Commercial Energy Systems

All-Air Central Multizone


The requirements of different zones are met by zone thermostats controlling dampers mixing cold and warm air at the central air handler. The mixed air is delivered in a single duct going to each zone. Return air is handled in a conventional fashion with no attempt to segregate zones.


The multi-zone advantages are:

  • Factory built air handler, complete with zone dampers
  • Good temperature control in each zone
  • Ducts are the only component outside the apparatus room
  • Ease of control

The multi-zone disadvantages are:

  • Need for many individual ducts, limiting the number of zones
  • High energy consumption
  • Difficulty in applying an economizer cycle.

Links to Related Topics

Indoor Air Quality
Outside Air Control
Central Plant System
Central (or Built-Up) System
All-Air Central Systems
All-Air Central Reheat Systems
All-Air Central Dual Duct
All-Air Rooftop
Air-Water Central Systems
All Water Central Systems
Two Pipe System
Three Pipe System
Four Pipe System