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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.
You can also choose to install electric heat, which comes from small registers located around the border of each room. Although the cost of installation averages between $1,000 and $2,000, this type of furnace isn't a good idea for heating large spaces and comes with high energy costs. One newer option gaining popularity is a heat pump, which pulls in heat from the air or ground using refrigerant coils.