Long Windows is the exclusive provider of the "Quantum2" window from SeriousWindows™ in the Washington, DC, Maryland and Virginia areas. Long Windows outperform other major brands in terms of R Value and U-Factor, two key scientific measures of energy-efficiency. In fact, they exceed ENERGY STAR® requirements.

Add in the Long Windows Lifetime Warranty, commitment to superior service and legacy of satisfied clients and there's no comparison to other window providers.
Request a free, no obligation in-home consultation and estimate today or call us at
1-800-417-LONG (5664).