Learn How Room Size Is Connected to Airflow in Your Home

The room size in homes has a direct effect on indoor comfort and efficiency. That’s because the size of the room is one of the figures utilized to compute the proper volume of cooled or heated air entering that room from the central HVAC system. Known as air balancing, this process ensures that each room receives the appropriate volume of conditioned airflow for all-season comfort.

Room Size Matters

When airflow volume — expressed in cubic feet per minute (CFM) — isn’t appropriate for the square footage of a room, both comfort and efficiency are impacted as follows:

  • If the volume of conditioned air isn’t sufficient for the room size, temperature control is inconsistent and the comfort level for occupants declines noticeably.
  • Conversely, if a room gets too much airflow, heated or cooled air leaks out through cracks and gaps in the structure, wasting energy.
  • Too much or too little conditioned air into a given room can potentially unbalance airflow throughout the entire system.

Getting in Balance

To ensure that air volume is appropriate for each individual room’s size, the system must be balanced. As a rule of thumb, proper airflow into a room should be 1 CFM of conditioned air per each square foot in the room. Here’s a short version of the air-balancing procedure:

  • A qualified HVAC technician measures the air entering a room by placing an airflow hood over the supply air vent.
  • By calculating square footage and the CFM of airflow, the technician can determine whether conditioned airflow is appropriate for the room size to provide optimum comfort control and system energy efficiency.
  • Air volume into an individual room may be increased or decreased if necessary by opening or closing adjustable dampers, which are installed inside supply ducts.

If airflow in an existing home is insufficient in a particular room or an entire area of the house, ductwork issues such as leakage may also be a factor that must be resolved to achieve balance.

To ensure that your HVAC system airflow matches each room’s size, contact Paitson Bros. We’ve been keeping homes balanced for optimum efficiency and comfort since 1922.

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