I have an IP in QLD and currently has a split system to the main living area and also the master bedroom. The tenants have requested air con in the remaining 3 bedrooms and am considering different options. I have come across multi head split systems and also cassette type systems (i suppose a separate split could also be place in each of the rooms). What are the pro's and cons of each of the units? Is there anything I need to watch out for? Thanks.