I have installed an Carrier Infinity Air Conditioner (2 ton) a couple of years ago. Since the installation, I noticed a lot of sweating on the plenum on the side coressponding to the ends of the coil inside the plenum. The sweating was so much that large beats of condensation would appear shortly after the air conditioner is turned on and would eventually drip down the side of the plenum.
I contacted the contractor who did not do anything and eventually contacted Carrier. They did a number of tests and moved the coil inside the plenum towards the centre (it was installed to one side of tbefore) That did not cure the proble. Condensation still appears. This summer, they are coming back but before I have to deal with them again, I would like to learn more about the issue and perhaps others experience in this area.