EKO_Q22_Windows Version 7.1.1

For each window, confirm that the window types, U-values, SHGCs, areas, orientations, overhangs, shading and wall assignments which are entered into the software correspond with plans and/or field data collected by the Rater/RFI for the actual condition of the rated home. Appendix B states, "Each unique window type and U-value combination shall be calculated separately."

• If the windows are all of the same type, but only vary in size, it is acceptable to group window areas by orientation. However, be sure that these groupings are broken out by shading if not all shaded the same (e.g. some windows on the back of the house are shaded by a porch overhang while some are not).
• Lastly, where some software allows for an automatic rotation of the orientation of a house, the “front” of the house can easily be lost. For this reason, it is best practice to include the word “front” in the label of at least one of the windows on the front of the house.

SCORING:

• Satisfactory: No errors in window modeling
• 1: one to four minor errors (listed below) in window modeling (accumulated errors of all windows [individual or grouped])
• 2: five to ten minor errors (listed below) in window modeling OR one to three major errors in window modeling (accumulated errors of all windows [individual or grouped])
• 3: eleven or more minor errors (listed below) in window modeling OR four or more major errors in window modeling (accumulated errors of all windows [individual or grouped])

Minor Window Modeling Errors:

• U-Value off by 0.02 to 0.04
• SHGC off by 0.02 to 0.04
• Surface Area of each window off by 5% to 10%
• Overhangs greater than 1' not modeled (whether this is for soffits, porchs, decks, etc.) or depth/top/bottom height errors > 1' in these values

Major Window Modeling Errors:

• U-Value off by 0.05 or greater
• SHGC off by 0.05 or greater
• Surface Area of each window off by >10%
• Assigns Window to incorrect orientation
• Assigns Window to incorrect wall