Solar energy reaching your car includes visible light, ultraviolet and infrared, and infrared is the invisible part many drivers feel most on a hot day. Kepler's nano-ceramic IR and IR+ films are designed to address solar heat at the glass rather than simply darkening it, which is why visible light transmission and heat performance are quoted separately. A cooler cabin also means less demand on the climate system. For figures, compare the published data for the exact film and shade you are considering, and ask your installer which product they would recommend for the glazing on your Tesla.