Ceiling vents should generally blow air away from windows. This helps to circulate air throughout the room and prevents cold drafts from hitting occupants directly. By directing air away from windows, you also promote better overall heating or cooling efficiency, allowing for a more comfortable indoor environment.
should be on floor.
Thanks for answering the question Should ceiling vents be directed towards the window or the room? NOT
on the floor on the floor
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.
Ceiling. Cold air fails
Vents should be situated near windows. Windows that are north or west facing should get a vent before a south or east facing window would get one. (Assuming that the vents also supply heat.)
If your air and heating vents are blowing from the ceiling, your ceiling fan should blow air downward to help circulate the air in the room. This can help distribute the heated or cooled air more efficiently and create a more comfortable environment.
up in the summer and down in the winter
Cool air falls toward the floor. Deflectors shouldn't be necessary unless the vent is behind a curtain or something, or if you want to deflect the cool air toward your easy chair.
Heating vents are typically placed near the floor to ensure better air circulation and distribution of warm air throughout the room. Placing them near the ceiling may lead to stratification of air, where the warm air stays near the ceiling and doesn't effectively heat the room.
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.
3 feet