A better approach is Passive Annual Heat Storage (PAHS). You store excess summer heat for winter use. Requires a very large mass for this heating/cooling system. I built mine almost 20 yrs ago, works as advertised. No overhangs are necessary, will not overheat in summer. No AC needed here in Virginia.
I've worked on the design of many, currently for southern France, South Carolina, and central Mexico. The annual heat storage is treated like any heating or cooling system, sized according to the house heat loss/gain. But there are no moving parts, no pumps, no motors, nothing to maintain. It just sits there.
Slight variations are needed according to whether it's primarily a heating or cooling climate, and how severe. The first PAHS was in Missoula, Montana where the originator managed an annual indoor temperature swing of only 7º, without his doing anything. They hover near 70º. Doesn't take much to change that, according to your need.
6' of overhead dirt gets rather expensive to support. I've found that our high mass houses can be built for less than conventional stick houses. Usually no need for a furnace or AC. For a mortgage, adding a tiny air source heat pump is the best bet. You don't have to use it, but it makes the appraiser happy. Also functions for dehumidifying in humid climates.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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