If all else fails, call your power company for references. That's how we ended up finding ours. There is usually a whole division set up for helping consumers conserve energy.
We had competing companies come out and give us estimates. The one higher-end window company told us how crappy Wallside was compared to their product, but their product was almost twice as expensive. We got 7 windows (I think) replaced by Wallside and we have been perfectly happy with them (and have seen a slight reduction in our energy bill, but then the old windows were really crappy).
Wallside did all the windows in the north campus co-ops and royally screwed them up. otoh, they have a generous repair guarantee, and we never called on it because of some bizarre politics with maintenance. But I'd still consider them un-recommended if you can find anyone more promising.
I live in Seattle but found that calling the power company turns up many reputable contractors... i am in the process of pickingf out new windows meself. Good luck dan'a
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Too cool.
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i am in the process of pickingf out new windows meself.
Good luck
dan'a