Re:Coffee Joulies: Kickstarter project keeps your coffee at ...
by georgieporgie on Thursday March 31, 2011 @01:04AM
(#2390470)
but then don't drop it too far down.
They actually actively maintain the temperature until their internal substance has turned back into a solid (which may or may not be what you meant).
What the Joulies do is _cool_ the coffee by initiating a phase change in their PCM, but then don't drop it too far down.