About Us

Conserval is the global market leader in the renewable energy sector we created; Solar Air Heating. Since our founder John Hollick invented the transpired solar collector (branded as “SolarWall heating”), Conserval has designed and manufactured thousands of SolarWall® air heating systems worldwide for commercial and industrial buildings–eliminating tens of thousands of tons of CO2 emissions each and every year!

There are over 5 million square feet of SolarWall air heating systems on 6 continents across the globe, from Alaska to the South Pole. These systems are helping businesses and municipalities achieve their energy goals and reduce their carbon footprint.

The SolarWall technology has won numerous awards from organizations such as Popular Science, R&D 100, Renewable Energy World, the Canadian Solar Industries Association, Readers’ Choice Awards, the Toronto Construction Association, and others. The SolarWall technology has also been honored by the United States Department of Energy, Natural Resources Canada, and the American Society of Mechanical Engineers as being one of the best energy inventions.

Over the past three decades, Conserval engineers have continued to improve upon the SolarWall technology to meet each project’s design and energy requirements. The result has been a full suite of SolarWall technologies including SolarWall 2-Stage, SolarDuct® Rooftop Heating, PV/T and NightSolar systems.

Since its inception, SolarWall systems have been regularly tested by third-party laboratories so that our clients can depend on their outstanding performance. And as no SolarWall project is the same, our sales and engineering teams are experienced to support your SolarWall project through the stages of feasibility study, business proposal, design consultation, tender process, installation and start-up.

With more than 30 years of project design and management experience – and countless awards – we understand what it takes to make every SolarWall project a shining success!

Conserval has also established The SolarWall Foundation a Canadian solar charity, to support Conserval’s vision of incorporating solar heating on schools and non-profit buildings to enable children and others to experience and learn about the benefits of renewable thermal heating.


Toronto Transit Commission (TTC) McNicoll Bus Garage receives the Judges Award for the Metal Architecture Design Awards. The project was recognized for the innovative application of the SolarWall® technology on the building facade to generate 5% renewable energy onsite.


Conserval Engineering, Conserval Systems, and SolarWall Europe are successfully certified to the new ISO 9001:2015 Standard.


SolarWall® project by KMA Architects for Peel Regional Paramedic Service Station named Solar Thermal Project of the Year by the Canadian Solar Industries Association (CanSIA)


SolarWall® inventor John Hollick honored by American Society of Mechanical Engineers (ASME) as one of the best inventions and inventors of the past two centuries.


Conserval Engineering, Conserval Systems, and SolarWall Europe are certified to the ISO 9001:2005 Standard. ASHRAE Technology Award for new NREL facility in Colorado for its use of innovative technology, including an 8,600 ft2 SolarWall® system


Hood River Middle School (located in Oregon, USA), which includes a hybrid SolarWall® PV/T system, named as one of American Institute of Architects (AIA) Top Ten Green Projects of 2012 Bluenose Academy in Nova Scotia wins the Solar Thermal Project of the Year Award from the Canadian Solar Industries Association for its use of the SolarWall® technology and solar water heating.


Conserval Engineering and SolarWall Europe are named the recipient of a 2011 SME Canada-France award.


Owens Corning wins Solar Thermal Project of the Year Award by the Canadian Solar Industries Association ( CanSIA ) for their two SolarWall® systems at their Toronto manufacturing facility. SolarWall® PV/T technology wins Renewable Energy World Award for Best Building Integrated Technology


Conserval Systems wins 2009 Technology Award for SolarWall® technology, and receives commendation from NY Governor Patterson and the State Assembly


Conserval’s SolarDuct® and SolarDuct® PV/T modular rooftop solar systems win the First Place Reader’s Choice Award from Metal Construction News SolarWall technology wins World Green Business Award under the category of “Best Use of Product Design” for a Prologis Sainsbury Distribution Centre in Northampton, England


Greater Toronto Airport Authority and architect Carol Kleinfeldt of KMA win the 2007 Solar Thermal Project of the Year Award by the Canadian Solar Industries Association.


Over 1000 SolarWall systems installed in 25 countries


Conserval opens distribution in over 10 countries throughout Europe, and in Japan


Conserval invited by Japanese government to display SolarWall technology at Kyoto climate change conference


Bombardier installs the world’s largest solar air heating system in Montreal with over 100,000 square feet of SolarWall collectors.


SolarWall technology receives awards from Popular Science, R&D Magazine, Natural Resources Canada, the Manning Awards, Toronto Construction Association, and the Swiss Solar Prize.


United States Department of Energy rates the SolarWall transpired solar collector in the top 2% of energy inventions


Conserval Systems opens in Buffalo, NY


First of seven large SolarWall installations completed for Ford Motor Company


Conserval begins focusing on industrial energy projects and solar heating; develops the original SolarWall air heating system


Conserval Engineering, Inc. is formed


John Hollick, P.Eng., inventor of the SolarWall tranpired collector technology, CEO of Conserval Engineering Inc.

Our Offices

Conserval Engineering Inc.
200 Wildcat Road
Toronto, Ontario M3J 2N5
Phone: (416) 661-7057

United States
Conserval Systems Inc.
10 John James Audubon Pkwy Ste 110
Amherst Ny 14228
Phone: (1-877) 768-4328

Conserval Europe Sarl.
66 Avenue des Champs Elysees
75008 Paris, France
Phone: +33 (0) 1 46 99 17 07