mixing double/triple glazed windows
Oberon and the other window mavens - I hope you're out there!
What's the wisdom on having a mix of double- and triple-glazed windows? We're building in a particularly harsh environment - on the ocean in NH.
We're sold on the notion of using double glazing in the 3-season porch - no heat in there. And in the cellar; we have two awning windows there.
But . . .we're wondering about investing in triple glazing on the north and east sides and double on the west and south (where we are cheek-to-jowl up -- less than 20 feet -- against another house that blocks the wind).
We're going with Paradigm windows, a vinyl product made in Portland, ME, because of friends' recommendations. They were used in a LEED-certified home here. U-rating of the triple glazed windows, LowE with a blend of argon and krypton is .20. Their double-glazed are .28 (argon/LowE).
The rep and our designer argued about keeping the whole house at the same u-rating. What do you think?