Review on 🌡️ GeeBat 10PCS TEC1-12706 Thermoelectric Cooler Heat Sink: Efficient Peltier Cooling Solution at 12V 5.8A by Charlie Dillon

These chips operate at a maximum voltage of 15 volts and sometimes up to 5 volts. Based on my testing, 10V is the best power supply, but all ICs have either died or become inefficient* since purchase. Right now I'm getting about 64F in a 70F room and a hot water loop at 74 degrees Fahrenheit. In a real world scenario this wouldn't be very useful as the outside temperature is typically between 80 and 100°F depending on where you are and obviously using your building's HVAC to cool a room down to 70°C is not a realistic setting and only most of the refrigeration redirects to your air conditioner. I would argue that ICs with a reasonable lifespan and a maximum voltage of 12 volts would be efficient, but at a maximum of 15 volts they generate too much heat to be viable for such a low cooling rating. The best thing you can do, in my opinion, is to buy a smaller package of chips from another supplier. I bought a set of two chips with a maximum voltage of 12 volts, and by running them at 12 volts (give or take) I got amazing cooling potential. TL-DR: 15 volts max generates too much heat to be viable. The ideal voltage is between 9 and 10 volts. Good for heating, not so good for cooling. A minimum of 5 volts means you can save the USB cable and turn on (again, more for heating, not cooling).