Duck Brand Window Insulation Kit 62 in x 630 in, Fits up to 15 Windows

Why it's worth it

This rolled-film kit covers up to fifteen standard 3-by-5-foot windows, so one box usually handles an entire apartment or small house. You cut the film off the roll instead of unfolding pre-sized sheets, which makes odd window shapes far less annoying.

The roll format is the reason to pick this one. Most kits give you pre-cut sheets sized for a standard window, which is fine until you hit a narrow bathroom window or a wide living room slider. Here you unroll, eyeball a couple of inches of margin, and cut. Three rolls of film and three rolls of tape come in the box, and Duck rates the whole kit for up to fifteen 3-by-5 windows.

Installation is genuinely simple. You wipe the trim clean and dry, run the double-sided tape around the frame, press the film on, then walk around with a hair dryer until the wrinkles pull tight. Scissors and a hair dryer are the only tools. Owners who describe themselves as nervous first-timers generally report the job going fine as long as they don't rush the taping step.

From our review of 8 window insulation kits and draft stoppers, by David Sinclair, Managing Editor

What we like

• +The roll format is the reason to pick this one
• +Installation is genuinely simple
• +Once shrunk, the film reads as a faint shine rather than a plastic sheet over your window
• +Owner feedback on this kit is unusually consistent across seasons

What to know

• –The included tape is the weak link, and it's the same complaint you'll find across most film kits
• –This is a one-season product
• –Fifteen windows is a lot of film if you only have three drafty ones