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Question DetailsAsked on 4/28/2016

After removing a cold air return vent for an exterior door, should we install a new one vent.

We added an exterior door to a first-floor bedroom. We had to take out the cold air return vent. Is that going to be a problem? Should we add a new one? We have central air throughout the house.

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If you do not, then you will have heat and A/C coming into that room but not returning to the HVAC system directly - it will have to return under the door and through hall. This may or may not result in poor heating and cooling performance in that room, and might unbalance the system elsewhere on that HVAC branch so not a good idea to leave as is as least without the advice of a Heating and A/C contractor. In the worst case, in a unit with limited return vents, could starve the furnace/air handler for airflow and cause it to pull in unfiltered air through joints in the ducting and such, making your airflow dirtier.


Also, if there is not adequate undercut on the door for a room with HVAC register and no return (typically about 1 inch clear) then that room will pressurize when the HVAC system is on - promoting air loss through the window(s) and outside door, which is energy inefficient. May also promote odor and moisture retention in that room, so generally a bad idea to not have a planned return route in or from all rooms with a feed register.

Answered 2 years ago by LCD




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