Although others that have responded to this thread have far more experience, I believe Peltiers are optimized to work in one direction. That is to say there is

Although others that have responded to this thread have far more experience, I believe Peltiers are optimized to work in one direction. That is to say there is a hot and cold side, so I'm not sure it is as simple as adding an inverter. Not that you'd likely be using your hands as a heat sync anyway. Yes, I realize this was meant as a joke, but I'm still curious if current can be reversed by just changing the gradient. Does it still work but maybe it is less efficient? Is there no difference at all?