How much a furnace should cost. Average costs and comments from CostHelper’s team of professional journalists and community of users. Replacing a gas furnace can cost.The cost to Install a Gas Furnace starts at $, $, per furnace, but varies significantly with common options. Get real costs for your SPECIFIC project .HomeAdvisor’s Furnace Cost Guide lists pricesociated with installing or replacing a furnace including labor and materials, as reported by HomeAdvisor customers..Consumer guides to the cost of home furnace heating systems. Compare new furnace prices, replacement and installation costs, repairs, wholesale pricing and more..
Gas Furnaces $, to $,. Natural gas furnaces often cost a bit more than electric, and unless you re replacing an existing unit, they come with the added expense of putting in gas lines from the street and building extensive ductwork.. The most important thing to consider when determining your new furnace cost is the energy source. Typi.y, unit costs for electric furnaces are the least expensive, followed by gas and then oil furnaces. Check out the following chart for a better idea of furnace prices based on your energy source..