Harnois Greenhouses has been designing, engineering, and manufacturing complete turnkey greenhouse solutions for commercial growers across North America for over 60 years. From structural design and permitting to installation, automation, and after-sales support, Harnois manages every phase of your project — so you can focus on what matters most: growing.
Whether you are planning a small-scale operation or a large agro-industrial facility, our team of engineers, agronomists, and project managers works closely with you to deliver a greenhouse built for your climate, your crops, and your budget. As the only North American manufacturer to design, engineer, and build all structures entirely in-house, we offer a single point of accountability from the first design meeting to the last service call.
What Does a Turnkey Greenhouse Solution Include?
A Harnois turnkey greenhouse solution covers every step from concept to first harvest. This includes structural engineering and site preparation guidance, energy-efficient glazing systems (polyethylene, polycarbonate, or glass), climate control and automation equipment, heating and ventilation systems, irrigation and fertigation, and full installation by our certified technicians.
Every project is custom-built to your crop type, climate zone, and production goals. There is no off-the-shelf approach at Harnois — each structure and equipment package is engineered specifically for your operation. Explore our full range of commercial greenhouse structures to find the right configuration for your project.
How Energy-Efficient Systems Reduce Your Operating Costs
Energy costs are one of the largest variables in greenhouse production. That is why every Harnois turnkey solution is designed with efficiency at its core.
Our energy-efficient systems include double-layer polyethylene cladding with thermal screens, heat recovery ventilation, AI-driven micro-climate management, and optional integration with renewable energy sources such as geothermal and solar. Our flagship Vermax glass greenhouse is designed under Nearly Zero Energy Building (NZEB) principles, achieving a coefficient of performance (COP) of up to 7.5 and delivering up to 70% reduction in GHG emissions compared to conventional structures.
Combined, these technologies can reduce heating costs by up to 40%, significantly lowering long-term operating expenses and improving the financial predictability of your growing operation. Discover the full range of greenhouse equipment and automation technologies available for your project.
Automation & Climate Control: Growing Smarter
Modern commercial greenhouse production demands precision. Harnois integrates advanced climate control automation, fertigation systems, and environmental monitoring directly into every turnkey greenhouse project. Our systems are compatible with AI-driven controllers that provide real-time data on temperature, humidity, CO₂ levels, and light intensity.
Automated systems improve consistency across growing cycles, reduce labor costs, and give growers actionable data to optimize crop yields season after season. Every commercial greenhouse structure in our lineup — from the Luminosa gutter-connected greenhouse to the Ovaltech freestanding model — is fully compatible with our automation packages.
Built Stronger: The Harnois Oval Steel Advantage
Every Harnois greenhouse is built using our exclusive oval steel tubing, manufactured from 50 ksi certified structural steel — 52% stronger than standard commercial-grade steel rated at 36 ksi. Combined with Galvalume coating for superior corrosion resistance, our structures are engineered to perform in the harshest North American climates for decades.
The oval profile also means fewer arches, more open growing space, less shadowing, and better internal air volume for stable temperature management. This structural advantage translates directly into better crop performance and a longer return on investment.
Whether you choose a freestanding greenhouse, a gutter-connected greenhouse, or a Venlo glass greenhouse, every structure benefits from this proprietary technology.
Crop Types Suited for a Harnois Turnkey Greenhouse
Harnois builds turnkey commercial greenhouses for a wide range of crops and industries. Our structures and equipment packages are adapted to the specific light, humidity, and temperature requirements of each crop type, including:
- Produce: tomatoes, cucumbers, peppers, and leafy greens
- Ornamental & Floriculture: cut flowers, bedding plants, and potted plants
- Young Plants & Tree Seedlings: propagation and reforestation operations
- Soft Fruits: strawberries, raspberries, and blueberries
- Cannabis: controlled environment cannabis production
Browse our crop-specific greenhouse solutions by industry to see how we tailor each project to your production needs.
Project Timeline: From Design Approval to First Harvest
One of the most common questions we receive is: how long does it take to build a turnkey greenhouse? A standard commercial greenhouse project with Harnois typically takes between 8 and 15 weeks from design approval to delivery and installation, depending on the size and complexity of the project.
The process follows five structured steps: discovery and site evaluation, engineering and design, approval and planning, manufacturing at our Quebec facility, and delivery with installation. Because Harnois designs, engineers, and manufactures its structures entirely in Canada, lead times are predictable and supply chain disruptions are minimized.
Want to see how real projects come together? Visit our completed greenhouse projects page to explore case studies from growers across North America.
After-Sales Service & Ongoing Technical Support
A turnkey greenhouse project does not end at installation. Harnois provides ongoing technical support, spare parts, preventive maintenance services, and agronomic guidance long after your greenhouse is operational. Our network of certified technicians serves growers across Canada and the United States, with fast response times and deep expertise in both Harnois structures and integrated equipment.
Our capabilities and services page provides a full overview of what our team can do for your operation after the build.
Why Choose Harnois for Your Turnkey Greenhouse Project?
Harnois is the only North American greenhouse manufacturer to design, engineer, and build all its structures entirely in-house. This vertical approach means tighter quality control, better performance in harsh climates, and a single point of accountability from the first design meeting to the last service call.
As a family-owned company with over six decades of experience, we have built lasting relationships with growers across generations — from small family farms to large-scale commercial operations. Our exclusive oval steel tubing, manufactured from 50 ksi structural-grade steel, is 52% stronger than standard commercial-grade alternatives, delivering a longer structure lifespan and better return on investment.
Ready to start planning your turnkey greenhouse project? Request a quote from our team and we will get back to you with a personalized proposal within 48 hours.
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