Solar Heat Gain Coefficient (SHGC)
A 0–1 measure of how much solar heat passes through a window — lower numbers block more heat.
Quick answer
Solar Heat Gain Coefficient (SHGC): A 0–1 measure of how much solar heat passes through a window — lower numbers block more heat. Typical cost: No direct cost — drives glass coating selection..
Why it matters
SHGC matters as much as U-factor; in cooling-dominated climates, picking SHGC ≤0.25 can cut summer AC bills 10–20%.
Typical cost
No direct cost — drives glass coating selection.
Pros
- • Critical for hot-climate efficiency
Cons
- • Trade-off with passive winter heating
Common uses
- • Southern and southwestern US homes
Alternatives
Exterior shade screens (retrofit)
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Frequently asked questions
- What SHGC is best for Texas?
- Aim for 0.20–0.25 on west- and south-facing windows.
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Estimates and guidance are educational. Always confirm with a licensed local professional before making decisions.