Which of the following pairs is correctly matched?

• A. U-value — Overall heat transfer through window components
• B. Fenestration — Structural integrity of the wall
• C. SHGC — Insulation resistance of the wall
• D. U-value — Solar heat gain coefficient

Answer: (A)

U-value represents how much heat moves through a building element, so for a window it describes the overall heat transfer through the entire window assembly, including glazing, frame, and seals. That is exactly what “overall heat transfer through window components” means, making this pairing correct. Fenestration refers to the openings in a wall (windows and doors) and relates to design and performance of those openings rather than structural integrity. SHGC, or Solar Heat Gain Coefficient, measures how much solar energy passes through the glazing, not insulation resistance, which is captured by R-value. So the U-value paired with overall heat transfer through window components is the accurate match.