About us

HarnoisHarnois Greenhouses is a division of Industries Harnois Inc., a Canadian manufacturer of steel structures.


  • To develop and manufacture greenhouse structures that contribute to the achievement of the horticultural, financial and environmental goals of our customers.
  • To offer the best greenhouse technologies within a wide range of integrated services.
  • To provide support services to minimize risks related to the introduction of new technologies by reducing learning curves related to the mastering of this technology.


1965 IRRIGATION St-Thomas is incorporated. Main activities: sale of irrigation systems and agricultural equipment specialist.
1968 Diversification into the greenhouse manufacturing industry.
1970 Major innovation: First installation of greenhouses with double, inflated polyethylene in Canada.
1971 Construction of the first complex of gutter connected greenhouses in Quebec.
1972 : Introduction to Canada of aluminium fasteners dedicated to securing greenhouse polyethylene films.
1981 St. Thomas Irrigation Inc. changes its name and becomes INDUSTRIES HARNOIS INC. to better reflect its diversification.
1982 First company in North America to use tubular steel in the manufacturing of oval arches for greenhouses.
1986 Start up of the business in the U.S.
1993 Start up of the business in Mexico.
1997 Design and manufacturing of a greenhouse with on-site curved glass cover.
1999 Introduction of 90 mm oval tube.
2000 Introduction of Galvalume® treated tubing, with protective clear coating.
2001 Start up of the business in Japan
2002 Design and implementation of a gutter connected greenhouse specifically developed for the Mexican market: the MX2000
2005 Launch of the Luminosa greenhouse that is a wider and higher updated version of the MX2000 greenhouse. Productivity within the Luminosa is optimized and users can obtain higher yields than what is common on the market.
Patrice and Yanick Harnois take over from their predecessors to ensure the continuity of the company.
2006 Launch of the high tunnel named TunnelPro
Marketing of an optimized Luminosa, 11 m wide and 6 m high