Tilt-to-clean sash makes Pella double-hung windows a breeze to clean. Interior and exterior glass can be easily cleaned from inside the house.

Cam-action locks compress weatherstripping for a tighter-than-tight seal. They're recessed into the wood for improved functionality and appearance.

The windows can be raised from the bottom and lowered from the top to provide two levels of ventilation. Hot air is pulled from the ceiling to the outside from the top of the window. And cooler fresh air flows in from the bottom.

Pella brings the historic look and uncompromised beauty of true divided light into the 21st century with their patented Integral Light Technology. Architect Series windows feature ogee-shaped muntin bars permanently bonded to the inside and outside of energy-efficient insulating glass, with a nonglare spacer between panes of glass. Muntin bars are solid wood on the interior and wood or aluminum-clad on the exterior.