This document discusses using 12 Peltier modules connected in series to transfer heat between rooms, either cooling a hot room or warming a cold room, with the potential to increase efficiency through additional effort. While the efficiency may be low, the system can be built for free or used recreationally.

1. 0.3 watt from 20 dollars

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

4. Connect Peltier’s element series
• And let thermodynamics to do the rest.

6. You can increase the efficiency
• Adding some man power…..

9. Is it worth????
• Mmmmmmm…….
• At least it’s for free…….
• ..or you can enjoy playing 