Curtains can reduce heat loss in the winter by 10% – 25% and reduce drafts significantly. So considering their relatively low cost, and other benefits, are a very good investment. They do this by providing a barrier between the window, and the main room. In general windows have the poorest U-Values in an average room, and so are the focus of most heat loss during colder times. Warm air circulates around the space due to convection and is suddenly cooled when it touches the relatively cold windows. Curtains act as a barrier to this air flow, and so reduce the amount of air being cooled.
Here are some tips to help you save energy with your curtains:
- Actually use the your curtains when you have them available
- The more completely the curtains cover the window the better, so have large ones with plenty of overlap and overhang at the ends
- Lining in curtains reduce air infiltration through them, and so is well worth the investment
- Curtains should be hung as close to the window as possible to reduce air leaking in from the side.
- The longer the curtains the better.
- Install a cornice at the top of a curtain
- Use Velco to attach the ends of the curtains to the walls and to each other in the centre
- Blinds do little to reduce heat loss in the winter