When I installed security film on the large patio doors, I didn’t expect much beyond some extra strength, but the difference became obvious during windy days. The glass used to shake and buzz slightly, and that stopped almost immediately. I also felt more at ease knowing that accidental bumps from kids or pets wouldn’t turn into a mess of shattered glass. Energy-wise, I didn’t see a dramatic change, but the room definitely felt calmer and more controlled. While choosing the type, the explanations under Window film options helped me figure out which thickness level actually matters for day-to-day use. For me, the biggest improvement wasn’t measurable numbers — it was the steady sense of security and the quieter feel of the space.