Is it safe to paint a ceiling that has had radiant heat installed in it? The heat system is no longer being used. The ceilings are not "popcorn" but do have a "bumpy" appearance that would likely crumble off if rolled. We are considering a house with 2100' of this type ceiling. It has new central heat/air but we would also want to remove the unsightly controls from each room and cap the wires off in the wall.