Replacing single pane windows for energy star rated dual pane windows will save energy. This typically amounts to a small fraction of your total energy use, and given the expense of replacing windows, there are typically much more cost effective ways to reduce your energy bills.”
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A. Don’t base your purchasing decisions on what Industry is saying you consume. This may have been the way 5 years ago but now you have the technology to make accurate decisions. Had I followed the industry estimates I might have mistakenly purchased a new refrigerator.
B. Let the data drive your purchasing decisions. Following the data allowed me to save an estimated $700/ year even though I recently made a purchase.