Insulating single pane windows involves applying weather stripping and caulking around the edges to seal gaps. Installing window film adds an extra layer of insulation, while thermal curtains can block drafts and reduce heat loss. These simple steps improve energy efficiency without replacing the windows.

Single pane windows can be insulated with weather stripping, caulking, and window film. Thermal curtains further enhance insulation, helping reduce heat loss and improve home comfort during cold months, making these solutions cost-effective alternatives to window replacement.