Window film works like a highly engineered “ filter” for your glass. Sunlight coming through a window isn’t just the visible light you see; it also includes infrared (a major source of the heat you feel) and ultraviolet (a major driver of fading and material breakdown). When a film is applied to the inside surface of the glass, it selectively manages that solar energy—letting in usable daylight while rejecting portions of infrared heat, reducing glare, and blocking UV. The result is typically a home that feels more even from room to room, with fewer hot spots near windows, less screen glare, and better protection for floors, furniture, and artwork.