This was then (early this morning & for last 40 years)
This is now
It's even been certified by the National Fenestration Rating Council
The new window has a U-Factor and a Solar Heat Gain Coefficient and Visible Transmittance
All of that must be good!
(I wonder how one gets appointed to the National Fenestration Rating Council and if it pays members to attend meetings at 5 star resorts at least twice a year. If so, I'm interested.)
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