<p>All I know is Mayor Bloomberg is encouraging people with flat roofs to paint them white because it saves a lot on energy costs in NYC. <a href=“http://www.nytimes.com/2009/07/30/science/earth/30degrees.html[/url]”>http://www.nytimes.com/2009/07/30/science/earth/30degrees.html</a> While it’s true theoretically one can put lots of insulation in the attic, in most houses roofs are a big source of heat loss. Windows are bad too though not just because they have very little insulative value, but also because they are frequently poorly installed and may leak wherever there are moving parts.</p>