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Business Details
We are a trusted leader in renewable energy solutions, serving Southwest Wisconsin, Northeast Iowa, and Northwest Illinois since 1977. With over four decades of experience, we specialize in solar electric and thermal systems, combining traditional energy appliances with cutting-edge solar technology. Our team of NASS-certified technicians undergoes rigorous ongoing training to stay ahead of industry standards. As a member of the North American Solar Stores network, we prioritize transparency and client education, offering personalized reports to clarify solar benefits. We understand the complexities of federal and state incentives, ensuring clients maximize savings while transitioning to energy independence.

Our mission is to reduce reliance on utility companies by providing durable, efficient systems tailored to residential, commercial, and agricultural needs. We take pride in our regional reputation for excellence, built through decades of delivering cost-effective, sustainable energy solutions. By maintaining partnerships with organizations like the MREA and ISPQ, we ensure our expertise remains unparalleled. We believe solar energy is the future, and our comprehensive services reflect our commitment to advancing this vision. Every installation is designed to meet specific client requirements, backed by our dedication to quality and customer satisfaction.
Highlights and features
  • We offer 40+ years of proven expertise in renewable energy systems.
  • Our NASS-certified technicians complete rigorous ongoing training programs.
  • We provide personalized reports detailing solar benefits and ROI projections.
  • Our team navigates complex federal/state incentives to maximize client savings.
  • We deliver comprehensive solutions combining solar with traditional energy appliances.
Services
Solar Electric Systems
We design and install solar electric systems for residential, commercial, and agricultural clients. These systems generate clean energy to reduce reliance on utility companies, lowering monthly costs. With expertise since 1977, we ensure efficient, durable installations tailored to each client's unique energy needs and property specifications.
Solar Thermal Systems
Our solar thermal systems provide efficient hot water and space heating solutions. Engineered for diverse property types, they reduce energy expenses and environmental impact. Backed by NASS-certified training, our technicians deliver reliable, high-performance thermal solutions that integrate seamlessly with existing infrastructure.
Solar Panel Installation
CSI Sun's installation services utilize advanced solar panels for optimal energy capture. Our NASS-trained technicians ensure precise, durable installations that meet rigorous industry standards. Each project is customized to align with specific energy requirements, budget constraints, and long-term sustainability goals.
Free Custom Report
We offer a complimentary custom report analyzing solar potential for each client's property. This detailed document outlines financial incentives, projected savings, and system recommendations. It empowers informed decisions by clarifying the full economic and environmental benefits of solar adoption.
NASS Showroom Experience
Our physical showrooms provide hands-on demonstrations of solar systems in action. Clients can consult with experts to understand incentives, system options, and ROI timelines. This immersive experience simplifies complex decisions, fostering confidence in the transition to renewable energy.