Energy Cost savings
I live in Southern California and we are looking at replacement windows - either aluminum or fiberglass. Obviously the fiberglass would be much more energy efficient but I was wondering how to calculate the cost savings based on the numbers. For example - Milgard Ultra with a U-factor of .35 and a SHGC of .27 vs. the aluminum with a U-factor of .56 and a SHGC of .29. What kind of savings would I be looking at - especially since I am somewhat close to the coast and don't often have to run the a/c or heat. Thanks!