Re: Condensation in ducts
Boy, I'm glad somebody brought this up. Unless you can seal the ducting with a decent vapor barrier material and a decent insulative product, it may be best to put a timer on the blower of the attic system to turn the blower on a few minutes two or three times a day to prevent the moisture issues.
Originally posted by ruud-man
A troubling situation can develop with this type system. I have seen it many times in the mid-west.
In the winter warm moist air rises into the duct/air handler. If the attic is cold enough this moisture will condense no the inside of the air handler and duct.
This causes several problems, one of which is a perfect breeding ground for mold.
The reason I am posting this is to advise that merely closing the dampers on the supply grilles will not prevent air flowing into the system.
Both the supplies and returns should be "tightly" sealed during the heating season.