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Glass Performance Chart

Code Description U-Value R-Value Solar Heat Gain Visible Light Transmittance
Clear Dual Dual pane, clear glass, no coatings 0.480 R-Value">2.084 0.760 81%
Clear Tri Triple pane, clear glass, no coatings 0.310 R-Value">3.226 0.685 74%
LOW-E HS1-C180 Dual pane, one Low-E coating, Argon 0.260 R-Value">3.846 0.685 79%
LOW-E HS2-C180 Triple pane, one Low-E coating, Argon 0.184 R-Value">5.433 0.615 73%
LOW-E HS3-C180 Triple pane, two Low-E coatings, Argon 0.133 R-Value">7.521 0.560 70%
SUNSTOP HS4-C270 Dual pane, one SunStop coating, Argon 0.248 R-Value">4.033 0.367 70%
SUNSTOP HS5-C270 Triple pane, one SunStop coating, Argon 0.186 R-Value">5.377 0.338 63
SUNSTOP HS6-C270 Triple pane, two SunStop coating, Argon 0.124 R-Value">8.065 0.310 54
SYSTEM V HS1V-C180/i89 Dual pane, two Low-E coatings, Argon 0.209 R-Value">4.783 0.623 77
SYSTEM V HS4V-C270/i89 Dual pane, one Low-E & one SunStop coating, Argon 0.200 R-Value">4.998 0.361 69


Notes
Values are in METRIC. All performance for C.O.G. (centre of glass) ratings are based on Vision v4.0 simulations. All C.O.G U- and R-values are based on ASHREA Winter Conditions. Framing, cladding, frame type and other items will affect the overall thermal values of a complete window.

U Value: the total heat transfer out of a window (Btu/hr-sq ft-F or W/sq m- C). The lower the number the better the glass. 

R-Value: the amount of heat retained by the window. The higher the number the better the glass.

Solar Heat Gain Coefficient: the amount of solar radiation which enters the house through radiation. This is expressed as a dimensionless number between 0 and 1. It represents the heat gain through 3mm clear glass.

Visible Light Transmittance: measures how much of the visible light is entering the building through the glass. 1.0 would mean all of the light was getting through and 0 would mean none of it was getting through. Our atmosphere naturally filters out 5% of the visible light. Clear glass with no coatings lets in approx. 90% of visible light.