This month, let’s talk about the furnace controllers that have shown up on 80%- and 90%-AFUE furnaces in the last 10 years or so. These are the mysterious boxes with all the wires emanating from them that control the entire furnace. I don’t know about you, but when I see one of these magic boxes for the first time, my stomach turns.
I have an innate fear of electronics. I don’t feel too bad, though, because I’m in good company.