This is probably a silly question, because I can't seem to find an answer. I have a heat pump in the attic of my house that heats and cools the upstairs. There are two tubes coming out of the unit. One is thin bare copper. The other is larger and has foam insulation around it. Both tubes run down through the closet and out the side of the house near the floor. I think they both get hot at times. Do you think it would it be OK to put fiberglass insulation around them and put a temporary cover over them in the closet?