What is the R-value of a typical single pane wood window?

The R-value of a material measures its resistance to heat transfer, with a higher value indicating better insulating properties. A typical single-pane wood window typically has an R-value around 1.0 to 1.2. Therefore, the answer of R-1 aligns closely with this real-world characteristic, reflecting the minimal insulation that such windows provide.

In the context of window performance, single-pane windows are less effective at limiting heat loss or gain compared to double or triple-pane windows, which have multiple layers of glass and often include gas fills to enhance insulation. The values for R-2.5, R-3, and R-1.5 would imply a degree of insulation that a single-pane window cannot offer, thus making R-1 the most accurate answer in this scenario. Understanding these values is crucial for making informed decisions about window selections in energy-efficient building practices.