Question

give reason:
a heater is placed closer to the floor and air cooler is placed close to the ceiling.

Answer 1

because hot air is lighter and is at top so we need to heat the cold air whereas air cooler cools the hot air at the top

Thank you

Answer 2

as you know hot air Rises up and cold air settles down so room heater is place near to the floor so that the heat can move uniformly from down to up. similarly air conditioner is placed near silly so that it can cool both the up side of the room and the cold air can go down side so that there is uniform cooling