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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. The maximum average cost to buy and install a forced-air gas furnace is $1,600. The minimum average cost to buy and install a forced-air gas furnace is $1,300.It is never a bad idea to consult an HVAC specialist, such as a local technician, before making a decision on which type of system is right for a home.omeowners hiring an HVAC company for forced-air gas furnace installation should be aware that the average cost for the furnace unit itself is generally around $800. Because labor can take up to 8 hours or more, installation costs tend to make up a decent chunk of the total expense.