 This paper reviews the current state of research into adaptive solar control using thermotropic and organic thermochromic materials. These materials can be used in smart windows to reduce heat gain and glare while still allowing natural light to enter. Polymer blends, hydrogels, resins, and thermoplastic films with a reversible temperature dependent switching behavior have been described. Additionally, a comparison between traditional shadow systems and intrinsic solar energy reflection materials based on phase transition components has been made. Finally, extruded films and high thermally stable casting resins with thermotropic properties have been developed, which contribute significantly to this field. This article was authored by Olaf Mulling, Ralph Ruhmann, and Arno Siebeth.