Over the winter, during our construction, we added individually controlled heating and cooling units to each guest room. They are high efficiency Daikin ductless units. We are told they are the best you can get currently.
Each guestroom has its own control, giving you the ability to have the unit on or off, and set the temperature to what you want. the only limit is that someone cannot cool a room, while another is heated. this is a case the experts deemed unlikely.
The Grand Victorian Ballroom has what they call a ducted ductless system that keeps it lovely and cool in the summer for the events we hold.