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Is it necessary to have steel / metal framing in a replacement vinyl window? We're getting ready to replace our existing aluminum windows. Two different company's have told us that it is better to have a vinyl replacement window which has a steel framing in the structure so the vinyl can't buckle over time (i.e. Polybau and Window World). Is it really necessary to have this metal framing in the structure or does it depending on the size of the window? We have one very large window, 120" width x 60" height which I would find this to be very important in the long run. If it is recommended, can anyone recommend other brands with great NFRC ratings that have metal framing in the vinyl windows structure besides the two I have already listed? I am in Northern California, so please keep in mind available brands. Thanks much! One thing I failed to mention, I am not referring to the spacer between the panes of glass, but the actual vinyl framing. Thanks again. Can someone tell me why it isn't important if you say no?

Do you find any energy saving after you put in new Replacement Windows? I need to hear some comments on the money we spent on the replacement windows. We have this done a year ago and the same month usage on our utility bill did not reflect any savings in cost nor in the consumption. If you have different observations, please shae your experience. I visit a replacement window web site (http://www.replacement-windows.com/consumer-ratings/companyList), the behaviour and attitude on this site are very unusual. It locked the new posts and do not have any customer feed backs.