Dear Ken: I’m wondering what’s wrong with my central air. We have it set at 72, but the house stays in the 80’s. Do we need to get it checked?—Marti
Probably, but here are some things to do first. Make sure your furnace filter is clean; it needs to be changed no less often than once a month in the summer. Also, check that you haven’t blocked any of those cold air return grilles. Sometimes they get behind a sofa or bookcase and we forget...