What is the R-value of a double pane window with a 1/2" air space?

The R-value of a double-pane window with a 1/2" air space is an important measure of its thermal resistance, indicating how well the window insulates against heat transfer. The R-value represents the effectiveness of the window in reducing heat loss in winter and heat gain in summer.

For a standard double-pane window, the air space between the two panes is a key factor that enhances insulation by reducing heat conduction. In this case, a 1/2" air space is effective, as still air has a relatively high insulating property. When considering the thermal performance of typical double-glazed windows with this air space, an R-value of around 2.00 is typical.

This R-value indicates that the window provides moderate thermal resistance, which is suitable for many climates, especially in areas where some level of insulation is necessary to reduce energy costs related to heating and cooling. Thus, the R-value stated aligns well with standard thermal performance expectations of windows with double glazing and a 1/2" air gap, affirming that the correct choice is indeed accurate.