Its got glass sides and clear plastic roof .. the floor is slatted and theres gaps for breeze.
But its too dry in there - the plants handle is .. but Id like it more humid .. any ideas?
Add a water feature.
Seriously, even a big bowl of water near the plants may be enough but a fountain would work better.
Alternatively you could fill a tray, something that will hold water and at least 2 inches deep, with decorative rocks and water and sit the plants in pots on top so they are standing on the rocks but not quite in the water all the time.