Welcome to the Wausau Product Selection Tool. Here you can compare performance data between a set of Wausau products and get performance information on annual energy, peak demand, carbon emissions, daylight, glare, and condensation predictions. Today's energy-efficient windows can dramatically lower the heating and cooling costs associated with windows while increasing occupant comfort and minimizing window surface condensation issues. Choosing the most efficient window design for a commercial building can be difficult. Product information typically offers window properties: U-factors or R-values, Solar Heat Gain Coefficients or Shading Coefficients, and air leakage rates. However, the relative importance of these properties depends on site- and building-specific conditions. Furthermore, these properties are based on static evaluation conditions that are very different from the real window design situation.

This tool was developed by John Carmody and Kerry Haglund, both former researchers at the Center for Sustainable Building Research at the University of Minnesota. All simulations were done using COMFEN developed by the staff at the Windows and Daylighting Group at Lawrence Berkeley National Laboratory. The effect of excessive air infiltration through existing operable windows is added to COMFEN-calculated energy savings for each replacement window comparison base case.