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Just got pitched for these (the "Advantage series, I think) by a very likable installer and they look...OK...

Not thrilled by block and tackle mechanism, but only because my old, crappy windows had'em and they're falling apart.

Low-e Argon, U-Value .29, seems to be about right for this type.

Anyone have'em? Sell'em? Like'em? Hate'em?

Never heard of them but I would not be disheartened by the block and tackle balance system. They are very good now and days.

I am also looking into the Mercury brand of windows.
In particular, I am looking at their Harmony series double hung (triple pane). I think the Harmony is their top of the line....
Here's a link to some of the info/specs:
http://www.mercuryexcelum.com/images/cu ... armony.pdf
http://www.mercuryexcelum.com/Content/Double_Hung.asp

They are a Connecticut company...apparently been around a long time....The installer I expect to use recommended them....
Not much on any message boards about them, but that doesn't mean they aren't any good, right?
Anyone have any opinions/experiences with Mercury?

thanks.
mm

Unfortunately, it seems that none of the pros have any experience with Mercury.....

Well, let me ask the question this way.
Mercury Excellum is on the NFRC list of approved manufacturers.

Does that make it a good window? Or are there bad manufacturers and bad windows that are certfied by the NFRC?

Thanks.
mm