Venetian windows with broad timber mullions (triple box sash) or masonry framing are taken care of as a few person windows. Use weatherstripping: With the movable portions of your sash windows, like the place the two sashes fulfill, implement weatherstripping. This can stop draughts from moving into by these joints. https://rylanhawav.blogoxo.com/35734263/5-easy-facts-about-sash-window-draught-proofing-described