Curtains or drapes backed with insulated lining provide the best protection from sunlight, heat and cold. The lining even muffles noise.
Blackout lining, used in bedrooms to block out sunlight, also protects from heat, cold and UV rays. This lining can be sewn onto the back of the drapes or curtains.
Insulated interlining, a blanket-like layer of material between the lining and curtain fabric, further reduces cold penetration and sun glare.
Wool or Velvet Drapes
Heavy draperies made of wool or velvet are also good options for blocking sun and heat. Hard-wearing wool hangs in full, loose folds, blocking both heat and cold with its substantial heft.
Likewise, plush velvet blocks both drafts and light. Velvet and wool are expensive options for drapes but are usually considered an investment because of their durability.
In an outdoor room, sunroom or screened porch, natural light is appealing but often needs to be blocked during the brightest part of the day. In these situations, full-length panels made of canvas or other outdoor fabrics can be utilized.
The panels are pulled to protect from the sun's rays during the hottest part of the day and then opened again in the evening as the sun sets. Outdoor acrylic fabrics, such as Sunbrella, are water- and mildew-resistant and provide sun protection.