Expert Commercial HVAC Services serving Commercial, Industrial, and Multi-Unit Residential Building Owners, Property Managers and Contractors in Ontario for over 40 Years. Demand Air provides exceptional service to your commercial HVAC equipment to help you ensure maintenance of a comfortable climate for all of your building’s inhabitants. From commercial retail buildings, to large-scale industrial warehouses, and high-rise commercial and residential, Demand Air Commercial HVAC Technicians deliver exceptional service and expertise to complete your project on-time and within budget.