I think I have solved most of the problems now. I was having trouble with making daylight calculations inside the room after importing the geometry as a 3ds. from Rhino. Some of the problem was that the surfaces not where facing the right direction in Ecotect after importing.
Then there was also a scaling problems because Rhino and Ecotect not where using the same measurement but that is also solved now.
But will also try what you are saying about the different in surfaces and solids.