The National Fenestration Rating Council is the only officially recognized agency that monitors thermal performance of windows, doors and skylights. The NFRC establishes testing methods, monitors test laboratories, provides surveillance of product conformance, and supervises an energy performance rating and labeling program. The values rated and published reflect a whole product performance value, not just a theoretical glass value or other value, which may be inaccurately used to describe a total product value.

GALAXY participates in the NFRC CERTIFICATION PROGRAM, and the values for all units tested and rated are published in that organization's CERTIFIED PRODUCT DIRECTORY. This directory is also displayed on NFRC's web-site, www.nfrc.org.

Every GALAXY® unit style listed in the NFRC DIRECTORY is routinely available, unlike many of the variations tested and rated by other manufacturers.

A word of caution, we recommend that a perspective window buyer check this directory for proven whole window thermal values when selecting a product. Wildly superior sounding R-Value claims often reflect a theoretical or a "center of glass (only)" value, and offer no indication of the real value of the window product. In nautical terms, it doesn't take much of a leak to sink the ship!

Each of the GALAXY® variations shown are rated at the top of their respective variation category.