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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.
This cost can range between $750 -$3000 depending on the brand, size and the model. The average cost for a new furnace is approximately $1,400 for the unit and includes no other elements costs which are used for installing the furnace.