Hanging a wet towel in front of a fan or window offers a simple, science-based cooling method. Evaporation draws heat from the air, providing a slight temperature reduction. This trick works best in dry climates, with efficiency diminishing in humid conditions. While not a replacement for an AC, it can offer minor relief when used strategically.source https://timesofindia.indiatimes.com/life-style/spotlight/wet-towels-over-windows-a-clever-hack-to-beat-the-heat/articleshow/130133010.cms