While energy-efficient gas furnaces save money over time, regulations as of 2015 ensure that all furnaces are far more efficient than those used in the past. Homeowners who use furnaces regularly may want to opt for more efficient systems.
Boiler systems offer greater efficiency than furnaces, and heat pumps can be more economical in temperate areas. Some of the greatest energy savings, however, come from upgrading duct systems. In some cases, simply adding appropriate duct insulation can lead to substantial savings above what an upgraded furnace can provide. Experts also advise that installing better home insulation and sealing any leaks are some of the cheapest ways to save on heating costs.