How Much Can I Save on My Energy Bill by Replacing My Old Windows? Old windows can have a significantly negative impact on your energy bills. Outdated single-pane windows have poor thermal performance, and worn window frames may sag or create gaps that lead to drafts. Replacing these windows with modern, double-pane or triple-pane windows can improve energy efficiency and . . .The post How Much Can I Save on My Energy Bills by Replacing Old Windows? appeared first on Sunrise Windows & Doors.