[jpp]

Yup! There’s a neurotransmitter for registering the compounds that trigger that hot sensation, and that neurotransmitter gets depleted over time, based on exposure. I don’t know the exact timeframes, but it’s on the order of days/weeks.

https://en.m.wikipedia.org/wiki/Substance_P

[fy20]

Is it something similar for temperature? In my country some people go swimming all year around - even when the lake is covered in ice (they cut a hole). They say if you go everyday from summer to winter, you don't notice the temperature change and it's not such a big deal.

[jpp]

I’m not aware of anything like Substance P for temperature sensation. If I had to guess, it sounds more physiological— circulatory system adaption to handle colds exposures (e.g. blood vessel diameter). Maybe someone else here knows more and we can both learn!