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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.
Labor Costs. Installation of the new furnace will add an extra $400 to $600 to the purchase price. It typically takes less than 10 hours for a contractor to install a new furnace.Most contractors will include removal of the old furnace as part of the quote, but some contractors charge an additional fee.lectric forced-air heating systems feature a unique design that is easy to install within an existing central-air system. The design also cleverly allows for the future addition of central air conditioning.