When you’re choosing a commercial garage door for maximum energy efficiency, knowing the difference between U-Factor and U-Value is critical. While they may sound similar, these terms measure insulation in very different ways—and understanding them can mean better performance, lower energy costs, and faster ROI.
U-Value measures the rate of heat transfer at a single point in the door, much like R-Value (its inverse). U-Factor, however, is determined by physical testing of the entire door assembly—curtain, guides, bottom bar, and perimeter seals—providing a much more accurate reflection of real-world performance.
That’s why U-Factor is the gold standard for assessing thermal efficiency. The lower the U-Factor, the slower heat moves through the door, which means better temperature control inside your building year-round.
See How Much You Could Save
We’ve put together a quick, visual info sheet showing how U-Factor impacts performance, along with the potential cost savings by climate zone when you choose a Thermiser Max – Low U Door. In some regions, the payback period is as short as 1.6 years.
Download the U-Factor vs U-Value Info Sheet
U-Value Unequal to U-Factor Info Sheet
