Once we figured out the problem with the Peltier element, another problem came up, this was not a very important problem, but rather an annoying one. What happened was that when the Peltier reached the desired temperature and the arduino software went into "maintain temperature" mode it would send signals to turn the relays on and off really fast, making all four of them make a lot of clicking sounds (the magnetic switches), which was, of course, unpleasant. For this reason we substituted the relay configuration for an H-Bridge one. We are now developing a solution with a L298N H-bridge. Once it is up and properly running, we will update the BOM list, custom PCB design and Arduino sketches.