I think the energy tax credit runs through the end of this year. If you pick a color that is deemed energy efficient (very reflective), then Uncle Sam will reimburse you for materials, up to $500.

http://www.energystar.gov/index.cfm?c=tax_credits.tx_index


"When there was no fowl, we ate crawdad, when there was no crawdad, we ate sand."

"YOU ATE SAND!" - Raising Arizona