The windshield is a large source of heat gain in a Tesla, so owners often ask about it. Windshield film is treated separately from the rest of the glass under tint law, and the rules differ from those for side and rear windows, so check what applies before deciding. Where a very light film is appropriate, the IR+ range is the usual starting point, because its heat performance comes from the ceramic layers rather than from a dark shade. Your installer can confirm what suits your model and the current rules.
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