Which statement is true about a high U-value?

Which statement is true about a high U-value?

• A. It indicates greater heat transfer through window components
• B. It indicates better insulating performance
• C. It indicates lower solar gain
• D. It indicates higher air tightness

Answer: (A)

U-value measures how quickly heat moves through a material. A high U-value means more heat transfers per square meter for each degree of temperature difference, so window components with a high U-value lose or gain heat more readily. That makes the statement true. If you’re thinking about insulation quality, a lower U-value indicates better insulating performance, not a higher one. Solar gain is about how much solar energy passes through a window (governed by SHGC), so a high U-value doesn’t imply lower solar gain. Air tightness relates to leaks and gaps, not the rate of heat transfer through the material, so it isn’t described by the U-value either.

U-value measures how quickly heat moves through a material. A high U-value means more heat transfers per square meter for each degree of temperature difference, so window components with a high U-value lose or gain heat more readily. That makes the statement true. If you’re thinking about insulation quality, a lower U-value indicates better insulating performance, not a higher one. Solar gain is about how much solar energy passes through a window (governed by SHGC), so a high U-value doesn’t imply lower solar gain. Air tightness relates to leaks and gaps, not the rate of heat transfer through the material, so it isn’t described by the U-value either.