Heating and cooling systems usually have vents that blow out warm or cold air near or on the ceiling.?

Question

The air return to the system is usually located on or near the floor. Why do you think this is the most efficient method for temperature control?
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Answer 1

Well, this makes a very bad assumption, that the vents are on the ceiling and the return is on the floor. In fact, to make building less expensive, you are more likely to find the vents on the ceiling of the first floor and the floor of the second, because a single conduit can be used. The return is always on the other side (top or bottom) of the room though.

Imagine that you have a vent on the floor and a return on the floor. The air would go out the vent and back in the return and never mix with the air near the ceiling. If we were air conditioning, since heat rises, this air would be very hot.

Putting the vent at the ceiling and the return near the floor (or vice versa) gets air circulating. Having a ceiling fan helps, too.

Of course, this is always going to be circulation issues. If you are heating the house, hot air blown in at the ceiling is not going to mix the room air as effectively as if you blow it in at the floor. But if you put the vent on the floor, you get the same issue when you are air conditioning. An ideal house would have pairs of vents and returns, and would blow heat in at the top and blow cool air at the bottom depending on which system was running. Of course, that would be twice as expensive to lay the ductwork.