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Twinning Methods: The Ultimate in Rooftop HVAC Redundancy

Twinning allows multiple units to function together on a common supply and return duct shaft.

A diagram of two rooftop units simultaneously serving common supply and return shafts, demonstrating 'twinning'
November 01, 2019

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Twinning refers to the application where more than one rooftop unit is serving a shared supply and return duct. By operating units in unison, twinned systems can provide higher capacity and/or some system redundancy. Twinned systems are typically sized so all units must be operating to meet the worst-case demand of the building.

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