On May 8, 8:33*pm, wrote:
* * * *i use window world for my rental houses . they install a 2 pane
with low e glass for 220.00 . i dont remember what the argon would add
to it. but the ones i get from them are as good as the 500.00 ones other
outfits offered and better that the 350.00 ones from home depot..

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If its not energy star rated then you are just fooling yourself on it
being equal to a 500 window, you realy get what you pay for, its a
competitive business.