- We use a ton of empirical time series data from the building to calibrate the model. - There's almost never a model. We build it from scratch in every case.

- We use a ton of empirical time series data from the building to calibrate the model. - There's almost never a model. We build it from scratch in every case. - We have a highly customized fork of EnergyPlus. They are all difficult to use in our experience, but EnergyPlus allows us to get the detail required for our needs.