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If you want to convert from an electric furnace to a gas furnace, you will need to have gas piping and ductwork installed first. This will add an additional up-front cost to the furnace and installation process of around $5,000 to $15,000 or more depending on the space.
Gas furnace costs range from $1,700 to $5,000, including installation, for low-to-moderate efficiency systems, depending on the size of the furnace required by your home.The lowest annual fuel utilization efficiency (AFUE) rating allowed by the U.S. Department of Energy for a gas furnace is 80 percent.as furnace costs range from $1,700 to $5,000, including installation, for low-to-moderate efficiency systems, depending on the size of the furnace required by your home.