If you are one of those people who don't think about the heater until it's freezing and you need to adjust the thermostat, I'm here to tell you: Your heating system needs your attention now. A few simple steps in the fall will mean you're not waiting for an HVAC tech to come out for an expensive weekend service visit on the coldest night of the year. Even if you're the type who religiously changes the filter in your furnace, you can still improve your system's efficiency and save yourself some money.