Somewhat related - pots made out of the earth/clay are very good at keeping the temperature cool. I wish we see more of them being used in western countries.

I remember my family in Myanmar storing water in big pots made out of clay like this one [https://images.app.goo.gl/hG4bDGtn34QhmdxP8]. The water that is stored there is super cold and very refreshing for summer use. People use similar, but smaller pots for storing drinking water in parts of the streets so that anyone can take a sip if they are thirsty: https://images.app.goo.gl/hG4bDGtn34QhmdxP8

I wonder if my country, which is now undergoing a brutal military coup, still makes such pots these days....