How to 'turn on' district heating and cooling outputs in IDF Editor for EnergyPlus

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Yes, include an Output:Variable for each output you want.

You can include the object Output:VariableDictionary and after a successful run, you will find a file eplusout.rdd that includes every variable that applies to your specific model. The IDF Editor will also parse this file automatically to help prepopulate choices for any Output:Variable. You can also refer to the I/O reference guide, every object (or almost) has an input section defining what each fields are, and also an Output section related to the Output:Variable that apply to the object and what they mean if needed to explain.

Here's the one for ZoneHVAC:IdealLoadsAirSystem