0.3 watt from 20 dollars

• You will need approximately 12 Peltier.• Aluminum window profile.• Cold weather , hot room.• Or opposite…..

Connect Peltier’s element series

• And let thermodynamics to do the rest.

You can increase the efficiency

• Adding some man power…..

Is it worth????

• Mmmmmmm…….• At least it’s for free…….• ..or you can enjoy playing