For example, here in FL we have Dual Enrollment and Early College programs (they may be called something else in NY) where in your last two years of HS, you can take courses at a local college for both HS and college credit.

Windows are dual pane vinyl.

If you have dual-pane windows, then it's highly likely you (and the tenants) were never told the right way to clean themNEVER use a cleaner with ammonia !!

I also like the dual air gauges that allow variable pressures.