I have slept with one of those cheap chinese water bed chilling pads for years until it broke last week.
It is too easy to add new things and never remove anything when #biohacking even if they aren't helping you any more, so I decided to try without it. One night without it I decided it really does improve my sleep enough to be worth it.
Sleeping like shit all week waiting for my new bedjet to arrive to replace it. I hope I haven't made a mistake switching to an air based system instead of a water filled pad.