Although your double-hung single-pane windows with interior storms are certainly not the most energy efficient available, it would not be cost-effective to replace them from an energy savings perspective alone. As an example, for a two-foot by four-foot window this would equate to $8 in annual savings. If you compare that to the $400 or higher cost for that window, you are looking at a multiple decades payback period. So try using our weatherazation tips to help lower costs.
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