Black Haired Girl Posing In The Room With Curtains

Light control and insulation
Curtains can be made from varying thicknesses of fabric, each with a differing degree of light absorption and heat insulating qualities. For maximum temperature control, the curtain gap to the window should be small, with minimum convection drafts below or above the curtain. Various architectural structures around the curtain can minimize these air drafts, but usually they are just used for decoration and make rooms feel more cozy.
A sheer or net curtain is one that is made from translucent fabric, such as a loosely woven polyester voile or a cotton lace. Sheer curtains allow a majority of light to be transmitted through the fabric, with the fabric weave providing a basic level of UV protection while retaining maximum visibility through the curtain. Sheer curtains are sometimes referred to as privacy curtains in reference to their screening abilities; during the day most sheer fabrics will allow people inside the home to see the outside view whilst preventing people outside the home from seeing directly into the home. Due to the loose weave in sheer fabrics, these types of curtains offer very little in the way of heat insulation.