What would it take to build a cryogenic cooler?

[Shingoshi]

Changing phase uses the latent heat of vaporization and latent heat of fusion.
Its been a very long time since I have had to remember the definitons of these so here is a Wiki link to get you started. I dont want to tell you the wrong thing.

http://en.wikipedia.org/wiki/Latent_heat

I will keep my sarcasm in check.

Sitting there having to resist the opportunity to bite back. Oh the sheer pain of restraint!

Thanks! It really is appreciated. Especially after our past exchanges.

Shingoshi