Built to keep you safe.

At Napco^® Window Systems, we understand that a big part of feeling at home is feeling safe. It’s why making our replacement windows and patio doors the most secure you can buy has always been a top priority.

Cam-action locking system

Our double-hung and sliding windows feature two sash cam locks on windows over 25” wide.

Ventilation limit latches

Ventilation limit latches allow double-hung windows to open only partially, letting fresh air in while keeping intruders out.

Single-lever, multi-point casement locking

Our casement locking system secures the window tightly along the jamb with multiple locks and is activated by a single locking handle.

Added protection for patio doors

3500 Premium Sliding Patio Doors come standard with a single point lock, or for added peace of mind choose the optimum security of the optional footbolt lock.