Hi Tom :) I would say that if you have the option, a vented polycarbonate window would be the best way to go. Here are links with the pros and cons of the various types of greenhouse windows you can choose from (again, IF you have the option of choice.):
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http://www.wisegeek.com/how-do-i-choose-the-best-greenhouse-windows.htm#didyouknowout
Hi Tom :) I would say that if you have the option, a vented polycarbonate window would be the best way to go. Here are links with the pros and cons of the various types of greenhouse windows you can choose from (again, IF you have the option of choice.):
http://www.wisegeek.com/how-do-i-choose-the-best-greenhouse-windows.htm
http://homeguides.sfgate.com/greenhouse-windows-made-of-50339.html
http://www.greenhousecatalog.com/greenhouse-covering
Thanks for using HOMETALK for answers. Good Luck :)
Old glass!! New glass lessens the sun and heat from coming in.