Hi
@Ericmclemore555 and
Hey, you have them; you may as well use them. Nothing "purtier" than a glass greenhouse and it will provide a longer service life than any other form of greenhouse glazing. One thing you need to be careful of, though, is if you use them for greenhouse glazing your plants will be more prone to "burn". You'll definitely need to use shade cloth during the hot and sunny times.