How to make a phase change systems

[vale46]

Hi guys!!
I'm writing from italy and reading this page I start to understand that i want a phase change system.the question is....what are the necessary components to make one of this system??And what do they cost??How I had to build???excuse for my bad english:p

[bowman1964]

here my friend check this out for good details
http://www.phase-change.com/phpBB2/index.php
http://www.phase-change.com