From the CT-100 Plus Users Guide:
Swing (HVAC Cycling Rate)
This feature enables you to set the acceptable variance in
temperature between the CT100’s setting and the current room
temperature before the heating or cooling system will turn on. The
Swing range can be from 0.5 to 4.0F (.25 to 2C). For example, if Swing
is set to 2.0°F and the CT100 is set to 70°F target temperature, the
heat cycle will start when the room temperature drops to 68°F.
Similarly, the cooling system will start when the room temperature
increases to 72°F. The HVAC runs until the room reaches the target
temperature, and then shuts off
If I am understanding this correctly, it means it will switch from auto/heat to auto/cool at 72 degrees F and from auto/cool to auto/heat at 68 degrees F.
I currently have a CT-100 and it appears to work this way except it does it very very slowly. That's actually why was checking to see if any other zwave thermostat could do this.
You may rest assured that will be the FIRST thing I check when I get it installed.