Hello from sunny Southern California...where we either have fires or sun, both capable of transmitting tremendous heat into the inside of a car. Does it make sense to add solar window tinting onto the window to reduce the heat load? What solar film should one choose? I see 3M, but there are others and I cannot figure out which ones are for real and which ones are BS, both brand and type. Advice would be greatly appreciated. and let me add a really stupid question---would one tint the front window, too? and the sunroof?