Running with no filter in furnace - Is it okay?
You might be staring at an empty intake slot right now wondering if you can get away with no filter in furnace for just a little while. Maybe you realized the old one was caked in grey fuzz, tossed it in the trash, and then realized you forgot to pick up a replacement at the store. It's a common predicament, especially when the house is getting chilly and you just want the heat to kick on. ...