Sunlight reaching your car's glass includes visible light, ultraviolet and infrared energy, and infrared is the part most people feel as heat in a parked cabin. Kepler's nano-ceramic films are engineered to address solar energy across that spectrum, so the interior stays more comfortable and the climate system has less work to do. Because performance is a property of the film rather than its darkness, a lighter shade is not automatically a weaker choice; compare the published specification for the exact film and shade you are considering. Your installer can walk you through the differences between the IR and IR+ ranges and recommend an option that suits your Tesla and Palm Springs summers.