Affordable Clean Energy For No Money Down!

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Kauai & Oahu’s Solar Energy, Roofing & Air Conditioning Specialists


STI Solar Roofing & Air Conditioning is a local company that specializes in professional installation services for residential and commercial solar energy systems, roofing and air conditioning. With a focus on continuous training and customer service, we bring affordable, high-quality products and services to our customers.

With an STI Solar Energy System, homeowners can save thousands and take control of their energy needs. Our mission is to provide electricity at the lowest possible cost through systems that are designed and installed to generate the most power per panel. With lower installation costs, strong government incentives, increasing energy costs and our solar financing programs, you can now take charge of your energy needs. STI Solar makes it affordable and easier than ever to make the switch to solar energy for your home.

We offer $0 Money Down for all of our services!

We offer the industry’s leading financial options for your solar systems
and new roof including leases, loans, and PPAs.



STI Solar supports local community outreaches, such as the Boys & Girls Club, The Rotary Club, and the Aloha Angels. We love giving back to the community and empowering the lives of others.

Customer Testimonials

“I am very please with the solar AC system installed by STI Solar. When I considered solar AC, STI Solar’s owner Devin Ruiz was responsive and knowledgeable – answered my questions, promptly scheduled an on-site visit to assess my requirements/discuss options and provided detailed equipment stat sheets to include warranty info. He even put me in touch with his CPA to ensure my solar tax credit questions were answered accurately. The cost for the 12K BTU and 18K BTU split system installed was lower than other estimates received and there was never any sales pressure. Plus, STI Solar is a local business supporting many local organizations, so it is satisfying knowing my solar investment helps both the environment and the Hawaiian community.”

Mike L.

“STI Solar delivers an amazing experience for all your solar needs. It starts with dedicated time explaining the how and why of what would be done and the different possibilities, maintained communication thru the permitting and installation process, owner personally validated quality of work and they followed-up after system startup to ensure everything was working. Overall a wonderful experience where we felt great about our decision to install solar and the company we chose. We have already referred STI Solar to several friends.”

“We are extremely satisfied with our solar system from STI Solar. The team was very knowledgeable, kept us informed, cleaned the worksite each day and maintained a friendly demeanor even with my dog barking at them every time they passed the back door. We will definitely recommend STI Solar to our friends and family. Mahalo.”

“Mahalo to STI Solar for our solar PV and solar hot water systems. My wife and I were very pleased with their professionalism and customer service. They did what they said they would do and more. They offer a great value and their finance programs are really saving us a lot of money on our energy bills. Nice to see professional contractors like STI on Kauai. We will be referring them to our friends and business colleagues at our real estate office.”



STI SOLAR, a division of the Solar Training Institute, is the ONLY full service solar company whose installation teams are professionally trained and have completed the NABCEP certification training program. Most companies hire people without experience and train them “on the roof.” Organized, certified training of solar workers ensures a better product, and a safer and more reliable installation of your PV system.


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