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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.
Although the cost of installation averages between $1,000 and $2,000, this type of furnace isn't a good idea for heating large spaces and comes with high energy costs. One newer option gaining popularity is a heat pump, which pulls in heat from the air or ground using refrigerant coils.