I have a 1.5 year old geothermal system with a Tranquility 22 heat pump. I have a 2 story house and it is all run on a single zone. In the summer the 2nd floor doesn't get as cool as I want with a given setpoint on the thermostat, and I am looking into being able to set 2 zones. I found http://www.arzelzoning.com/ which seems to have some interesting products to allow for zoning, but I am unclear on how well it would interact with my system. The system I have has an intelligent thermostat which has lots of detailed information on the system, and I wouldn't want to lose that. I like the idea of the simplicity of having a pneumatic method of closing off the vents I don't need to heat or cool. But I figure whatever zoning system I use, it has to be smart enough to decrease the fan speed if only half of the vents are open, so that the pressure isn't higher than designed. I tried to find some climatemaster branded solution, but I didn't see anything. Can someone give me direction on this?