Window upgrades can reduce the costs of heating and cooling your home as well as offer greater insulation from outside noise. Many homes in the region have standard single paned windows, which offer the least amount of energy efficiency.
Upgrade Existing Windows
US Department of Energy suggests 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
Replace Old Windows
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. You'll find that you have several options to consider when selecting the best windows for your home.
See the US Department of Energy site for additional window information. www.energysavers.gov/your_home/windows_doors_skylights/index.cfm/