Ductwork typically lasts 10 to 25 years, depending heavily on the material used. Most HVAC experts recommend inspecting and potentially replacing your ducts around the 15-year mark, as they naturally begin to deteriorate, leak conditioned air, and lose efficiency.
The $5,000 rule is a guideline to help homeowners decide whether to repair or replace their HVAC system. You multiply the age of your unit by the cost of the needed repair. If that number exceeds $5,000, replacing your HVAC system is often more cost-effective.
10 Signs Your Home Needs New Ductwork
Ductwork generally needs replacement every 10–15 years for flexible ducting and 20–25+ years for metal ductwork. While rigid metal can last as long as the home, it often becomes inefficient or damaged around the 15–20 year mark. It is recommended to evaluate or replace ductwork when installing a new HVAC system.
In HVAC duct design, the two-foot rule is a guideline stating that branch ducts (takeoffs) must be placed at least 24 inches away from any air direction change, transition, or end cap. This spacing allows turbulent air to re-pressurize and stabilize, ensuring consistent airflow to every room.
Replacing aging ductwork can enhance the efficiency of your HVAC system, reduce energy costs, and improve the air quality in your home. It's a worthwhile investment for your comfort and well-being.
While homeowners insurance does cover HVAC systems in the event of a disaster like a fire or a storm, it will not cover breakdowns due to ordinary wear and tear. So if you're wondering, does homeowners insurance cover HVAC issues like ductwork problems over time? —the answer is no.
Replacing AC ducts ranges from moderate to difficult for a DIYer, depending heavily on access (attics vs. crawlspaces) and your experience with HVAC systems. While it is physically straightforward, it requires precise sizing, proper sealing to prevent air leakage, and handling bulky, insulating materials.
Larger homes require more materials and labor to replace the entire duct system. On average, the cost ranges from $2,000 to $5,000 for a small- to medium-sized home. However, duct replacement can run as low as $1,400 for smaller homes and as high as $9,000 for larger homes.
The best time to clean air ducts is during spring or fall, as these milder seasons allow your HVAC system to be turned off without sacrificing comfort during heating or cooling extremes. Spring cleaning helps remove pollen and winter pet hair, while fall cleaning prepares your system for heavy heating use.
Top Signs of Bad Ductwork and Ways to Respond
Replacing residential ductwork typically takes 1 to 3 days, though large homes or complex layouts can stretch the job to 4 or 5 days. Smaller, highly accessible systems might be finished in as little as 6 to 8 hours.
Which HVAC Brands Last the Longest?
Roughly speaking, the 'off-season' for the HVAC industry runs from March to May and hits again from September to November. These two periods avoid extreme seasonal temperatures, so the average HVAC company is less busy. This is a great time to get a great deal on a new HVAC unit.
Have HVAC Prices Gone Up in 2026? Yes HVAC prices have steadily increased over the past few years, and 2026 is no exception. These increases are affecting everything from entry-level systems to high-efficiency units, making it more expensive than ever to install or replace HVAC systems.
One of the most common mistakes in HVAC duct fabrication is incorrect measurements. Ducts that are too small or too large for the system or the home will lead to airflow restrictions, energy inefficiencies, and increased noise levels.
For a typical 12x12 (144 sq. ft.) bedroom, you will generally need a 6-inch to 7-inch round duct for the supply register. This accommodates the necessary airflow (around 100–150 Cubic Feet per Minute) to properly heat and cool the space.
For a typical 2,000 square foot home, the cost to install a new HVAC system—including both air conditioning and heating—ranges from $7,000 to $12,000. This estimate includes equipment, installation, and labor. Here's how those numbers break down: Standard Split System (Furnace + Central AC): $7,000–$10,000.
Avoid making guesses or unsupported statements about what caused the damage to your property. Speculating can lead to inaccuracies in the adjuster's report, potentially affecting your claim.
The compressor is the single most expensive part of an AC unit to replace. Often called the "heart" of the system, it pumps and circulates refrigerant.
If you file a claim for a damaged HVAC unit, your insurer may send an adjuster to evaluate the damage and estimate the cost of repairs. You may be asked for photos and video of the damaged unit. If the claim is approved, your insurer may pay to repair or replace the unit, minus your deductible.
If you never clean your ducts, you can expect more than just extra dust around the house. Over time, dirty ducts can reduce your HVAC efficiency, drive up your utility bills, and shorten the lifespan of your heating and cooling system.
In HVAC duct design, the two-foot rule is a guideline stating that branch ducts (takeoffs) must be placed at least 24 inches away from any air direction change, transition, or end cap. This spacing allows turbulent air to re-pressurize and stabilize, ensuring consistent airflow to every room.
The air inside your home is much better with new ductwork installed. If you have old ducts that are dusty, this can affect the quality of the air inside your home. When it comes to indoor air quality, an upgrade to your duct system is a key factor in maintaining it.