But i think something needs to be pumped in a continious circle so if the heat presurizes a gas then you will have a hot gas under presure and it will get cooler when depresurized but will still be hotter the when you started and there is no way to push it back into the chanber for presure. With a heat pump (for cooling) it presurizes a gas then cools that gas off and then depresurizes it to where it comes into the house to cool somthing (absorbing heat from inside your house) then pumped back to the presure chamber all of this is run by an electric pump!
Thanks Justin of http://www.ebikes.ca/
Also a thanks to Methy at http://www.methtek.com/
And Dave who has some good deals on STUF
RC lipo and most other types of Lithium batteries you MUST know your individual cell voltages while charging and discharging.
Batteries of all kinds need respect they can burn your house down, so don't sleep with them under your bed or any other were you cant afford smoke or fire!
[color=#FF0000][b][size=150]Never above 4.2v never below 2.7v EVER!!!