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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.
The size of the system determines the labor hours involved to build the system. To outfit a house with the ductwork and vents can cost as much as the brand new furnace or more when you consider installation fees upwards of $50 per hour.igh-efficiency models cost more, but save more over the long haul. Prices for gas furnaces in March of 2013 range from $1,700 for the low-efficiency models up to $12,500 for high-efficiency models.