Solution and System Integrator
Harnois Greenhouses offers complete, turnkey services for commercial growers across North America. From custom design and certified engineering to manufacturing and installation, we ensure your commercial greenhouse meets your climate, crop, and business needs. With decades of experience and thousands of successful projects, our team delivers structures that combine durability, efficiency, and optimal crop performance.
Since 1965, Harnois has been more than just a greenhouse manufacturer; we are integrators of complete solutions and services, providing growers with essential predictability to plan with confidence. Known for their premium quality, our greenhouses are a wise investment due to their exceptional durability, delivering long-term savings.
With over 60 years of experience and more than 10,000 international projects completed, we bring unmatched expertise and credibility to the industry. Our commitment to innovation is reflected in our advanced engineering designs that align with growers’ financial and operational goals.
What sets us apart is the flexibility and creativity of our services. Each project is custom-designed to meet the specific needs of our clients. Our greenhouse structures are also built for sustainable agriculture, addressing today’s environmental challenges. Harnois greenhouses enable year-round growing, offering enhanced protection against increasingly unpredictable weather conditions.
With our unique approach, Harnois is more than a supplier—we are a dedicated partner in the success of every grower.
Custom Greenhouse Design Services
At Harnois Greenhouses, we have the capability to deliver greenhouse projects of any scale, from a single individual greenhouse to large-scale installations. Regardless of the project’s size, we bring the same energy and dedication to ensure innovative and sustainable solutions that address the current challenges of agriculture.
Climate change is a global concern, and we contribute to this cause by integrating modern and efficient agricultural practices into our projects. Our greenhouses combine cutting-edge technology, optimized water management, and integrated pest control, offering a model of efficiency, resilience, and environmental responsibility.
Our 4 types of structures
Vertical Approach to R&D
Through advancements such as climate control systems and automation, we maximize production while minimizing carbon footprints. Our closed-loop water management systems reduce waste and optimize resource use, making our greenhouses particularly effective even in the face of climate challenges.
Every greenhouse project also contributes to the local economy. Controlled environments bring stability and predictability to yields, enhancing investment attractiveness and creating direct and indirect jobs. By providing comprehensive services & support —from training local teams to sourcing materials—we actively support economic growth in the regions we serve.
At Harnois, we take pride in supporting every grower, big or small, in building a more efficient and sustainable agricultural future.
Certified Engineering for Any Climate
Every Harnois greenhouse is backed by certified engineering to ensure it meets local building codes, site-specific conditions, and crop requirements. Our in-house engineers evaluate snow loads, wind patterns, and soil conditions to deliver stamped plans that guarantee safety, compliance, and long-term performance. Whether you grow in the harsh winters of Northern Canada or the humid summers of the Southern U.S., your structure is designed to withstand the elements while providing a stable, predictable growing environment.
Our Differentiators
Professional Installation & After-Sales Support
Our work doesn’t end with manufacturing. Harnois Greenhouses offers professional installation services to ensure your structure is assembled to the highest standards. Our experienced crews and trusted partners handle every step—saving you time and reducing the risk of costly errors. Once your greenhouse is operational, our after-sales support team remains available for maintenance guidance, part replacements, and technical assistance. We’re committed to keeping your greenhouse performing at its best for decades to come.
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