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However, all of that energy efficiency comes at a price! 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).
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.