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Should You Close HVAC Vents in Unused Rooms?

The truth behind this damaging myth.

Written by Tessie Devlin

Edited by Jamie Cesanek

Last updated 10/27/2023

Serenethos/iStock/Getty images

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Key Points

  • Closing HVAC vents in unused rooms may damage your system, leading to costly repairs.
  • Your heater or air conditioner produces the same amount of air regardless of how many open or closed vents you have.
  • To keep air flowing through your home and save on electricity bills, you shouldn’t close more than 75% of your vents.
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