Description:

Deadband is the difference between the zone heating and cooling temperature setpoints. Widening the zone temperature deadband of the HVAC distribution system (e.g., piping, ductwork, terminal units) will result in measurable energy savings at the HVAC central equipment (e.g., boilers, chillers, air handlers). It’s common for HVAC systems to operate with little to no deadband, meaning that there is one temperature setpoint during winter and summer seasons.

Specific zone control energy conservation modifications will vary by HVAC system type and the specific needs and capabilities of each facility. It’s important to integrate the controls of both the central equipment and the distribution system for maximum energy efficiency and occupant comfort.

Special Considerations

• Widening the deadband with pneumatic controls will likely involve replacing the thermostats with ‘zero energy band’-type thermostats that have an adjustable deadband and manually setting the deadband at each thermostat. If a system already has direct digital controls at the distribution level, widening the deadband can be as simple as a global change to the heating and cooling setpoints made from the main operator workstation.

Estimates for this measure come from the Department of Energy's Advanced Energy Retrofit Guide.