No, floor vents will not help in cooling your house since they are only used when your air conditioner is on. Fans are the cheapest way to cool a home down.
thermal vents
thermal vents
thermal vents
the middle vents only supply air from the ac unit using a separate in dash fan. the floor and defrost vents come only from the heater
I believe the upper vents are for A/C only. The floor vents are for the Hot air. Test your ceiling controls by moving the knob from cold to hot, you should hear the air pass from upper vents to lower vents. Providing of course you have selected REAR from the front control panel.
Heating vents should be located near the floor since hot air rises. If the heating vents are located near the ceiling the heat would stay there and not warm the room.
in the floor.
Yes vents can be in the floor instead of the wall.
on the floor on the floor
Because heat rises. Ergo, if they were located by the ceiling, it wouldn't warm the whole room efficiently.
hot springs on the sea floor that pump out superheated water from inside earth.
should be on floor.