Why A.c. are put on the roof not on the floor?

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Solution

Its not advisable to have cooling on floor , as there are some challenges in having cooling through floor ..

Cold air is denser than hot air and tends to settle at bottom which can increase the temp of the flooring, cold floors are not preferred for human comfort , if cooling is from height it won't cool the floor as it gains heat when and becomes lighter

Colling at height allow air to pass but a floor cooling has restrictions due to the items places on the floor , in this case it puts a pressure on airflow that can be generated by fan/blower

Having cooling on floors can be a expensive solution as you are paying floor space / carpet area etc ..

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