New window films can reduce heat lost through windows by more than 50%.

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Another tip: Security window films, such as the Hardglass window film sold by CHB Industries, can make it tough for a casual intruder to punch out a window.

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In looking at trends in the top 10, six films opened in North America in the late spring through summer window, which Hollywood views as its summer period.

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Only the biggest, most popular films can stick around for longer than three months anymore, and they have a narrow window of a few weeks in which to make their profits before audiences turn their attention elsewhere.

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