Verified profile
Updated: 21 April 2023

Installing solar since 2018

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4.72 from 143 Reviews

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SolarReviews Expert Rating Score:

A score we give a solar company out of 100 based on 13 criteria that our SolarReviews industry experts believe are the best criteria to separate good and bad solar companies.


Rating breakdown

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Certasun reviews

Breakdown of consumer reviews

Sales Process


Price as quoted


On schedule


Installation quality


After sales support


Latest good review thumbs up

T. A. | Oswego, Illinois | 05/14/2023

A pleasure to work with

5 stars for timely communications, being responsive, and keeping me up to date on all changes. This is particularly important given how long the approval process is. Everyone I talked to was informed and helpful. They have great pricing options.

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Latest bad review thumbs down

Anonymous | Grayslake, Illinois | 12/27/2022

Unprofessional and false timelines

This company was awful to deal with. The sales process was fantastic, they break everything down for you and give a nice presentation. When you sign up, you’re given a timeline as to when you can expect installation and activation. I signed up at the beginning of April and my panels weren’t online until mid October. I was advised that installation was going to be in June and they’d be activated no later than July. That wasn’t the case. The operations team doesn’t communicate internally so you’ll get multiple calls from different people asking for the same thing. Additionally, they don’t listen to voicemails or respond to their customers. You may even get an “accidental” email that berates you as a customer and tells you what you can expect. The sales gentleman is completely off from his timeline. Do not get your hopes up on what he says because it’s inaccurate. Lastly, I just put my Christmas lights up in November and found a full can of WD-40 under a panel. Now, had that can pressurized from the sun and exploded, my panels and roof would have been severely damaged. There are other great companies out there and honestly, so far my solar power is quite minimal and almost pointless.

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All reviews


Eugene Khoong | Downers Grove, Illinois | 04/21/2023


Responsible solar panels company. Great followup and responsive feedback from initial permit application to final installation completion. There is sufficient feedback information in each stage of the project. Any request for additional information or clarification is answered within 48 hours. For our system, the entire process took 6 months even it's going thru the winter months. Our solar system is up for running for 2 months now. The energy generated from the solar system is more than enough to supply our electricity demand. Approximately 20% extra is stored in the Grid for future use.

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Aashish Patel | Palatine, Illinois | 04/20/2023

Very responsive and efficient

The CertaSun team were never pushy when my wife and I were going through the decision making process. They were very helpful giving us facts and reworking proposals a number of times. Once we purchased, they had a great app where the entire project was managed out of from a tracking perspective. Communication was still old fashioned by phone and email, which was great for me! The installation crew were very mindful when on our property taking care to not disturb our garden. They got done - very clean job. The inspector and they came a week later, and all was well. I have recommended them to several friends who are now interested after I shows them my month to date savings. We got installed on March 31st, 2023 and should have made this decision years ago.

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Loretta | Chicago, Illinois | 04/04/2023

It was great. Everyone was competent and professional.

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NewHome Owner | Algonquin, Illinois | 03/13/2023

Happy with the team, equipment and process, from start to finish. System details / pricing was accurate, system looks good, conduit is hidden, installers didn't leave a mess behind, etc. They handled the State credit, City permits and the HOA approvals, too. Will definitely be recommending CertaSun / SunPower to all the neighbors in our new development.

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David Buddingh | Elmhurst, Illinois | 03/07/2023

Great Job

We loved our experience with Certasun and recommend them to anyone considering solar.

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Mike Miller | Naperville, Illinois | 02/20/2023

High Quality Solar Panels / Good Installation

As an Electrical Engineer, I was focused on getting the highest efficiency solar panels and the cleanest look on the roof. Certasun installation has NO conduits running on the roof. The crew was very efficient on installing the panels. The final installation looks great and performs as specified.

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Chuck & Dixie G | Yorkville, Illinois | 02/09/2023

Solar install.

Certasun was excellent from start to finish,Bill really knows his products.the installers were very helpful and friendly and very knowledgeable and respectful.The temperatures on installation day was below freezing and they were very friendly and considerate. The finished product looks great and is working great,.My wife and I are very pleased with the quality of the work .

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Channu K | Woodridge, Illinois | 02/03/2023

Good Service & Commitment

Good Service & Commitment; Completed the project as per the plan and info provided.

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David J | Oak Park, Illinois | 02/03/2023

Powerful and reliable system

Certasun did a fantastic job installing our 12-panel Sunpower system on a challenging roof. The installation looks much better than most others I've seen - close to the roof and no exposed conduit. The system provides more than 90% of our electricity to date (most months Comed bill is $14). Installation inside was very clean with monitoring box mounted where requested. Have had zero issues in past two years - system just works and generates power. Certasun was also very helpful and detailed with the financing and IL rebate process which all came through as expected. Highly recommend!

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Nicholson | Niles, Illinois | 02/01/2023


Everything was done well. Everything was explained. Installation was delayed for multiple reasons (some my fault), but eventually completed in a timely manner. A window was damaged in the process, but Certasun has promised to fix it.

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Solar panel cost calculator

Service types

Residential solar - Grid tied

Residential solar - Hybrid solar systems

Energy monitoring

SunPower SunVault

About Certasun

We will never subcontract your installation to a third party. Our own well-trained, licensed electricians and installers will install your system carefully and in compliance with all safety codes and regulations.

Certasun uses SunPower equipment, the highest-quality, highest-efficiency, best-warrantied, best-looking products in the industry. SunPower equipment comes with a 25-year Complete Confidence warranty that covers both equipment and labor in the unlikely event of any problem.

Office locations


Illinois - Buffalo Grove

1582 Barclay Boulevard, Buffalo Grove IL, 60089

Illinois - Buffalo Grove

1582 Barclay Blvd, Buffalo Grove IL, 60089


Better Business Bureau UL Certification

Contact Certasun

Location pin
Head Office
1582 Barclay Boulevard, Buffalo Grove IL, 60089