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I found a solution that provides the following on the supply side of AirLoopHVAC:

  1. hot gas reheat for dehumidification
  2. variable airflow
  3. primary DX heating and cooling coils
  4. an additional supplementary heating coil

I achieved this by doing the following:

Created AirLoopHVAC:UnitarySystem with: - DX Heating Coil - DX Cooling Coil - Coil:Heating:Desuperheater for hot gas reheat - control type is "SetPoint" - if control type is "Load" fans do not operate at variable air volume

Added a Coil:Heating:Fuel to the outlet node of the AirLoopHVAC:UnitarySystem. The Coil:Heating:Fuel is also setpoint controlled.