This will further improve efficiency and prevent energy losses.
Floor vent seal.
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If you live in a house with a crawl space there is a good chance the floor vents are not sealed.
Inspect your floor vents.
While it certainly is possible to abandon the under slab ducts and to put ducts in soffits or an attic this.
The good news is that an alternative method of cleaning and sealing air ducts exists.
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Next apply weather stripping around the underside of the vent cover.
The goal is to prevent conditioned air from escaping or unconditioned air from entering the thermal envelope.
To properly seal around air vents apply caulk or expanding foam between the ducting and the sheetrock.
Check to make sure you have a crawl space and that you have air vents coming up through the floor.
Look into the vent right where the ductwork meets the floor.
This is one of those things that can go unnoticed but have.