WHAT DOES THAT STUFF MEAN!
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For our location in the country (South Central) we have both heating and cooling loads. The best design has orienting majority of the windows to the south. With overhangs (or shade trees within 50’) solar gain is reduced in the summer, and provides greater solar gain in the winter. With the windows on our east elevations (the view) , we increased the performance rating. Our Architecture studio has north facing windows, which is the best light for that type of work (less eye strain).
Here are the specs for our typical Slider on our south elevation:
U-Factor .31= This number measures how well heat is transferred by the entire window(the frame, sash, glass) either into or out of the house. The lower the number, the better the window will keep the heat inside on a cold day.
For South Central U-factor of less than .35 is good, at .31 ~we are great!
Solar Heat Gain Coefficient (SHGC).21=The lower a window’s solar heat gain coefficient, the less solar heat is transmitted.
For South Central SHGC of less than .30 is good, at .21( some of our windows are rated .08) ~we are great!
Visible Transmittance .48= This is the amount of visible light transmitted. The higher the number the more light is transmitted. Between .30 &.70 VT is typical for double pan windows.
TMP- Tempered glass, so it breaks into small pieces but it is very strong glass.
LWE 366 – A Low E Glass with the 366 coating. The coating reflects 95% of ultraviolet rays.
One-Lite ARG- The window pane has argon gas between the panes, which helps reduce conduction and consequent energy loss.