National Solar Rankings

Certasun

0BBB Complaints (3yr)Excellent
8Years in BusinessFounded 2018
85.3/100Overall Score

Detailed Profile

Certasun was founded with a single purpose: to bring honest, transparent solar installations to the Chicago suburbs. Based in Buffalo Grove and focused exclusively on solar, they have spent 8 years carving out a reputation as the most trusted residential installer in greater Chicagoland.

What earned Certasun the top ranking in Illinois was their combination of customer satisfaction, clean compliance record, and focused expertise. In a state where the market is dominated by national brands and local contractors moonlighting as solar installers, Certasun was built from scratch to do one thing well. Their 4.8-star rating from 309 reviews reflects that focus.

Certasun is NABCEP certified and takes advantage of the Illinois Shines Adjustable Block Program, which provides ongoing SREC payments for 15 years. Their sales team is particularly effective at explaining how SRECs work and how they factor into overall economics, which is critical in a state with a complex incentive structure.

The company designs systems tailored to the Midwest's four-season climate, accounting for snow load, shorter winter days, and the diverse housing stock across Chicago's suburbs. Their monitoring team proactively contacts homeowners if output drops below expected levels, and multiple reviewers mention getting a call from Certasun before they noticed an issue.

With a composite score of 85.3, Certasun is our top-ranked solar company in Illinois for 2026.

Equipment & Products

Solar Panels

SunPower

Certifications

NABCEP Certified

Warranty & Guarantees

Production Guarantee
Yes

Operations

Company Type
Local / Regional

Financing Options

cashloan

Google Reviews (8)

Mark S.

“I'm writing this review 2.5 years after install. I was very pleased with the quoting/consulting stage of the process, as all of my questions were addressed well, and the financing stage was very...”

Arnell P.

“After researching and getting quotes from several companies I am confident we made the right choice going with Certasun. Their value on cost per KW was in line with other companies and their...”

Nilesh P.

“First and foremost, I appreciate the comprehensive and detailed information Certasun shared about the solar panel system. They patiently addressed all my questions and concerns throughout the...”

Eamon N.

“My experience with Certasun was mixed. They did a good job on the final installation. But I believe that they messed up badly on the initial site assessment. They concluded late in the day (as it was...”

Krystian W.

“I'd highly recommend Certasun in Buffalo Grove, IL! Their sales team was fantastic - informative, pressure-free, and designed the best solar panel system for my needs. They use top-of-the-line...”

Elliot R.

“I interviewed 5 different Solar Panel Installers and Certasun was by far the most professional, knowledgeable, and responsive, providing a truly comprehensive and complete experience. They answered...”

Nicholas S.

“Just had my solar panels installed by Certasun and I couldn’t be happier! They made the whole process super easy, took care of everything from the city permit, ComEd rebate, SRECs paperwork, and even...”

Nathan P.

“I signed with Certasun in March 2025 expecting that, as a nearby company, they would be efficient and familiar with my village’s codes and inspection process; instead, almost every stage took longer...”