Yes, I too am wondering how energy efficient the glass garage doors are.

What are the prices of the glass garage doors and where can you buy them?

I just saw this question and have some experience installing these doors in homes I've built. I am yet to find a manufacturer that makes one that is energy efficient enough to pass the local building code requirements here in Arizona. This hasn't stopped me from using them, as I love the functionality and style. I have just been forced to be 'creative' about when I install them. If anyone finds a company that manufactures these with a high energy efficiency rating, please let us know!!!

You can find insulated glass doors, you just have to make sure they are energy efficient before purchasing. Doors like these http://www.glassgaragedoors.com/insulated-glass-garage-doors/ are laboratory tested for air infiltration, water infiltration, and U-values, then given a testing result that meets the local code.

we went with Avant brand