ok, we have a really efficient way to make heat (adding energy into a system) all we have to do is pass a current through a high resistance wire, boom, close to %100 heat generation. however, from what I can tell there is no way to create coolness (take energy away from a system) like that. we have: Phase change: (requires a lot of energy, generates a lot of heat that needs to be transferred else where) peltier effect: (requires there to be a temperature differential to already exist) sterling engine: (See peltier effect) and on the fringe we have %230 efficient LED (made in the MIT lab) which uses power + some heat to make light, but still takes power and I think the closest we have is an Optical rectenna which takes visible and infrared wavelengths and turns it into power, however, it only works with RF waves, not particle movement. is there a way to simply absorb particle movements and convert it straight into electricity like some ultra-small piezo generator? where it would generate power from a room simply by sucking the heat out of it & without needing a place to dump any excess heat.