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I am curious if there are any websites that list the performance of stainless steel vs. super spacer. Other than the edgetech website of course. Thanks

Both are good. The Super Spacer will have better edge of glass performance numbers.

Super Spacer may lower the U-Factor .01

is there any truth, that the steal spacers can cause the windows to shift and warp. Or that they can break the seal on the glass and release the gas inside.

No.

Whenever a salesman starts using false fear and smear tactics against his competitors, it's time to show him the door.

So my father inlaw says he and i could install my basement windows (5), for $400 and it wouldnt even take 1/2 a day. or that i could even do it my self in that amount of time. BTW 400 almost 4-5x less then what most companies were quoting me.

I guess im asking if getting window kits from home depot/ lows are just as good quality as having window companies do it.

Are there warranties are the same? If this window i buy from lows (example) can warranties be defalted if instalations/ were incorrect.

I feel safer having a life time warrenty from a company. help