Typically, windows have an R-value ________ the wall.

Question

BlackTom AI · Accepted Answer

In order to evaluate how the R-value of windows compares to the wall, we should consider what the R-value measures and typical construction practices.
Option 1: 'Lower than' — This is the common situation. Windows are poor insulators relative to insulated wall assemblies, because glazing and frame materials conduct heat more readily than insulated wall cavities. This leads to a smaller R-value for windows compared to the wall, meaning higher heat transfer. 
Option 2: 'Higher than' — This would imply that windows provide better insulation than the wall, which contradicts standard building science reasons. Glazed units and frames typically have more thermal bridging and lower insulating performance, so windows are not higher in R-value than walls.
Option 3: 'Equal to that of' — Equal performance would be unusual in typical construction, since walls are designed with insulation (e.g., dense-packed or batt insulation) to achieve a higher R-value, while windows are not optimized to match that level. Equality would be atypical and not aligned with common practice.
To summarize, the prevailing understanding is that windows generally have a lower R-value than the wall because they involve glazing and framing that conduct heat more readily, reducing overall insulating effectiveness compared with an insulated wall cavity.

EGEE 102 (SP25): Energy Conservation for Environmental Protection FINAL EXAM

Typically, windows have an R-value ________ the wall.

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