There is no need to replace existing skylights to install Crown Electrokinetics’ DynamicTint Skylight Inserts. Inserts snap into existing frames—without fasteners or tools. Users can then control the level of tint to manage the amount of light and heat entering a room through the skylight. The company says the inserts can transition from clear to true black in seconds, can lower cooling costs, and can be configured to use either solar power or battery to power the tinting. Pricing starts at $400.