Why is it desirable to install an air conditioner near the ceiling of a room and not close to the floor?

Installing an air conditioner near the ceiling of a room is desirable because hot air rises and tends to accumulate near the ceiling. By placing the air conditioner there, it can more effectively circulate and cool the warm air that has risen. Additionally, cool air is denser than warm air, so it will naturally sink and spread throughout the room once it has been cooled near the ceiling. This positioning also helps to create a more even distribution of cool air throughout the space.