If your current furnace is less than 80% AFUE, installing a new gas furnace may be a significant energy-efficiency upgrade. The Department of Energy says that the higher the energy-efficiency rating of your home, the more likely you are to save money on energy bills.⁴ This certainly applies to your heating equipment — which, depending on where you live, could be a big part of your utility bill.

Although both an 80% and a 90+% gas furnace will efficiently heat your home when compared to a less efficiency model, there are initial and long-term operational cost differences that you should consider when purchasing a new heating system.