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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.
Upfront Costs. Electric furnaces represent one of the cheapest forms of central heating system in terms of initial investment. The unit itself costs between $1,000 and $1,500, as of April 2014, according to QualitySmith.com. Depending on your needs, installation costs could potentially approach $1,000 to $2,000. By comparison, a high-efficiency gas furnace costs between $4,000 and $5,200 installed, based on a 2014 estimate by Galt Technology Inc.