Check your return temp and then check your supply temp a the register closest to the air handler/furnace. My guess is you have hot air infiltrating the return. Another guess on the no condensation from drain is that the condensation is lifting off the coil due to static pressure.
Quote:
Originally Posted by Fischer_76_911S
Just a thought. Get a piece of plexiglass cut the same size as the cover for the air handler. Run the system and watch what is happening. The condensate might be getting sucked back into the airstream and added to your house instead of flowing down the coil and into the pan.
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Was going to suggest the plexi cover too. You'll be able to see moisture forming on the coil as the unit runs. If it's not making it to the drain, it's probably lifting. If it's lifting the only way I can think of to verify would be to remove one of the metal covers for the coil and put plexi in place. Do you know if it is an A coil or N coil?