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There are multiple ways to consider heating/cooling only and you mentioned a few. If you check the ".html" report file which shows annual energy end uses, you will notice that cooling energy (under district cooling) is actually zero. So I believe that you need to consider reporting different output variables that will better reflect the energy use as shown below. The "Zone Ideal Loads Supply Air Total Cooling Energy" output variable is the district cooling energy consumed by the ideal loads system “cooling coil” to cool and dehumidify the supply air. After adding this variable, you should see that cooling is always zero based on your attempt to force cooling to be zero. You can read more about the different output variables for Ideal air load systems in case you have outdoor air/heat recovery systems.

Output:Variable,
    *,                       !- Key Value
    Zone Ideal Loads Supply Air Total Heating Energy ,  !- Variable Name
    Hourly;                  !- Reporting Frequency

Output:Variable,
    *,                       !- Key Value
    Zone Ideal Loads Supply Air Total Cooling Energy ,  !- Variable Name
    Hourly;                  !- Reporting Frequency

There are multiple ways to consider heating/cooling only and you mentioned a few. If you check the ".html" report file which shows annual energy end uses, you will notice that cooling energy (under district cooling) is actually zero. So I believe that you need to consider reporting different output variables that will better reflect the energy use as shown below. The "Zone Ideal Loads Supply Air Total Cooling Energy" output variable is the district cooling energy consumed by the ideal loads system “cooling coil” to cool and dehumidify the supply air. After adding this variable, you should see that cooling is always zero based on your attempt to force cooling to be zero. You can read more about the different output variables for Ideal air load systems systems in case you have outdoor air/heat recovery systems.

Output:Variable,
    *,                       !- Key Value
    Zone Ideal Loads Supply Air Total Heating Energy ,  !- Variable Name
    Hourly;                  !- Reporting Frequency

Output:Variable,
    *,                       !- Key Value
    Zone Ideal Loads Supply Air Total Cooling Energy ,  !- Variable Name
    Hourly;                  !- Reporting Frequency

There are multiple ways to consider heating/cooling only and you mentioned a few. If you check the ".html" report file which shows annual energy end uses, you will notice that cooling energy (under district cooling) is actually zero. So I believe that you need to consider reporting different output variables that will better reflect the energy use as shown below. The "Zone Ideal Loads Supply Air Total Cooling Energy" output variable is the district cooling energy consumed by the ideal loads system “cooling coil” to cool and dehumidify the supply air. After adding this variable, you should see that cooling is always zero based on your attempt to force cooling to be zero. You can read more about the different output variables for Ideal air load systems and its different output variables (You should pay attention to the output variables in case you have outdoor air/heat recovery systems. systems).

Output:Variable,
    *,                       !- Key Value
    Zone Ideal Loads Supply Air Total Heating Energy ,  !- Variable Name
    Hourly;                  !- Reporting Frequency

Output:Variable,
    *,                       !- Key Value
    Zone Ideal Loads Supply Air Total Cooling Energy ,  !- Variable Name
    Hourly;                  !- Reporting Frequency