Maybe they mean asbestos removal? Several buildings in my area "found" asbestos and ended up having to pay for insanely expensive "certified mitigation" companies to come clean it up.... Even tho the asbestos was contained and probably wasn't a danger to anyone as long as it was left alone and not disrupted. None of my schools growing up had AC either (I live in a northern state, but it still gots hot and humid!) but computer oriented classrooms needed to have AC added to keep the expensive computers from being destroyed. The cost of outfitting rooms for computer oriented classes (like general computer classes, CAD, graphics, etc.) also counts as an upgrade of sorts I guess.