To clarify, pretty sure we have been misidentifying floor furnaces as floor vents. The floor furnaces were forced air at that one large floor vent only. The newer systems with floor or ceiling vents are whole house systems
I worked on many, many older homes in Berkeley/Oakland, CA that had floor vents back in the 80s. The next generation of houses had a single wall heater about 5’ high that might feed one side of the wall or both
Wonder if Sheeta is saying Sheet right about now