Many Massachusetts homes have old single-pane windows that are very leaky. You can do a lot about this problem with thorough air sealing of all windows in your heated space (see Action 13).
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Much more expensive than air sealing??”but still far more affordable than replacing your windows altogether??”is installing new storm windows on the outside of your existing leaky windows. 
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The most pricey option (with the longest financial payback) is to replace your windows with new energy-efficient ones. Be sure to <b>do everything else possible to tighten up your home and conserve energy before you decide to replace your windows!</b>
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Installing new storm windows or replacing windows with new energy-efficient ones (for all leaky windows in your heated living space) will give you 800 pounds of CO2 savings per year.