Will I save money if I insulate with Polyurethane foam?

YES. The installed cost of spray foam is about 2-3 times higher than fiberglass batts or blown-in insulation. However the higher initial cost is partially offset because you will save in your heating fuel and electric bills. Studies suggest that homes insulated with spray polyurethane foam use 20% to 40% less energy than homes insulated with conventional insulation.