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A friend had a Peltier cooler on a late 90s/early 2000s CPU and had the condensation problem. The cooler (or maybe CPU, or both; I can't remember which) had an algae-like growth all over it.

For this we calculate the dew point with 2 sensors and react accordingly in my temperature controller.

I'd really like to try out these better peltiers, our current ones suck. And the fans to remove the heat are huge and loud.

There are other ways of building refrigerant-free refrigerators too

https://en.wikipedia.org/wiki/Magnetocaloric_effect

and

https://en.wikipedia.org/wiki/Elastocaloric_materials

of course they also have the dew point problem, but so do ordinary refrigerators and freezers.

I need active CPU and light cooling. Fridges are easy.

Anybody who points to dew point issues would be fascinated by

https://youtu.be/qAZ-q3KmDHM