Huper Optik Therm-X 70

About Huper Optik Therm-X 70

Therm-X 70 is the clearest option in Huper Optik's Therm-X Series — a low-emissivity insulating film engineered for year-round thermal performance rather than solar rejection alone. At 70% VLT, Therm-X 70 adds an insulating layer to existing single-pane glass that helps retain heat in winter and reduce solar gain in summer without significantly altering the light levels or exterior appearance of the window.

Philadelphia sits in IECC Climate Zone 4A — a mixed-humid climate with hot summers and cold winters — making it an ideal market for low-E window film. The city's housing stock includes one of the largest concentrations of older single-pane rowhome glass in the Northeast. Therm-X is engineered for this scenario: adding meaningful thermal resistance to existing glass without the cost or disruption of full window replacement.

For Fishtown row houses, South Philly twins, and Mt. Airy craftsman homes with original single-pane wood windows, Therm-X 70 helps address the drafts and heat loss that older glass produces in winter while blocking UV fading and some summer heat gain. At 70% VLT, the film maintains the open, light-filled character of rooms where natural light is a priority — ideal for north-facing rooms or spaces where daylight is limited.

Therm-X 70 carries Huper Optik's lifetime residential warranty.