Half a croissant, on a plate, with a sign in front of it saying '50c'
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Car roof reflector

 A reflector attached to the roof of a car reflects much of the heat away
 
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Much of the heat cars gain in the summer comes through the roof. An insulated reflector attached with magnets (or even glue) to the roof of a car reflects most of the heat away, and the insulation reduces the heat conducted through the roof.
—macrumpton, May 31 2004

In the same vein http://www.halfbakery.com/idea/Carbrella
[DrCurry, Oct 04 2004, last modified Oct 05 2004]

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       I'd bet more heat comes in through the windows than the roof.
—phoenix, May 31 2004
   

       Actually I just got my car painted yellow, after having it black for 2 years and the temp difference is very noticeable. But I also have tinted windows, but so would anyone who lives in the south and does not want a 150° car in the summer.   

       Unlike the carbrella, my device would stay on the car even while being driven.
—macrumpton, May 31 2004
   

       ups trucks employ such a panel, it's painted white. (+)
—xclamp, Jun 01 2004
   

       Hmm... "Carberella". Now there's a pun just waiting to happen.
—lostdog, Jun 01 2004
   


 

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