How to use the temperature difference between outdoor and indoor air to reset Ideal Loads Setpoints in Energyplus

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Use a simple EnergyPlus EMS Program

You'll need:

1. A sensor that reads the outdoor air temperature
2. A sensor that reads the zone mean air temperature
3. An actuator that controls the cooling temperature setpoint schedule
4. An actuator that controls the heating temperature setpoint schedule
5. A program control object, probably set to run
6. A program object that reads the two sensors and modifies the setpoint schedule via actuator

```

EnergyManagementSystem:Sensor,
  OutdoorTempC,                      !- Name
  Site,          !- Output:Variable or Output:Meter Index Key Name
  Site Outdoor Air Drybulb Temperature;  !- Output:Variable or Output:Meter Name    

EnergyManagementSystem:Sensor,
  ZoneTempC,                      !- Name
  My_Zone_Name,          !- Output:Variable or Output:Meter Index Key Name
  Zone Mean Air Temperature;  !- Output:Variable or Output:Meter Name

EnergyManagementSystem:Actuator,
  HtgSetPtSchAct,           !- Name
  Heating_Schedule_Name,             !- Actuated Component Unique Name
  Schedule:Compact,       !- Actuated Component Type
  Schedule Value;          !- Actuated Component Control Type

EnergyManagementSystem:Actuator,
  ClgSetPtSchAct,           !- Name
  Cooling_Schedule_Name,             !- Actuated Component Unique Name
  Schedule:Compact,       !- Actuated Component Type
  Schedule Value;          !- Actuated Component Control Type

EnergyManagementSystem:ProgramCallingManager,
  ChangeSetpointsProgramManager,  !- Name
  BeginTimestepBeforePredictor,  !- EnergyPlus Model Calling Point
  ChangeSetpointsProgram;  !- Program Name 1

EnergyManagementSystem:Program,
  ChangeSetpointsProgram,  !- Name
  ...Logic goes here...
  SET HtgSetPtSchAct = whatever,
  SET ClgSetPtSchAct = whatever;