If you do unscrew one of the floor vent covers and set it aside.
Floor vent seal.
This is one of those things that can go unnoticed but have.
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Check to make sure you have a crawl space and that you have air vents coming up through the floor.
If you live in a house with a crawl space there is a good chance the floor vents are not sealed.
Is there a gap between the metal duct and the floor.
The good news is that an alternative method of cleaning and sealing air ducts exists.
To properly seal around air vents apply caulk or expanding foam between the ducting and the sheetrock.
Next apply weather stripping around the underside of the vent cover.
This will further improve efficiency and prevent energy losses.
Inspect your floor vents.
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The goal is to prevent conditioned air from escaping or unconditioned air from entering the thermal envelope.