Pretty cool, right?

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Once folded, place it in a bucket filled half with water.

How To Cool Your Room in Summer Without Aircon

Image credits: Effective Life Hacks via Youtube

Soak it for two minutes.

After this, put it in the freezer and leave it for one hour.

How To Cool Your Room in Summer Without Aircon

Soaking the curtain in water

Blowing the frozen curtain with fan