We used Canton Construction to replace our aluminum frame windows early this year. We found them based on a recommendation by someone else on this website. They did an excellent job and we were very pleased. Highly recommended. Mark Canton’s number is (209) 795-4506. We installed Milgard vinyl windows–reasonable cost, look great (we chose tan color which works well with the cabin–much better than white), and the difference in heat retention in the cabin during the winter was incredible. Replacing aluminum frame windows is a project you won’t regret.