I have two story house and downstairs is always colder. Head feels fine but feet are cold and you can feel cold coming from the floor. The house have no basement but is built on a concrete slab. The living room is on 2 inch raised floor. I have one opening and was able to see that the raised floor have perfect passages from one side to the other. There aren't any fire breakers. I realized that I could somehow direct hot air from some of the duct and make the floor warm.
Is something like this feasible or is there something that just do that or similar?
I found air radiant floor heating but that's inside concrete.