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Keeping with years of European practice in energy conservation, KÖNNEN windows offer superior NFRC performance ratings. The European construction style of our frame and sash, combined with our advanced multi-point hardware, rank KÖNNEN as a top performer in the U.S. Our glazing comes from renowned industry leader Cardinal Glass Industries and offers the best LowE coatings available.
Standard options are LowE2 and LowE3, which screen solar heat gain during the summer and reduce heat loss in winter, while protecting against fading UV rays and maintaining high visibility. Additional glazing options are available to meet any specific needs for energy or sound efficiency. |
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PRODUCT |
U-Factor |
SHGC |
VT |
| Cardinal 366, clear lite |
0.29 |
0.26 |
0.43 |
| Cardinal 366, simulated divided lite |
0.29 |
0.23 |
0.38 |
| Cardinal 366, clear lite, argon |
0.26 |
0.26 |
0.43 |
| Cardinal 366, simulated divided lite, argon |
0.26 |
0.24 |
0.38 |
| Cardinal 272, clear lite |
0.30 |
0.33 |
0.47 |
| Cardinal 272, simulated divided lite |
0.30 |
0.29 |
0.42 |
| Cardinal 272, clear lite, argon |
0.27 |
0.33 |
0.47 |
| Cardinal 272, simulated divided lite, argon |
0.27 |
0.29 |
0.42 |
| Cardinal 366, true divided lite |
0.34 |
0.21 |
0.33 |
| Cardinal 366, true divided lite, argon |
0.31 |
0.21 |
0.33 |
| Cardinal 272, true divided lite |
0.34 |
0.26 |
0.37 |
| Cardinal 272, true divided lite, argon |
0.32 |
0.26 |
0.37 |
| *Ratings are based on standard tilt & turn product. |
| U-factor |
Measures how well a product prevents heat from escaping. The lower the U-Factor, the greater a window’s resistance to heat flow and the better its insulating value. |
Solar Heat Gain
Coefficient (SHGC) |
Measures how well a product blocks heat caused by sunlight. SHGC is the fraction of incident solar radiation admitted through a window, both directly transmitted, and absorbed and subsequently released inward. The lower the SHGC, the less solar heat transmitted. |
Visible
Transmittance (VT) |
Measures how much visible light comes through a product. The higher the VT, the more light is transmitted. |
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