Hi. As a follow-up to my earlier, somewhat open-ended post, attempting to solve my cold bedroom problems.
My house has a hydronic hot air heating system. The ducting to these rooms runs through an unheated attic (although mostly buried in blown-in fiberglass.) There are the insulated flex-type. There is a continuous ridge vent and 1-1/2" plug soffit vents in every bay. Is it possible that there is cold air coming in through the gable vent, and then blowing out the ridge vent and in the process cooling down the ductwork? And also bypassing the whole purpose of the soffit vents? WHat happens if I close up the gable vent and there isn't enough inflow through the soffit vents?
I live on Long Island, NY. Thanks.