Should bedroom air return be _outside_ the bedroom for air circulation?
It’s common to put air returns inside the bedroom, even if the bedroom is its own zone. Would it be better for air quality to put the return outside the room?
Possible reason: in a bedroom, if the bedroom is its own heating/cooling zone, the house is reasonably air-tight, and people sleep with the door closed, CO2 levels can rise by a lot.
My new toy is an AirThings View, an indoor air quality measuring device. What I’ve learned is that CO2 levels rise from 750 to 1400 or more overnight with the door closed. Also, the humidity is a bit higher, partly from us breathing. If we moved the air return to the hall outside the bedroom, we’d get more circulation.
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