Question

in a room it is best to place a room heater on the floor but an a.c. near the ceiling. why

Answer 1

Heya!

Before I answer your question, it is important to explain a few concepts.

1. Warm air is lighter and hence, goes upwards.
2. Cool air is denser and hence, goes downwards.

So, coming to your question,

It is the best to keep a room heater on the floor because, since, warm air moves upwards, the whole room will be heated by the room-heater. If we keep a room-heater near the ceiling, the top of the room will be heated and the bottom remains still cool.

Now,

It is best to keep an air conditioner near the ceiling because, the whole room will be cooled by the A.C. If we keep it on the floor, then the bottom of the room will cool and the top will remain hot.

Just, that's the reason.

Enjoy!

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