i'm trying to do some research on ac duct for new a/c i was planning on getting a package a/c unit is there any metal ac duct or what duct would u use based on my circumstances, i once live in a house that have a termite we could not use the a/c because they cut hole in the a/c duct we termite the house but give it a year or so the same problem so for my new home i was thinking about metal or firber glass or something that's hard to cut what would u reccoment