[jeff5may]

I also remember you were trying to figure out how to purify the well to water your garden. This would be the perfect opportunity to kill lots of birds with one creative stone. The following may sound radical and strange, because it is:

Use the water in the well as insulation.

If run on the outside of the envelope, it will literally shield your massive walls from extreme heat gain or loss.

During the summer months, you should have enough solar exposure to distill a good amount of water.

Now please don't shoot me! This method is and has been used in agriculture for decades. Two paper thin sheets of plastic, pumped up with foamed soapy water between them, will insulate a quonset greenhouse well enough to prevent frost damage to plants inside. The storage tank for the water is buried underground and gains enough heat to prevent freezing. It works well enough to make gas heating economical.

The practice of spraying water directly on a roof in summer to provide cooling has been done to death successfully. In your case, it will also paint your roof for you.

To accomplish your goal, something radical and "weird" will have to happen unless you are filthy rich. If you are merely "wealthy", something strange will come about and you will spend a boatload to keep it from being "abnormal".