Solar heat reaching your glass arrives as visible light, ultraviolet and infrared energy, and infrared is the part you feel but cannot see. Kepler's nano-ceramic films are built to work across that spectrum, with the ceramic layer aimed at infrared, so heat is managed at the window instead of being left for the air conditioning to deal with afterwards. Because the work is done by the ceramic technology rather than by darkness alone, you do not have to choose a heavy shade to get the benefit. In practice that means a cabin that is more comfortable to sit in, less glare on bright days, and interior surfaces that spend less time under direct sun. Compare the published figures for the exact film and shade you are considering, and ask your installer which combination suits your model.