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The windows, themselves, can be made of glass, rigid plastic panels, or flexible plastic sheets. Glass offers the best visibility.
Storm window units range from $100 to $300 depending on the type of material used. Plastic framed versions are the least expensive option, while wood tends to be the most expensive. Labor costs for installation generally run $70 $130 per window. Storm windows can help reduce heating and cooling costs by up to 33% or more.
Costs vary greatly by region (and even by zip code). To get free estimates from local contractors, please indicate yours.