When to replace duct work?

A well installed duct system might never need to be replaced. Why would anyone need a new duct system? Complete duct system replacements usually come about due to poor quality of the original installation, poor environmental conditions the duct system is placed in, the choice of duct and insulating materials made by the original installer, or a combination of any of these.

This original duct system was metal, insulated with fiberglass on the interior of the duct. The ducts were installed in a damp and dirty crawlspace and had many return and supply joint leaks. When it was installed many years ago the main duct joints, or connections, had been somewhat sealed with duct tape. All of the duct tape adhesive was now dried out and no longer performing. Over the years, these unsealed joints allowed the system to not only leak out heated and cooled air that should have gone inside the inside of the home, but the return leaks allowed dirty crawlspace air in to the duct system. The interior fiberglass insulation became a collector for dust, dirt, moisture and provided a perfect spot for mold to grow.

This duct system was costing the homeowners every month on their utility bill and it was unhealthy too!

Instead of just replacing their HVAC unit, the smart homeowners in this house took this opportunity to improve their indoor environment and reduce their energy bill all at the same time. Along with a new, 14 SEER Trane packaged electric heat pump, they opted to remove all the undesirable ductwork and have an energy efficient new duct system installed. All new joints will be sealed with mastic, a duct joint sealant that outlasts duct tape by decades, and exterior insulation with vapor barrier. A zone system is also being added to solve a cold basement room issue.

New, energy efficient ductwork inside is likely to save this homeowner as much as their new unit on the outside of the house. And they can breathe easier knowing their duct system is moving clean, safe air around their home.