This method is especially effective for single-pane or older windows.' 3. Hang thermal curtains or insulated drapes Adding thermal curtains or insulated drapes is a great curtain hack for a warmer ...
Just attach them to your existing curtains, and you're all set.' For this, Kaspar recommends the Warm Window Insulated Fabric available at The Warm Company, as 'it can keep up to 95% of heat from ...