3M Exterior Prestige 20 - PRX 20

About Exterior Prestige 20 - PRX 20

This spectrally selective window film rejects solar heat while preserving desirable daylight transmission. With visible light transmission of 21%, it strikes a specific balance between clarity and thermal performance. The Exterior Prestige 20 - PRX 20 uses non-metallized, multi-layer optical technology to achieve heat rejection without interfering with wireless signals.

Philadelphia's Zone 4A climate brings humid summers where solar gain through untreated glass can overwhelm HVAC systems. Buildings in dense neighborhoods like Chestnut Hill and Society Hill benefit from reduced cooling loads, while winter heating efficiency improves as the film helps retain interior warmth. The film is particularly effective on south- and west-facing facades that receive extended sun exposure.

The non-metalized construction means no signal interference with cell phones, Wi-Fi, or building automation systems. Heat rejection of up to 79% reduces the workload on HVAC equipment, extending system life and lowering energy costs. The film's low reflectivity maintains exterior aesthetics and interior views, important for Philadelphia's historic districts where building appearance is regulated.

Compared to traditional reflective films, this product offers superior heat rejection with significantly better light transmission and no mirror-like appearance. Philadelphia property owners who want energy savings without altering their building's character find this an ideal solution. It outperforms standard tinted films in both thermal performance and visual quality.