Your energy bill could increase for a number of reasons. If you have a gas or oil furnace, you should call your energy supplier to ensure there isn’t a leak or a malfunctioning meter. If you have an electric furnace and an abnormally high energy bill, reach out to an HVAC expert to check that all parts of your system are working property. Additionally, clogged air filters or leaks in your ductwork could be the cause of higher energy bills.