Hello All, I am wanting to get prepped for winter this year, last year my bills were outrageous. My flex duct-work is an overall mess. Too many bends and folds, a lot of ups and downs(not enough hanging points). MY duct work runs under my house.. in a crawl space.. the first year I lived in the house I had a mouse invader who chewed at least one hole in the duct work(fixed kinda with duct tape). I plan to find more holes, what is the proper way to seal the holes in the duct work, if any? I imagine I want to re-insulate it some how.. and re-seal the duct. Thanks!