Kolbe & Kolbe Millwork Co.s Windquest Energy Performance windows offer energy performance that is twice that of Energy Star criteria, with U-values of 0.18/0.19 and R-values of over R5, along with a solar heat-gain coefficient of 0.23. Available in casement, awning, or studio versions, the windows feature a 1-1/4" triple-glazing system and allow a maximum air infiltration of only 0.01 cubic feet per minute. Design options include grills in the airspace or performance-divided lites in several bar widths in either white or beige (the exterior may also be color coated with a polyurethane color finish). kolbe-kolbe.com

Kolbe & Kolbe Millwork Co.’s Windquest Energy Performance windows offer energy performance that is twice that of Energy Star criteria, with U-values of 0.18/0.19 and R-values of over R5, along with a solar heat-gain coefficient of 0.23. Available in casement, awning, or studio versions, the windows feature a 1-1/4" triple-glazing system and allow a maximum air infiltration of only 0.01 cubic feet per minute. Design options include grills in the airspace or performance-divided lites in several bar widths in either white or beige (the exterior may also be color coated with a polyurethane color finish). kolbe-kolbe.com