What to know
Why there is no interval
Sealing is a repair, not a service cycle. Once a joint is properly sealed it should stay sealed, which is the whole point of doing it with a material that stays flexible rather than tape that dries out.
So the honest framing is not how often, but whether it has been done and whether it is still holding.
What brings it back around
- Building or remodelling work, where runs get opened, moved, or disconnected and not always put back properly.
- Age, particularly in systems sealed with cloth tape that has had two decades to dry out.
- Anything that stresses the connections, such as storing weight on ductwork in an attic.
- A previous repair done cheaply, which held for a few years and then let go.
How to tell whether yours is holding
Look at an accessible joint in an attic, crawl space or basement. A sound seal looks like it was painted on and has stayed where it was put. Tape curling away from a joint is visible from several feet, and it is the most common thing we find.
Inside the house, the signal is a room that used to keep up and no longer does, particularly one at the far end of the system.
What to be careful of
Any company offering duct sealing on a recurring schedule, or quoting a frequency before seeing your system, is describing their booking calendar rather than your ductwork.
How to find out where you stand
Sealing is not a service anybody should buy from a website. It depends on how your ducts were built, what condition they are in now, and whether the runs that matter are reachable — none of which can be judged from a page.
So the next step is a look. Ours is free, we will show you what we find, and if your ductwork is sound and simply needs cleaning, that is what we will tell you.