Does anyone know anything about Geothermal cooling? I have an idea and I don't know if it will work in Arizona. In most parts of the country, if you dig down 5 feet, the temp is 50 degrees. I don't know if that holds true for Arizona. I do know that they bury the water lines 1 1/2 feet below the surface and during the summer you really don't need a water heater unless you like real hot showers. I live in northwest part of the state at an elevation of 3400 ft. The hottest it will get in the summer is about 110. I have idea for an alternitive to burying the lines in the ground and I'd like to kick it around with someone that is familer with Geothermal.