air from the AC or furnace that is distributed throughout the house into rooms via the supply ductwork. Return air, meanwhile, is removed from rooms and flows back through return ductwork to the indoor air handler to be filtered, then heated or cooled again by the furnace or AC. Conditioned air then cycles back into the supply ductwork to maintain the desired thermostat setting and optimum comfort in all rooms.
Issues that may affect the volume of air returning to the system include:
- Closed or obstructed return vents in individual rooms.
- A clogged system air filter.
- Leaky or disconnected return ductwork.
Why Return Air Matters
While the heated or cooled air entering rooms through supply vents may seem like the most vital part of the HVAC system, returning air is critical too. Issues like consistent comfort, monthly operating costs, and even safety can be impacted by insufficient return flow through the system.
- A furnace needs continuous flow of adequate air back to the unit to ensure vital heating components such as the heat exchanger do not overheat and become permanently damaged.
- The central air conditioner also requires adequate air return. If return flow is below specifications, ice may form on the AC evaporator coil, eventually blocking airflow entirely and causing the unit to shut down.
- Low airflow in the return ducts also reduces efficiency of the system air filter, degrading indoor air quality.
Keep the Airflow Flowing
HVAC service by a qualified professional helps support proper return air function. Measuring system air volume, inspection of ductwork for leaks, checking air-filter condition and blower output all combine to maximize return flow and ensure HVAC performance and efficiency.
For more information about keeping return air up to specs, contact the HVAC professionals at Ace Hardware Home Services.
