Metal HVAC ducts are famously leaky.
Metal HVAC ducts leak air. Metal HVAC ducts leak energy. Metal HVAC ducts leak money!
One example is shown in the photo to the right.
This is a duct in a house built in 1979. The seams in the photo have been leaking for all that time.
You can see the stains where air has blown out over the years.
This is one of perhaps a few hundred places where the duct work is leaking - at seams and joints, where the ducts meet the floor registers, and inside walls.
Think of the energy loss over time! Can you say "Money, money, money," boys and girls?
More modern duct work is flexible and insulated. But even when metal duct work is used today it is sealed in two ways - with a latex "paint," which is more like peanut butter spread over seams and joints, or aluminum tape.
Either method works well to seal the duct work.
Either method will save a lot of energy and money.
Either method should be used to every extent possible with older duct work such as this.
Of course metal ducts are a favorite place for ghosts to reside. My ghost friend Mosby, who seems to follow me everywhere, can be seen waving in this thermal image.
My recommendation: with energy savings the little things can go a long way. Sealing metal duct work will save on the energy bills, of course, but also will blow more conditioned air into the house where you want it. The entire system works better and the house is more comfortable. Doing so is HIGHLY recommended. And ghost approved...
Jay Markanich Real Estate Inspections, LLC
Based in Bristow, serving all of Northern Virginia.
Office (703) 330-6388 Cell (703) 585-7560