No. of Recommendations: 2
Remember that solar hot water has a higher payback than PVs. A few companies are going to PVT designs - these cool the PV, raising efficiency, and the heat extracted goes to DHW or building heat. One new development, where applicable, is storing excess summer heat in the soil under a building. Much escapes, but it allow larger collectors to be economic, and it cuts heating bills, in late fall and early winter.

A variation some of us in the Dakota states are using is fans blowing summer air through the basement into the house, with dehumidifiers. The amount of heat return is low - but that cheap system is paid back through reduced summer cooling bills - very nice ROI. In our case, with a very old house, a nice byproduct is that we don't have trouble with frozen pipes anymore. Note that for the first few years, almost all the return will be in the form of reduced cooling bills - it takes time to warm all those tons of soil by this simple means.
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