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The screen in place would have some micro effect of blocking direct sunlight and warming the window that would be measured only by a Physics professor. Having the screen off a window that receives direct sunlight will actually raise the temperature of the glass by some absurd fraction of a degree. You'll affect the house temp more when you open the door to go out and pickup the newspaper.
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Joe
See Porsche run. Run, Porsche, Run: `87 911 Carrera
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