http://www.ebay.com/itm/Vortex-Cold-Hot-Air-Gun-Cold-Air-Dry-Cooling-Gun-Flexible-Tube-130mm-450Btu-hr-/272567362433?rmvSB=true

The air compressor from one KW sends the compressed air to 6 bar at the Hylsch pipe producing cold air on the other side, on the other hot air;

The difference in temperature drives 50 Peltier cells that produce about 3 KW of DC power, part of which supplies the compressor, while the rest feeds the home.

In winter we use hot air to heat up, in summer we use cold air to refresh ...

http://www.ebay.com/itm/2PCS-TEC1-12706-Heatsink-Thermoelectric-Cooler-Cooling-Peltier-Plate-Module/221919454061?rmvSB=true