one of the major purposes for humans to construct building like structures is to avoid extreme temperatures of the outdoors and enjoy the much moderated indoor environments. Windows blinds can help a great deal with that as well. When you want to keep the inside temperatures from escaping out, having your windows blinds shut down covering all of the window areas is a great option and variations like the cheap roman blinds, roller blinds or even vertical blinds when installed close to the window glass can do just that. For domestic interior where you have used a lot of wood around the rooms, cheap wooden blinds work great mixing in with the design themes and providing control over daylight maximization as well. Folding them to their topsides, you can enjoy all the natural daylight and having them dropped down, cozy dark rooms can be of use when required as well.