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Up, do the fact that warm air rises and cold air will fall. So, force the colder air up and it will cool the whole area.
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Trinity Alex:
Actually, it depends on a lot of things... like how big is the room, ceiling height, air conditioner cooling power... room sealing...
If the cool air is blown upwards, yes, you will cool the room pretty uniformly - but you will not "feel" the cool the air as fast as if the cool air was blown downwards - (simply because we occupy the space from the floor up, and not from the ceiling down) - scientific explanation: the cold air from the AC reaches the ceiling, now it will cool the very hot air that resides there, only after a considerable amount of time will the ceiling air be cool enough that it will actually drop down [and it will drop down gradually, firstly cooling for example the first feet from the ceiling, then the next, and so on]. Also if you blow the cool air downward, you can leave the hot air that resides towards the ceiling undisturbed because there is no reason to cool the air from the ceiling; if cool air is blown downwards, you will be able to cool a larger area.
I also have a mobile AC unit, that has adjustable vents - after a lot of calculations (but mostly -personal- empirical data) - I have concluded that its best to cool the air at which your head is (this is always true, no matter the ceiling height, room space, room sealing or the air conditioner's cooling power).
* because of my mobile AC's hot air duct, I can't close my window properly - and I can tell you 100% that it's a bad idea to set the vents to blow the air upwards. (and no, I will not cut a hole through the glass, it's not my house).
Trinity Alex
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∙ 11y ago
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Where in a room should vents be placed for central air conditioning?
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Why does your 2004 Honda civic blow hot air out the top vents but does not blow any out to the floor?
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