You may find it hard to believe, but I have seen worse. The blower motor could not breath and was over heating on a regular basses. And then in the middle of the night, in the middle of a cold snap, in Anchorage Alaska this blower motor quit. If these people were not home at the time, there whole house would have froze, all there pipes would have broken and even there toilets would have cracked and would have needed to be replaced, believe me I have seen it happen. All for the cost of a filter.