Energy Efficiency for new house?

Question:Hello All,

I'm Austin, Texas. Planning to purchase a new home. Wondering what best energy efficient features I should asked the builder.

Have you done anything yourself? Economical?
What should I target mainly?
Solar? Ventilation?
Windows are huge in family room with high ceiling. What windows should I go for to protect myself in Texas heat?

One of the builder was saying they added 'Tech Shield radium sheet' to the roof and says it reflects light, and saves electric bill. Are those effective?

Any rebates or incentives goverment offer?

Thanks!

Answers:
Austin is probably the "Green" capitol of the US. Look around the phone book (or call the CofC) and ask for the "Green Council" or something to that effect. They award points to energy efficient builders and offer all kinds of info on what works in Central Texas.