Solar energy reaching your car arrives as visible light, ultraviolet and infrared, and it is the infrared portion you feel as heat without being able to see it. A dyed film works mainly by darkening the glass, which is why a dark window does not always mean a cool cabin. Kepler's nano-ceramic IR and IR+ films use ceramic particles engineered to work across the solar spectrum, which is why a lighter shade in these ranges can still make a real difference to how the interior feels after a few hours in the sun on a Northampton street. That matters for comfort, and it matters for the interior itself, since sunlight is what fades and tires trim over time. Remember that the percentage in a shade name is visible light transmission, not a heat figure, so compare the exact film and shade rather than assuming darker means cooler. A dealer can walk you through the differences and recommend a shade for the windows you want treated.
Did you know we also offer residential and commercial security window films? View our security window film options