The key environmental benefit associated with the use of fiberglass windows and doors is their enhanced energy performance. In appropriately insulated wall assemblies, energy efficient glazing can make a significant contribution to reducing energy consumption in buildings. Energy used to heat and cool buildings is a major contributor to green house gas emissions in North America.

Fiberglass frames are also lightweight and have low embodied energy, compared to many commonly used window frame materials. They are made of non-toxic materials, safe to handle and eventually dispose of.