Money Saving: By using interlocking sashes and double or triple continuous uncut weather-stripping, our double hungs seal out cold and seal in heat better.Solid Construction: Our double thick reinforced vinyl walls stand up to the elements better and longer than thinly designed cheaper double hung windows.Don’t ever worry about your windows as Polar Seal’s Premium Warranty is backed up by our over 70 year history of taking care of our customers better than any other. Worry-free ownership: All the parts we use were carefully selected from 35 years in the vinyl window manufacturing industry.CLICK HERE for more Royal Seal info.Īdvantages of our double hung vinyl windows: We refer to these as our Royal Seal windows. How do I operate my double hung window? CLICK HERE to view a PDF. A single hung window’s top sash is fixed in place and cannot move or tilt in, but the bottom is operable. A double hung window’s top sash and bottom sash can move up or down and can also tilt in for easy cleaning.

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