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Demand Control Ventilation

Demand Control Ventilation


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A proven way to supply the optimum amount of fresh air based on occupancy level

The amount of fresh air ventilation in many buildings is maintained at a constant level for peak occupancy, regardless of the actual number of people. During lower occupancy periods, over-ventilation results in wasted electricity and money. Demand Control Ventilation (DCV) ensures the optimum amount of fresh air based on occupancy level, reducing operating costs and increasing comfort.

DCV should be considered for any building over 10,000 square feet, especially where there are multiple zones or variations in hourly occupancy level. It is not uncommon to attain 20 to 30 per cent electricity savings with a DCV system with paybacks usually ranging from 12 to 36 months. What’s more, DCV puts less demand on your HVAC system and can improve the marketability of your building.


Monitor CO2 levels and control dampers accordingly

People exhale carbon dioxide (CO2) at predictable levels, making CO2 a useful indicator of a room's occupancy-based ventilation needs. DCV uses CO2 sensors to take frequent measurements in a space and adjust ventilation dampers to reach desired CO2 levels. As occupancy goes up, more outdoor fresh air is brought in. When occupancy falls, less outdoor air is brought in. These sensors save energy and money by ensuring just the right amount of ventilation air to satisfy occupant needs.


Which sectors can benefit the most?

Buildings with variable occupancy patterns can all benefit from DCV, including:

  • retail outlets
  • classrooms and gymnasiums
  • offices and meeting rooms
  • auditoriums and theatres
  • fitness centres
  • food courts and dining halls
  • places of worship
  • waiting rooms
  • Consider a large fitness centre, which may be very busy during early mornings, lunch hours and evenings, but less busy mid-mornings and mid-afternoons. That’s where it really pays to adjust outside air to the occupancy levels of the facility.


    Savings can be significant

    With thousands of systems operating in Ontario and around the world, DCV is a low-risk and proven ventilation control strategy. Apart from lowered energy costs, a DCV system can improve indoor air quality and occupant comfort. The potential savings realized from implementing DCV depend on the volume of the space, the traffic patterns and the configuration of current HVAC systems.


    Our Energy Experts will help you get incentives up to 50% of project costs

    DCV projects qualify for incentive funding under the saveONenergy RETROFIT PROGRAM. Contact one of our Energy Experts to help you get started.

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     Join the RETROFIT PROGRAM leaders

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