Interior design help for everyone.
As an interior designer, we get a lot of emails each day. It's always good to keep on the forefront of all things to do with design! This one is about windows. Read on for more information. Thank you to ATEC Energy & Building Envelope Consulting for the informative article!
SHGC stands for Solar Heat Gain Coefficient.
It measures how much of the sun's heat will pass through a window.
SHGC can be considered a percentage; for example, according to this NFRC Rating above, this window will only let in 30% of the sun's heat, so a window of an SHGC of 0.50 will let in 50% of the sun's heat!
The glass absorbs and redirects heat inward in three ways: conduction, convection, and radiation. Solar Heat Gain Coefﬁcient (SHGC) is a standard used in North America to estimate solar radiation that passes through glass relative to the amount of solar radiation hitting the glass.
Solar radiation tends to be the primary method of energy transfer through fenestration products. Factors such as reflection, absorption, and transmittance will affect the SHGC expressed as a number between 0 and 1 — the lower the SHGC, the less solar heat transmitted and the greater its shading ability. SHGC is tied to visual light transmission (VT) related to how well the glass allows sunlight to pass through it. Therefore the lower the VT, the lower the SHGC tends to be.
So, the lower SHGC rating means less afternoon heat and lower cooling bills for buildings in areas with very hot summers.
I hope this has been helpful!
If you need help with your window selection, we can certainly help, just fill out our quick interior design consult form and we'll get right back to you!
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Jil Sonia McDonald - Interior Designer of Jil Sonia Interior Designs.
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