Here is a good website to reference for foam insulation:
http://energy.gov/energysaver/types-insulation
Types of Liquid Foam Insulation
Today, most foam materials use foaming agents that don't use ... read more
You might want to have a energy assessment done through a program such as Home Performance with ENERGY STAR or a utility-specific program in your area. WIndows often cost a LOT (for a quality product) ... read more