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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 Costs. 1  The average maximum cost reported for furnace humidifier installation is $450. 2  The average minimum reported cost for furnace humidifier installation is $370.