I'm from Wisconsin and we have a program called Focus on Energy which implements the ENERGY STAR program for improving energy efficiency of older homes. I'm not sure what you have in your region, but ... read more
It also depends on how high off the ground you are. Be aware that (at least in Wisconsin) if you are more than 24" above ground to the floor of the room, you can't use a vinyl product like PGT Eze-Bre ... read more