condensation is the result of a condition, it does not leak. Where exactly are you seeing condensation? Is your AC cooling? What are outside conditions when you see condensation? When was your AC system last serviced/PM?

IMO

Sounds like a blocked condensate drain line.

Water Hanson, nope. I live on the TX coast ... very humid most of the time. I never see "water pooling by the condensor unit" unless the one time thus far when the condensate drain was clogged and the air handler/evaporator coil unit in the attic was overflowing and dripping it into the safety catch-pan which has an external drain port at the eaves by the outside (condensor) ... purposely set up that way as a visual indication that the normal drain route is clogged. The condensate water otherwise drains into the household sewer via a line into a toilet vent stack in the attic and is not seen dripping or pooling anywhere.

The condensate water otherwise drains into the household sewer via a line into a toilet vent stack in the attic and is not seen dripping or pooling anywhere.

This is not a good place to drain AC condensate, for the simple reason the trap on a 3/4 inch typical AC condensate line can run dry during the parts of the year the AC isn't used.

Once that trap goes dry, you have the potential of sucking sewer gas into your HVAC system and dispersing it thru the home.

Heaven forbid there is no trap on that condensate line. Good way to make yourself and other occupants of the house sick.

Hasn't been a problem with that (yet) in 15 years. There is a trap on the line. It's a heat pump so is run year-round to the extent that heating is necessary. Perhaps defrost cycles generate enough condensate to keep the trap from going dry? The house has an aerobic septic system, does that have any relevance vs. a municipal sewer connection?

I doubt it. When a heat pump enters defrost it is to defrost the out door coil. While the heat pump is in defrost it could generate some condensate, but typically winters are dry times of the year so any condensate produced during a heat pump defrost cycle would be no where near that of what is produced when running in normal AC mode.

I'm not a plumber so I am not sure what an aerobic septic system is, but I do know that any sewer system will produce sewer gas. Not anything you want to breathe in any amount regardless how small.

Nearly ever AC trap I come across in the winter (3/4 inch pvc trap) y that isn't trapped some where else further down stream is bone dry. I live in one of the most humid environments you can imagine. With that said, double trapping is not a good idea either as it can cause drainage problems, gurgling noises and so on.

The next winter you get sick, flu etc. You may remember this conversation... an ounce of prevention has always been worth a pound of cure.

I had flu in 1986. The next instance was a very mild case in May of this year. So that's 14 years in this house until that instance. I'm the only occupant. I didn't design the A/C system here, didn't direct construction of the house, it was a year old when I bought it. I'll instruct the installer of the replacement system, whenever that occurs, to find some other way to handle the condensate. I know where is Katy TX. I'm maybe an hr from there.