How big a role should energy savings, performance play in the selection process?
That is a tough question. In most cases that is determined by the desired application. Example: a home that is being built on a waterfront lot in Northern Michigan has much different requirements than a home being built in Arizona. In today’s market most quality windows have almost identical energy performance, it more times than not becomes a decision on what type of window to use i.e. casement v/s double hung.