A/C air distributor is constantly freezing over. Why?

your distributor is your air handler. your outside fan unit is your condenser. the sweat is condensation. your gurgling noise is your condensate drain line and or your liquid line or txv issue. your cooling grids is your evaporative coil. your cold air building up is not building up it is simply not moving over the coil with enough volume and velocity. your new stat is probably not wired correctly and not set up correctly. and will it run your type system correctly. and if your coils were filthy when the pressures were checked it was a waste of time without proper airflow. something electronic is failing or cutting in and out, or your fan motor is bad and not pulling enough air some times. if the coil is iced up turn on the heat pump which will warm the coil in the air handler and you have to pull off the big pieces as they release. and put a shop vac on your drain line, and pour some vinegar dow n your drainline. and the evap coil will always be wet when cooling it is how the condensation is removed, unless you leave the fan set to on during cooling then you just put it back in the airflow. and if your coil was that filthy, you are not changing your filter as you should, which should be a cheap throwaway if you dont have a high cfm media filter or similar, not a fifteen dollar restrictive filter, ask your good ac guy about static pressures. i say good ac guy because you need to find one, and also have him maintenance the equip twice a year which you are also not doing. its a machine, it needs qualified maintenance. EDIT sorry didnt mean to sound like a jerk. and extremely sorry youre at the mercy of the apt maint guy.