SHGC (Solar Heat Gain Coefficient)

The Solar Heat Gain Coefficient (SHGC) measures how much solar energy passes through a window and enters a building as heat. It ranges from 0 to 1, where a lower SHGC means less heat transfer, helping keep indoor spaces cooler, especially in hot climates. Conversely, a higher SHGC allows more solar heat inside, which can be beneficial in colder climates to reduce heating costs. SHGC considers both direct sunlight and transmitted heat, making it a key factor in choosing windows for energy efficiency and comfort.