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The Cost of Ductwork

By Kevin Brouillard · June 03, 2021 · 6 minute read

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The Cost of Ductwork

There’s a lot that goes into making homes safe and comfortable. After plumbing and electric, many homes in warm and cold climates alike have heating, ventilation, and air conditioning (HVAC) systems to regulate temperature and air quality.

Installing or updating HVAC typically requires ductwork to effectively move air from the system to vents throughout a home or building. There are several factors that impact the cost of HVAC ductwork, including the size and layout of a home, materials used, and type of system.

This guide will give you the basics of how HVAC ductwork operates and key cost considerations.

What Is Ductwork?

In the broadest sense, ductwork can be defined as the channels used for transferring heated and/or cooled air through the rooms and zones of a home or building.

In many cases, HVAC systems need separate supply and return ducts to circulate, filter, and treat air continuously. Supply ducts bring air from the furnace, geothermal pump, or other type of system to blowers and vents to heat or cool an area. On the flipside, return ducts transport untreated air back to the HVAC system.

Some of the most common HVAC systems that need ductwork include:

•   Geothermal or ground source heating and cooling.
•   Central air conditioning.
•   Furnaces.
•   Central gas heating.

Between these different systems and a home’s unique characteristics, ductwork can be handled in a variety of ways.

Installing New Ductwork

Figuring out how to install ductwork varies in complexity and cost between new construction and finished and furnished home.

Additional steps that may be necessary for a finished home, such as cutting holes in existing walls, ceilings, and floors, may likely drive up the price of labor and require more materials and time for installation. Depending on where the system is placed, ducts may be run through closets, attics, basements, or up stairwells.

Since different homes require different amounts of ductwork, it’s helpful to think of cost on a linear foot basis. New ductwork can cost about $10 to $20 per linear foot on average, with the variation coming down to costs for materials and labor.

A home smaller than 2,500 square feet can expect to need up to 150 linear feet of ductwork, which could potentially cost between $1,500 and $3,000 to install.

Homes ranging in size from 2,500 to 3,500 square feet could need 250 linear feet of ductwork, with the total potential cost ranging between $2,500 and $5,000.

This means ductwork can be more expensive than fixing a plumbing leak and many other common home repair costs.

If you’re building a new home, including plans for HVAC ductwork from the getgo could reduce the overall installation cost. For starters, it would bypass the need to retroactively cut holes throughout a home for ducts and vents.

Additionally, it may be easier to design systems that utilize fewer linear feet since ductwork can be installed before walls and floors are completed.

Replacing Ductwork

If your home is already fitted with ductwork, replacing a portion of it or the entire system might be necessary due to leaks, cracks, or reduced efficiency over time. Since ducts are usually kept out of sight behind walls and ceilings or in attics and basements, accessibility is a key factor in repairing a system.

The replacement process involves both removing the existing materials and installing new ductwork. Replacing ductwork can cost from $12 to $25 per linear foot depending on the location of the existing system and choice of materials for the new ductwork.

Exposed ductwork can be easier for you to reach and replace on your own, but a professional contractor may be necessary for more complicated repairs and getting to concealed HVAC systems.

Additionally, a skilled professional could likely complete the job in less time than a DIYer might, and time may be a more pressing factor than money in the middle of a cold snap or during a heatwave.

The U.S. Environmental Protection Agency’s EnergyStar program recommends getting quotes from contractors with North American Technical Excellence (NATE) or Building Performance Institute (BPI) certification to get the job done right on the first try.

Recommended: The Cost of Buying a Fixer-Upper

Ductwork Materials

There are several types of materials to consider when planning how to install ductwork in a home. Broadly speaking, ductwork can be categorized as flexible or rigid, with options for materials within each category. Each comes with tradeoffs in terms of price, lifespan, efficiency, and flexibility.

Flexible Ductwork

True to its name, flexible ductwork is characterized by its ability to bend, which can come in handy when installing inside tight and tricky spaces.

In most cases, aluminum or non-metallic materials like plastic, polyester, and PVC are used for flexible ductwork. Let’s take a look at how they compare.

Flexible Aluminum: Costs between $2 to $5 per linear foot (excluding labor).

Pros:
•   Ideal for installing in hard-to-reach places.
•   Longer lifespan than non-metallic flexible ductwork.
•   Generally cheaper than rigid ductwork.

Cons:
•   Poor energy efficiency without added insulation and sealing.
•   Needs to be reinforced to minimize kinks and bends to improve airflow and efficiency.

Flexible Polyester, Plastic, PVC: Costs between $1 to $4 per linear (excluding labor).

Pros:
•   Useful for compact spaces.
•   Generally one of the cheapest options.
•   Resistant to mold and rust.

Cons:
•   Prone to tearing and less durable than flexible aluminum.
•   Needs to be reinforced to minimize kinks and bends to preserve airflow and efficiency.

Rigid Ductwork

Rigid ductwork can be made from several materials, such as fiberglass and galvanized steel or aluminum. These options can also vary in shape (e.g., cylindrical or rectangular) and size. Additionally, there are differences in cost and features for each type of rigid ductwork.

Sheet Metal Ductwork: Made from galvanized steel or aluminum, these materials usually cost anywhere from $3 to $10 per linear foot.

Pros:
•   Greater durability than other materials.
•   Can produce less noise than flexible ductwork.
•   Less susceptible to mold and mildew.

Cons:
•   Difficult to install if there isn’t space for long, straight lines of ductwork.
•   Adding insulation may be required for greater energy efficiency.
•   More expensive than flexible ductwork.

Fiberglass Ductboard: Consisting of metal ductwork lined with fiberglass, this option costs between $4.50 and $6 on average.

Pros:
•   Built-in insulation improves energy efficiency and temperature control.
•   Easy to cut and seal.
•   Well suited for installing between a building’s rafters or floor joists.

Cons:
•   Over time, they can release fiberglass particles into the air and be susceptible to mold and mildew.
•   Can be difficult to clean.
•   Often the most expensive option per linear foot.

Sealing and Insulation

Depending on the structure of a home, the type of HVAC system, and other factors, sealing and insulating ductwork may be necessary for health and safety concerns. It might also improve the efficiency of a system, thus potentially lowering your energy use, and may help pay for itself through lower utility bills.

In fact, leaky ductwork can reduce the efficiency of a HVAC system by as much as 20 percent .

If combustion is involved in your HVAC system, which is generally the case for furnaces and central gas heating, harmful gases like carbon monoxide are generated in the process. Sealing ductwork can further safeguard that such gases are not circulated into the living space of home instead of being emitted outside.

While professional contractors are recommended for sophisticated ductwork insulation and sealing jobs, homeowners may choose to take a DIY approach to sealing near vents and other ductwork connection points with metal tape. These locations, especially vents, can be more accessible and are more common locations for leaks.

How Often Should Ductwork Be Replaced?

While we may immediately notice when the power goes out or the plumbing is backed up, it’s harder to tell if we’re getting the most out of a heating and cooling system.

Maintenance and cleaning can help extend the lifespan of ductwork and heating and cooling systems, but a time will come when replacement is a safer and more financially sound choice.

Erring on the side of caution, you may want to have a heat pump or air conditioner (including ductwork) replaced if it’s more than 10 years old. For a furnace, the estimated lifespan is around 15 years.

To keep your ductwork in tiptop shape, there are some maintenance tasks, like changing air filters monthly, that can be done on a DIY basis. More complex procedures, such as cleaning blowers, checking electrical connections, and lubricating mechanical parts, may be better handled by a professional contractor.

Having a maintenance checklist handy can be helpful for staying on top of your cleaning and maintenance schedule, as well as making sure a contractor checks all the boxes when inspecting your HVAC system.

The Takeaway

Whether saving ahead or responding to a sudden home repair cost, there are options available for paying for HVAC ductwork.

Installing energy-efficient heating and air conditioning systems may qualify for a residential energy property tax credit. Additionally, some states offer incentives and rebates, such as the New York State Heat Pump Rebate Program.

Although helpful, these incentives and tax deductions still leave a portion of the cost to the homeowner. It can sometimes be difficult to save for potentially pricey repairs like these if a budget is already stretched thin.

Unsecured home improvement loans with SoFi have no fees and don’t require home equity as collateral. With low, fixed rates and a set term with a payment end date, a personal loan might save you thousands on total interest compared to a credit card when using it to pay for expensive home repairs.

Dealing with leaky ductwork? Check out SoFi home improvement loans to help pay for the repairs.



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Tax Information: This article provides general background information only and is not intended to serve as legal or tax advice or as a substitute for legal counsel. You should consult your own attorney and/or tax advisor if you have a question requiring legal or tax advice.
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