Windshield film is a common question, because the windshield is a large area of glass contributing to cabin heat. Rules for windshields are set separately from those for side and rear windows and are worth checking before anything is agreed, since a shade that suits a side window may not be permitted on the front glass. It is also a case where the lighter shades in the range, such as Photon, come into the conversation, as visible light transmission and solar performance are measured separately. Check the current tint laws first, then compare the film data with your installer.