HVAC uses of flexible air duct have grown exponentially over the last two decades, all over North America. Contractors and installers say they like it, and some find it indispensable. It has changed ...

CHANGES in outdoor weather often produce baffling changes in indoor conditions — things that never leaked before suddenly leak. Drafts develop in previously calm spaces. And for one reader, cold ...

Question: I have a question about my air conditioner. The air handler in the attic gets a lot of mildew on the outside of the unit and around the ductwork. Mildew builds up in the drain pan and then ...