Overall, the best window insulator kit is the Duck Brand Indoor Insulator Kit for its easy installation and its ability to be reused, which saves you money in both the short and long term.

This window insulation kit easily applies using just a hairdryer, and can be cut once applied for easier installation. Amazon's choice Frost King V73/9H Indoor Shrink Window Kit ...

Duck Brand Indoor 5-Window Shrink Film Insulator Kit ($24.20) Amazon For $24.15, you can insulate up to five standard-sized (3 by 5 foot) windows for a drastic uptick in energy efficiency.

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At $7 each, this insulator kit from Duck is a steal — especially considering that it has a 4.4-star rating. Each kit comes with enough materials to insulate three 3-by-5-foot windows. The film ...