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American Exteriors LLC : U-Factor Ratings

U-Value Rating is the measure of the rate of non-solar heat loss or gain through a material or assembly. U-values gauge how well a material allows heat to pass through. U-value ratings generally fall between 0.20 and 1.20. The lower the U-value, the greater a product's resistance to heat flow and the better its insulating value.

Listed below is a sample of how an energy efficient window compares to a window without the argon gas or Sunclean feature.


Sample #   Configuration   U-Factor   SHGC   VT
1   Clear/Clear No Argon   0.48   0.63   0.67
2   Clear/Clear w/ Argon   0.46   0.63   0.67
       
3   SB60/Clear No Argon   0.33   0.33   0.6
4   SB60/Clear w/ Argon   0.29   0.32   0.6
       
5   SB70/Clear No Argon   0.33   0.23   0.53
6   SB70/Clear w/ Argon   0.29   0.23   0.53
       
7   SB70/SunClean No Argon
Lo-E Surface 3		   0.33   0.28   0.47
8   SB70/SunClean w/ Argon
Lo-E Surface 3		   0.33   0.28   0.47

Notes
Samples: 1 vs 2, 3 vs.4, 5 vs. 6 and 7 vs.8 shows that replacing air with argon improves U-factor by only 0.04, and does not change Solar Heat Gain Coefficient nor Visible Transmitance.

Going from Clear/Clear to Clear Lo-E makes a significant difference in U-factor and SHGC. SB60 vs. SB70 makes no difference in U-factor, only in SHGC. (Sample 2 vs. 4,6 & 8.)

Putting the Lo-E on surface 3 vs. normal surface 2 (as in use of Sunclean) makes no difference in U-value, only in SHGC. (Surface 2 = 0.23 and surface 3 = 0.28)