The training area (Space I) in the house gets very hot in summer and we got some airconditioning on Friday. This made a huge difference. We installed two 18000 BTU units Samsung Mid wall Smartinverter units which seems to have done the trick.
The company that installed it was GNAir (http://www.gnair.co.za/) – I could really recommend them. They committed to having the system in on time and delivered, despite some inevitable hurdles. Very professional – thanks Roelof and team.
Also a nice panorama of the training area (mouse over for effect):