Avoiding these fiveHVACmistakes will help keep yourenergybills low and your house warm this winter. Having a Clogged and Dirty Air Filter.Avoid high energybills by keeping your HVAC system in tip-topcondition. Book your HVAC tune-up with the HVAC pros at Bell Bros. The air filter is an integral part of your HVAC system. It keeps dust and debris from entering the furnace, which could damage the blower, burner, and other parts. Additionally, if you don’t change the filter regularly, it can cause problems in your home and raiseyourenergybills. Discover thetopfivemistakes homeowners in Milwaukee and surrounding cities often make with their HVAC systems—and how to avoid them.However, common mistakes can leave you with higher energybills, an uncomfortable home, or costly repairs. An HVACmistakeis not changing your air filter regularly. Dust and debris build up inside the unit and reduce its ability to effectively cool or heat your home. This can also cause premature wear on parts of the system, which will increase yourenergybills. This winter, avoid these 5mistakesthat drive up your heatingbill. Having a Clogged and Dirty Air Filter Air filters are designed to remove dirt and debris from the air circulating through your home. Take some time and check out these fiveHVACmistakesthat drive up your heatingbill and consider some simple tweaks to help lower your bills this season. Not Changing Your Air Filter. Below, we’ll share some of the most typical heating and cooling mistakes we encounter thatare bad for your HVAC system and drive up yourenergy costs.