Improving the Energy Efficiency of Existing Windows

You can improve the energy efficiency of existing windows by doing the following:

• Adding storm windows

  Reduce air leakage and some heat transfer

• Caulking and weather stripping

  Reduce air leakage around windows

• Using window treatments or coverings

  Reduce heat loss and/or gain

However, if your home has very old and/or inefficient windows, it might be more cost effective to replace them than to make these improvements. New, energy-efficient windows eventually pay for themselves through lower heating and cooling costs, and sometimes even lighting costs.

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