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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 average gas furnace with a 90% AFUE (thatâs the rating that determines just how energy-efficient your furnace is) will cost you about $2,500 (and, of course, that doesnât include installation costs.Count on spending about $2,000 to have your new furnace installed).ompare that to the average oil furnace â which will cost you about $2,000. Sure, thatâs a big difference, but youâll also get a lower AFUE. Electric furnaces are also an option, but theyâre the most expensive option. On the bright side, though, theyâll also last the longest.