1. Gaze at Your Partner's Photo You have no idea just how much the efficiency and function of your appliances and installations depend upon how clean these are. Here is a great example on what the general cleanness of your furnace filter can in fact improve how your property is heated over the winter season. A dirty furnace filter's a recipe for the cold home, but large energy bills nonetheless. Do yourself a favour and learn to clean and change a filter, to help you avoid these issues.