What would it take to build a cryogenic cooler?

[Shingoshi]

I Said:

Reading your posts I'm not sure you understand that there is a difference between Temperature (measured in Celsius,Fahrenheit,Kelvin) and Heat (measured in BTU's, watts,kj/kg,calories)

I'm sorry I didn't catch that. Yeah, you're probably right. I need to have a better understanding of the difference so that I won't confuse things.

Let me see if this is correct:
Temperature is what we use to measure how warm something is.
Heat is what the thing we're measuring contains, and what's required to change it's temperature. In other words, you have to remove a given amount of heat to change the temperature of a thing?

Correct me. I'll gladly accept it!
Shingoshi