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Question DetailsAsked on 11/1/2015

how much should a new gas furnace cost

I need a furnace in a 1700 sq. ft. house, 2 stories, with no current furnace and no ductwork. New furnace will go in the basement next to an existing chimney where there appears to have once been an old furnace. The gas piping is already there.

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You can find some ideas from prior questions (though most of them are for furnace only not ductwork too) in the Home > HVAC link in Browse Projects, at lower left.

A lot of the cost variability will be in whether the ducting can be installed primarily through open, accessible areas - attic and running below open joist crawspace or basement for instance; or has to cut into drywall walls and ceilings and such, which can add from $500-1000 in simple cases to well over double that to the cost in difficult cases.

Of course, the furnace cost itself will depend on what size unit you need for your house construction and climate, and what efficiency and brand you go with - but VERY, VERY rough ballpark I would expect, for a normal cost area, 80% (low-end efficiency) but reputable furnace brand, and mid-range climatic conditions (say the midwest or mid to northern Atlantic area of the US), pretty unlikely under $5000 and possibly closer to $7-9,000, especially when you take into account repair of the opening up needed to run ducting. High efficiency or difficult duct running situation likely somewhat over $10,000.

And I would NOT recommend flex ducting - cuts the initial cost, but essentially uncleanable, comes apart and tears easily, and much higher resistance to airflow than galvanized steel box ducts.

Answered 4 years ago by LCD

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