Hello, I would think that if you insulated the floor space with spray foam then panel it off would be good, but pray you don't have to do any floor work or plumbing work under the house.. maybe just use batt insulation and close up with panels, build a cover around the duct work with 1 1/2 inch foa...

Sorry read as many posts as I could and many get close but none answer why can't I use an alternative to the underbelly design. Double wide fully wrapped with conventional siding and sitting on a concrete motared block foundation. AC has been moved to the crawl space and it seems that most if not Al...