We have to get a new furnace before the fall. What should I look for, to get the one that uses the least fuel?

When you’re shopping for a new furnace, the first fuel-saving step actually has to do with your house. A well-insulated, air sealed building is easier to keep warm in the winter (and cool in the summer), so your heating (cooling) system doesn’t have to be on as often. Also, a “tight”, well-insulated house may not need as big a furnace. So, to prevent overspending on an oversized furnace, and then overspending winter after winter for heat, button up your house first. The most comprehensive and energy-saving approach is to work with a professional. Visit our Home Performance section for a list of local Home Performance with ENERGY STAR^® contractors, information on rebates, and more.

After your home improvements are done, tell the person who services your current furnace that you’re looking for the best energy-saving furnace for your house and budget. Ask for help identifying a model that’s the right size, with a high AFUE (Annual Fuel Utilization Efficiency), and an efficient motor. Other efficient features on newer furnaces include modulating burners, which vary the amount of fuel burned based on weather conditions, and multi-speed blowers. Thanks for writing in.

Li Ling for Ask The Home Team