This will further improve efficiency and prevent energy losses.
Floor vent seal.
Look into the vent right where the ductwork meets the floor.
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The goal is to prevent conditioned air from escaping or unconditioned air from entering the thermal envelope.
If you do unscrew one of the floor vent covers and set it aside.
Check to make sure you have a crawl space and that you have air vents coming up through the floor.
This is one of those things that can go unnoticed but have.
Next apply weather stripping around the underside of the vent cover.
While it certainly is possible to abandon the under slab ducts and to put ducts in soffits or an attic this.
Inspect your floor vents.
The good news is that an alternative method of cleaning and sealing air ducts exists.
Is there a gap between the metal duct and the floor.
To properly seal around air vents apply caulk or expanding foam between the ducting and the sheetrock.