I'm planning on building in Melbourne Beach Fl. Very hot and humid.... Was going to build using CMU blocks. Now obviously that isn't a very good wall insulator by itself. I was thinking of having the GC do a 2x4 wall mounted to the CMU blocks interior than have closed cell spray foam used. Any opinions? He originally wanted to do CMU with foam injected into the block and rigid board installed over furry strips. I had this done in a previous house and didn't like the rigin board cause the electricians and plumbers chopped it all up and I felt it lost its insulating qualities. Any suggestions are greatly appreciated.