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Certasun

Certasun is a top-rated local company serving the Chicago and Milwaukee areas. We provide home solar, battery, and EV charger installations with integrity and professionalism. Here's what makes us different:

1. A GREAT CUSTOMER EXPERIENCE
You don’t need to believe us — just look at our reviews! You deserve a solar company that respects your time, intelligence, and home. We’re serious about making sure our customers feel like they’re getting the most care when they work with us. We are incredibly proud of our near perfect reviews on Google and SolarReviews.com. They tell us we’re doing something right.

2. WE DO EVERYTHING IN-HOUSE
It is not possible to guarantee a great customer experience when important parts of your project — such as sales, installation, or incentive processing — are handled by subcontractors.

3. OUR INTERESTS ARE ALIGNED WITH YOURS
We guarantee the energy production of your system over its lifetime. We also guarantee you’ll get the incentives you see in your installation agreement.

4. YOUR SYSTEM WILL LOOK GREAT
We don’t take installation shortcuts. Don’t assume all solar panel installations look the same — they don’t.

5. YOU DECIDE HOW TO PAY
We will advise you on available financing options, but won’t push you to use any one of them.

Learn more about us at certasun.com!
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4.5
Reviews
EnergySage Rating
4.5
EnergySage Reviews
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Headquartered in Buffalo Grove, Illinois, Certasun strives to be the best local solar company serving northeast Illinois and southeast Wisconsin. We want you to feel confident and excited about going solar. Whether your goal is to save money, reduce your reliance on the grid, or help the planet, we will serve you with integrity and professionalism. We handle every detail of your project in-house, with our own employees, so that we can ensure the entire organization is accessible to you and focused on delivering the best experience and outcome.
Year Established
2018
Phone Number
3126380800
Reasons Why You Should Work With Us
  1. We provide a top of the line customer experience

  2. Your installation will look & perform great

  3. Our low-pressure, educational approach is loved by homeowners

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Elite installers earn top ratings from customers, endorsements from vendors, and win customers more frequently than their peers.

The EnergySage Installer of the Year awards recognize installers with a vetted track record that deliver superior customer service and consistent positive reviews.

We speak

English

Certasun is the local expert in residential rooftop solar, solar batteries, and residential electric vehicle charger installations. When you work with Certasun, you get much more than just equipment. We will consult with you to find the clean energy solutions that meet your needs. We ensure you’ll get a product — and an experience — that will go above and beyond your expectations.

Services Offered

  • Installation
  • Electrical Contracting
  • Solar Repair & Maintenance

Certasun wouldn’t be where we are today without our outstanding team. We work hard every day to provide a customer experience that’s in line with our values: being honest, knowledgeable, accessible, and trustworthy. As a full-service solar installer, our employees handle every detail in-house from start to finish. The lifecycle of a Certasun solar project begins with our team of knowledgeable solar consultants who will work with you to find the solar solution that works best for you. You’ll move on to work with a project manager in our operations team, who will work with our engineering and permitting departments to get your project moving. Your system will be installed by our expertly trained team of electricians and solar installers who will drive your project to completion. We won’t forget about you after you’re installed; our customer success team will be there to monitor your system and address any future questions.

Associated product manufacturers

Associated financing companies

Workmanship Warranty

Our workmanship warranty is 10 years and includes a 10 year guarantee against roof leaks caused by the solar system.

Licenses

Business Incorporation: 0676322-7

Insurance

We are fully insured and bonded.

Certifications

Certified by the State of Illinois to install solar.

Industry Certifications

  • Better Business Bureau

Manufacturer Certifications

  • REC Certified Solar Professional

What Customers Are Saying

4.5
24 reviews
4.5
Average Rating 24 review(s)
Response
4.4
Quality
4.7
Value
4.4
Service
4.5
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EnergySage Shopper
Solar panel installation

I requested for a quote from certasun for my solar panel installation. The salesperson set up a microsoft teams meeting, but never show up for the meeting. next day when I e mailed him about what happened, he said that due to bad weather he could not show up. Then set up another one, and that went well. He made an estimate for me, which was much higher than the other installers. When I said that I am evaluating different options, he keep on saying about the negative things of others, rather than the advantages of going with certain. To him all other installers are very bad and only his company is genuine. He keep on forcing me to take a decision at the earliest as if the entire company is waiting for me. Finally I signed his contract and he cancelled it from his side saying that I need to sign IL shines agreement first and then contract with Certasun. He never told me to do so before signing the contract. At that point I took a break and looked at other providers proposal. But he keep on compelling me to sign as if I need to sign at a knife point. I did not like the way the treat their customers.

Posted by sajimu66 on Jul 20, 2026
EnergySage Shopper
Nice folks, everything works, best for bottom line.

All the folks I interacted with from getting the quotes, chosing the design and system options, installation, permitting, etc were nice, knowledgeable, and helpful. The process from beginning to end takes a couple months or more, but my system was installed and operational faster than I expected. Some delays in the process came from my side, my misunderstanding. Certasun reps were very understanding and helped me through the entire process. I got a few quotes from other solar installation companies and Certasun had the best finanacial bottom line for me. They told me about rebates/net metering options and educated me on the full amount of SREC and other tax credits I am entitled to and helped me to apply for all of them. Other companies failed in this regard. I strongly recommend checking out and going with Certasun!

Posted by roberttseng on Mar 12, 2025
Beware of what they promise

I used Certasun to install my solar back in 2021 and my Tesla Powerwall3 system late last year. From a technical standpoint, they are good. But it's the business side that's left me feeling scammed. They called me last year to sell me on the Tesla Powerwall3 system. They said with the federal tax credit and a ComEd rebate program, my net cost would be around a 1/3 the full price. I've worked with them before, so I trusted what they quoted. I got the federal tax credit for last year, and was waiting for the ComEd rebate check. I checked with them back in May, and they said I should get the check by early July. It's August, so I emailed last week and Jennifer said she should know by tomorrow. And I haven't heard anything from her since. She's ignored my emails and calls. Today, I decided to call ComEd directly to get the status. I was informed that my application was rejected because it only included the battery storage and that my solar was installed before 8/2022. They sent the rejection back to Certasun, so they've known for months and didn't say anything to me. They should have known the parameters of the ComEd rebate program. I don't know if this is incompetence or out rights lies, but they haven't tried to make it right. They're just ignoring it and hoping I'll just go away it seems.

Posted by mkc1378 on Aug 07, 2026
My solar system experience

Based on a neighbor's advice, we decided to use Certasun for our Solar Installation. We had an issue where the system was temporarily left on after initial connections to the grid were made for testing. Since the Permits were in process, we disconnected and Certasun turned on the system promptly thereafter. We had a service call a slight misalignment of a panel connection, and Certasun people showed up and fixed that even though it had not affected our energy production. There were no surprises during the entire process. I happened to call Cetrasun for a Battery backup for this system and was shown that I will be at breakeven on the cost of our system in less than 6 years from Installation, while we thought it would be 7 or more years to achieve that. We are thrilled and 100% satisfied with our decision to use Certasun.

Posted by klkm81a on Jul 28, 2026
My Crertasun experience

Great to save money on my electric bill, the Certasun people have been extremely helpful in guiding me through the process and following up. I heartily recommend them!

Posted by rietmarzaroli on Mar 19, 2026
No problems!

I started my solar investigation in the spring of 2024 and the project was finished at the end of June 2024. I "interviewed" many companies, but Paul was my first and last sales person. Certasun did an excellent job making their way through the long process to get my system installed and hooked up to Comed. Suggestion: when looking for a solar company ask for the differences of different brand/type of panels and all the different financing choices.

Posted by scarab8 on Dec 18, 2025

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