What should be included

What should be included/ not included in the model?
 It should be possible to decide the energy demand of the house in the model, either by given reference loads, or by choosing a specific energy demand of the house. This should be separated into space heating and domestic hot water.  When the model itself calculates the losses of the house it can be misleading and not sufficient for the actual house. This can be one boundary of the project. Alternatively, typical houses are used in typical climates, both preset in the model.