You don't need to tint with the premium glass. We face south and the reduction in heat transfer in during summer and out in winter is amazing.
Can't help you on the question as to if a window film would void the warranty. Just know that if you get the smart Sun or the smart sun with the heat lock glass visible light transmittance will be less to begin with. Again may want to check with manufacturer directly. There may be a tinted Sun Glass that is used more in southern environments that may be available here.
I beleive so and you have to ask them
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