[amideutch]

Getting into this a little late but like the idea of the 'Stretch Wrap'. Don't have to worry about securing it as it does that automatically and is easy to remove when the temps stabilize. Solution heating is not new and has wide spread use in hydroponics, especially in NFT where they heat the nutrient solution. It has shown to greatly enhance plant growth especially in cooler weather and allowed greenhouse growers to lower their thermostats.

But with the earthtainer I would only use heating under two conditions. You use an auto top off valve as Ray does on his so as to keep the water level constant in the reservoir and use a sterile growing medium void of bacteria/fungi. Reason being you don't know what type of bacteria/fungi you have in the normal aggregate and heating it can cause the bad guys to proliferate as well as the good which can cause disease problems.

Ami