I live in a 1922 bungalow which has three stained glass windows and four piano windows. During our MN winters, all seven were drafty and cold (especially the leading on the stained glass). Last year I had Indows installed on all seven. I am so pleased: no more drafts, no more cold and they blend perfectly with the original dark woodwork around the panes. I had the company do the measuring and installing which spared me much aggravation. Highly recommended.