Wireless Building Automation Systems (BAS)

I was interested to find this new technology from EnOcean that provides wireless building automation systems.  This could be big for the emerging market of existing building green retrofits.   For example, it could now be easier to retrofit an existing hotel to wirelessly turn off the lights and turn down the A/C in unoccupied rooms.  Perhaps urban or higher security areas will 'wait and see' if there are any security concerns from using wireless technology for this purpose.  Could a hacker turn off the A/C in a larger building that uses this technology?  I'm sure these concerns are being addressed, but it will interesting to see this technology develop as we might see a variety of building performance data being transmitted wirelessly in the future.  Check out EnOcean.