Gas Furnace Installation Costs – How Much You Should Pay

If you are shopping for a new furnace, it is normal to question gas furnace installation costs – how much you should pay.  In this gas furnace guide, you’ll gain a clear idea of what range of costs you’ll face to have your new furnace installed.   In some cases, as with value-priced furnaces, the cost to install the furnace will be greater than the purchase price of the furnace.  In many cases, it is about equal and for high-end furnaces, the furnace price may be the greater of the costs.

Gas Furnace Installation Costs in New Construction

HVAC installers love new construction installations.  Today’s homes are better designed for the installation of equipment, with larger space dedicated to the furnace.  Plus, in new construction, they usually don’t have to work around the family’s accumulated “stuff.”  Running the gas line and venting as well as installing the plenum is easier in new construction.

In any home, the ease of installation will vary.  Placing a furnace in a first-floor utility closet is always easier than putting it in the attic, for example. So the specific circumstances of the job will affect how difficult it is and how much time it takes, and those factors will affect price.  Also, standard efficiency furnaces have to be vented through the roof because the exhaust gases are very hot.  High efficiency furnaces can be vented through the wall at much less expense.

Installation costs in a new home or addition: $1,400-$2,500

Gas Furnace Installation Costs in Existing Homes

Costs will be higher in existing homes for several reasons.  First, an old furnace usually needs to be disconnected, removed and properly disposed of.  Secondly, space is often more cramped because the basement is finished or the attic is also used for storage.  There’s less room in which to work.  If an old vent has to be replaced, that can often be more time consuming and costly than running a vent in new construction.  These issues all affect the price of installation in existing homes.

Installation costs in an existing home: $1,600-$3,000


These are the costs for installation of the furnace only.  If you are having an entire HVAC system installed complete with a central air conditioner, whole-house humidifier or ventilator, or air purification system, your costs will go up accordingly.  These costs also do not include ductwork.

Knowing how to budget for building a home, adding an addition or updating your HVAC system is important.  These cost ranges are accurate and will help you put your plan and budget together.

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  1. Tony Li
    Posted November 12, 2011 at 6:14 pm | Permalink

    Please provide estimates for a new furnace and installation to an existing home that is 2300 sq ft.

    Preferred models:
    Goodman GMVC95
    Lennox Elite G61V
    Carrier Infinity 96

    Thank you.

  2. admin
    Posted February 27, 2012 at 8:47 pm | Permalink

    Please go here for quotes specific to your house and situation.