Please be gentle. I like geothermal but don't know much. I know that below 4', the ground temp is around 55 degrees. What I want to know is what sort of loop it would take to cool a 4" square of aluminum down below the dew point. Around here, I think 65 degrees would be fine. For starters, let's assume that we are dealing with a solar pump that pumps maybe 2 gallons/minute. Is this something I could build into a stake that I can set into the ground with a post hole digger?