Windowmann, I have been reading all of youre postings and you seem to know what you are talking about. I really need your advice. I am having 34 Certainteed Somertone II windows installed. My installer said I do not have to removed the old aluminum frames to have these windows installed. What is you opinion, should the frames, if they are in good condition, be removed or not. My home is located in Southern California and it is 9 years old with stucco. Any advice you can provide is greatly appreciated. Thank you