Is there any info on the exact mechanic of that system? Heating seems straight forward, but what about cooling? How does the tile cool from, say, 30 deg celsius to 5 deg celsius? And how long does that change take? How long can such a low temperature be held? What does the tank use up to maintain such temperature? Does it use some sort of centrally stored gas that helps with vaporization and cooling? And is it a closed system like in the fridge or a not fully closed system, like in an AC, where the gas does need to be replenished from time to time due to various joint' leakage?