What incentives can businesses, public institutions and industrial facilities receive?  

The Federal ecoENERGY Program gives these eligible organizations grant worth of 25% project cost; in Ontario, these organizations can receive the same percentage of the grant from the Provincial Government. For details, please browse
http://ecoaction.gc.ca/Conner/heat-chauffage/index-eng.cfm (Federal Government)
http://www.energy.gov.on.ca/index.cfm?fuseaction=conservation.osthi_faqs (Ontario Government)
Municipalities and local environmental organizations may have additional programs. Ask your contractor for more information.