Multizone to Variable Volume Control Retrofit  

Education Type: 
1 Hour
Professional Development Hours: 
1.0 PDH
Sponsored by: 

Environmental Security Technology Certification Program (ESTCP)


Multizone air handling units are older units that are still prevalent in the DoD. This retrofit converts a pre-existing constant volume multizone system to a variable volume (MZ-VV) multizone. The technique makes changes in instrumentation and uses a novel control scheme to reduce energy consumption by reducing simultaneous heating and cooling and excess airflow to satisfied spaces. The retrofit is significantly less expensive and less disruptive than a full system change-out (to VAV) that would require demolition and installation of ductwork and terminal units. Typical multizone configurations and implementing the retrofit will be discussed. Resources that are available for technical transfer of the retrofit will be shown as well.


Chris Battisti, CERL

Learning Objectives

Upon completing this course, you will:

  • Understand multizone operation issues;​
  • Understand the multizone controls retrofit approach​;
  • Identify retrofit candidates and potential savings​; and
  • Describe available retrofit resources.​​
Federal Agencies and Facility Criteria: