Capture Internal Heat - The polygon is made by assuming a minimum building balance point of 12.8 C and any conditions that are warmer than that will keep occupants comfortable (up to the comfort polygon). It is assumed that, above this building balance temperature, the building is free-running and occupants are able to open windows as they wish to keep conditions from overshooting the comfort polygon. Note that the default balance temperature of 12.8 C is fairly low and assumes a significant amount of internal heat from people, equipment. etc. Or the building as a well-insulated envelope to ensure what internal heat there is can leave the building slowly. This parameter component can be used to adjust the balance temperature.