APCO is a window and door contractor serving homeowners in the Columbus area. It installs a wide variety of windows, including traditional styles and storm windows. The company offers different materials for patio, storm, and entry doors such as glass, vinyl, and steel. Additionally, it provides the installation and replacement of siding, gutters, decks, and sunrooms. APCO was founded by Bill Clarkin Sr. as a siding company in 1962 and has evolved to a full-service home improvement company in 1976.