Will Closing Vents in Unused Rooms Lower Utility Bills?

February 18, 2019

Here in Texas, energy costs can be high for homeowners in the summer. Some people believe it is a good idea to save energy by closing off vents in unused rooms. While this seems like a logical idea, the strategy can actually be very costly and lead to major damage in your HVAC system.

Why Closing Vents to Unused Rooms Does Not Save Money

Your HVAC unit relies on a certain air pressure being able to circulate through the system. When you close off some air vents, higher than normal air pressure is created. Other parts of the unit attempt to compensate for the air pressure being too high.

Your HVAC unit is designed to send the same cool or warm air volume through despite the fact that some of the vents are closed. Thus, no energy is saved by closing vents.

How Closing Too Many Vents Can Harm Your HVAC System

Since other parts of the HVAC system try to compensate for the high air pressure, this can cause costly damage to your system. Most people have HVAC units with PSC blowers. These blowers detect the amount of airflow in the system. They are designed to reduce the airflow whenever the air pressure in the system is too high.

If you’re running your air conditioner in the summer and have closed some vents, the blower will respond to the higher air pressure by sending less air through the entire system. This lower air output can cause the evaporator cooling coil to freeze up. A frozen evaporator cooling coil can lead to a damaged compressor unit.

In the winter, closing off too many vents can overheat and crack your heat exchanger if the PSC blower lowers the air output. Thus, closing the vents in your HVAC system will not reduce the energy output or the costs of operation. Closing off too many vents might backfire and lead to HVAC damage and expensive repair bills.

If you ever need help with repairs, installation or maintenance, you can turn to the professionals at Hunter's Air & Heat, Inc.. We are your local Carrier Factory Authorized Dealer in the Wharton area. Contact us today to learn more about our services.

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