C-17 Glazing Contractor Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

The main feature of energy-efficient glazing is its use of low-emissivity (low-E) coatings and gas fills, which significantly enhance its thermal performance. Low-E coatings are microscopically thin layers applied to the glass to reflect infrared light while allowing visible light to pass through. This helps keep indoor spaces warmer in the winter and cooler in the summer, reducing energy consumption related to heating and cooling.

Gas fills, commonly argon or krypton, are used between glass panes in insulating glass units. These gases have lower thermal conductivity than air, further improving the glazing's insulation properties. Together, these features contribute to better energy efficiency in buildings, which can lead to lower energy bills and a reduced carbon footprint.

The other options do not accurately represent the primary characteristics of energy-efficient glazing. While thickness can play a role in overall insulation, it is not the defining feature of energy efficiency. Additionally, energy-efficient glazing is applicable to both residential and commercial uses, and it does not always require a tint, as clear glass with low-E coatings can also be energy-efficient.