Blackout curtains have the room-darkening features built into the fabric, which makes for a thicker fabric. However, they’re still lighter in weight and appearance than drapes, which are more than one layer of fabric.Click to see full answer. Keeping this in view, do blackout curtains really work?Blackout curtains and shades will reduce the amount of heat which is transferred via your windows by as much as 24 percent, keeping the rooms where they’re installed cooler in summer and warmer in winter. This will allow you to use your heating and cooling system more efficiently and save energy.One may also ask, which are the best blackout curtains? So here is my list of The 10 Best Blackout Curtains. Flamingo Blackout Curtains. AmazonBasics Blackout Curtains. AMAZLINEN Blackout Curtains. Utopia Bedding Blackout Curtains. NICETOWN Blackout Curtains. Deconovo Blackout Curtains. Best Home Blackout Curtains. Miuco Blackout Curtains. Similarly, you may ask, what is the difference between room darkening and blackout curtains? Here’s the difference in a nutshell: Blackout shades use a fabric that blocks 100% of all incoming light, while “room darkening” usually refers to almost any shade that uses a fabric that blocks between 95% and 99% of the light that enters your room.Are thermal curtains blackout?Blackout curtains typically feature tightly woven fabric to block out unwanted sunlight. Thermal curtains can also dampen sound, block out sunlight, and reduce energy bills. While both blackout and thermal curtains have insulating and blackout qualities, the primary function of thermal curtains is to insulate the room.