I have windows that are about 15 years old. They're not bad. Double-pane. I have insect screens on the outside but no storm windows. I feel that taking the window apart and insulating with spray foam would be probably THE best option but I'm not sure how cost-effective that would be. Plus I worry that I may damage my wood trim on the inside. Would installing storm windows help add some insulation? I feel a little bit of a draft coming from the windows but I don't know if it's bad. Anyone ... Anyone? Bueller?