ACs give out cold air, which is heavier than air at room temperature as cold air is more denser. So if the ACs are placed at lower parts of the room then only the lower parts of the room will get cooled and not the upper parts as cold air cannot rise. Therefore they are placed at nearer to the ceiling
Heaters give out hot air which is lighter than air at room temperature as hot air is less denser. So if the heaters are placed near the ceiling the hot air won’t reach the lower parts of the room as the hot air can’t sink. Therefore heaters are placed closer to the floor so as to heat the entire room evenly.
The particles in cold air are heavy and dense. Therefore, they move downwards. To allow equal distribution of cold air, AC’s are placed closer to the ceiling so that these particles move down across the room.
But, hot air is light and tends to rise. So, room heaters are placed closer to the floor so that the air, heats up the lower part of the room along with the higher parts which would not be possible if it was placed at a height.
The cold air given out by ACs is dense. Hence, ACs are placed in the room’s upper part to ensure equal distribution of the cold air across the room. Whereas, heaters give out hot air which is less dense and hence rises up in general so they are placed in the lower parts of the room.
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