Certasun

Certasun is a full-service residential solar company founded in 2018 by Josh Lutton and is headquartered in Buffalo Grove, Illinois. The company specializes in installing residential rooftop solar systems, home battery storage, and electric vehicle (EV) chargers, primarily serving the Chicago and Milwaukee metro areas in northeast Illinois and southeast Wisconsin. As the largest Illinois-based solar installer, Certasun has installed over 2,500 solar systems and is recognized for its commitment to using high-quality equipment from partners like REC, Maxeon, and Enphase.

The company’s key differentiator is its “everything in-house” model, meaning every step of the project, including sales, installation, engineering, and incentive processing, is handled by their own employees without subcontractors to guarantee a superior customer experience. Certasun focuses heavily on integrity, professionalism, and aesthetics, ensuring that installations are clean and visually appealing by hiding conduit and hardware whenever possible. They also guarantee the energy production of the system over its lifetime and ensure customers receive all promised incentives, making them a trusted, top-rated provider with an A+ rating from the BBB.