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Hi, I've got an existing Hevacomp model which works fine in CAD input. But I need to update the DXFs and change a couple of zones. When I bring in the new DXF all the CAD rooms on the floor disappear. The rooms are still there, because they show up…

Good Afternoon All, Using Hevacomp design database (and CAD input) I have built a large 4 storey 'complex' building from the 1700's containing around 200 rooms, to get some idea of heat losses throughout the building. However, now the model has been…