Create a level with the same elevation for each of your floors.
Use these to draw your cables and ducts.

This is a good idea.

I'll try this+polyline.

Thanks

Have you tried the Create polylines button, in between the Create rooms button and the Create dimensions button?
Also available under the Plans option.

I'll try, thanks.

Same problem here on a XPS13 (Skylake processor), so not exotic GPU, pure Intel, on Fedora 23 and 24, 64 bit.

I'm not sure if the same Ubuntu's problem affect Fedora, too, but in the last release the 3D standard is not enough and MAD/ATI is not going to provide a proprietary driver for linux ...

I have already built the house model.

Also in this forum I found how to add the power plugs (with a custom design).

I would like to draw the tracks for the ethernet cables, thermostats, phone cables, TV and so on. It is 3D matter as the house has more then a floor.

I don't know how to achieve it ...