Thanks to everyone who has recently posted on this topic. As others have pointed out, there is no simple cure for this problem. According to window manufacturers, vinyl is an inappropriate siding material because of its low melting point. According to the vinyl siding manufacturers, the windows creating the reflections are defective because they cause concentrated areas of high-temperatures. Under our legal system, liability is being determined by the courts. Anyone who wants to communicate with me on this issue is welcome to e-mail me: Martin Holladay, editor Energy Design Update holladay@sover.net