Thinking about replacing all my ducts (old steel ducts, that are rusted), with new flexduct, and taking out all the ducts in my crawlspace.
1. What questions do I need to ask a contractor when they come out regarding parts, materials, etc??
2. If I may be building a 2nd floor to my home in a few years should I wait until then, in case I need to do futher major revisions to the HVAC system?
3. The heater is inside the home in a hall closet... if I add a 2nd floor, would they probably install a second heater, say in the garage for the upstairs, or redo the ductwork so the same location can "power" the entire house.