I have a Carrier Infinity system installed in a 2200 sq. ft. cape cod style house. I have no basement. There is one main supply trunk that runs length of house with 6" round ducts going to 4" x 12" registers coming off either in ceiling for first floor or floor for second floor. There are 9 ducts on first floor and 3 on second floor. Thermostat is in family room on first floor. Upstairs bedrooms are always warmer in both summer and winter by about 4-5 degrees. I have read alot on here about the Carrier zoning. My question is since I only have one main trunk how would zoning be accomplished? Do they have dampers that can go on each outlet? If so can control be run through duct back to air handler or do you have to run separetly. This seems like it would cause a lot of damage. I also assume that a thermostat would be put on second floor.
Currently I am running system in comfort mode for better dehumidication. Would I get more even temperatures if I ran in efficiency to get more airflow?
Thanks for any info you can give me.