How much heat does window film block?

Depending on the product, XPEL Vision solar films reject from about 35% to nearly 90% of total solar energy, according to the manufacturer's spec sheet.

The number to look at is total solar energy rejected (TSER). The clearest films sit at the low end of the range and the darkest or most reflective at the high end. These values are measured by the manufacturer on 3 mm single glass; real results depend on your glass. We choose based on the balance you want between light and comfort.