Scientists Develop Efficient Roof Coating That Can Switch Roles From Season to Season:
Roofing material made from waste cooking oil can supposedly reflect sun in summer and absorb heat in winter... of course the article doesn't mention how...
http://www.ecohomemagazine.com/finishes-and-surfaces/scientists-develop-efficient-roof-coating-that-can-switch-roles-from-season-to-season.aspx
A Roof That Changes Color?
These tiles are white in summer for high reflectance and turn black in winter to absorb heat. This one is more believable... but quite pricey no doubt.
http://www.ecohomemagazine.com/news/2009/10/a-roof-that-changes-color.aspx
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