Is this possible? Obviously I could just run the line into the drain going to the septic tank, but the unit is under my house. I wouldn't want to run the line, without a P trap, to keep sewage gas from being in my crawl space, but I wouldn't have enough head pressure to push water through the P trap.

Somebody 'splain it to me. If I don't do something, before next summer, I might as well plant a bog garden where it runs out from under the house.

I’m 99% sure my house dumps the condensation into the septic.

Slab on grade, no exterior pipes/dumps dribbling out water thus I assume it’s going to the septic.

Use a condensate pump to pump the water outside

I would pipe it outside. A p trap is asking for a blockage. You can bury a 5 Gallon bucket with drain hole drilled in the bottom and sides and fill in around it with gravel.

Coldtrail has the right idea, also leave the lid on the bucket so leaves and grass clippings don't get in it

You would cut In a T to your main drain, tie in your condensate with a pee trap, & add a trap primer. Otherwise your trap will dry out in the winter. FYI, if you do this, don’t double trap it by having one at the unit. Much preferred to slope or pump outside for residential applications.

This, all day. Make sure you have good slope without a belly sag in the run. Helps reduce algea build up when water flows good.

I would not tie it in. I dig a hole where the condensation pipe terminates, about the size of a 3 gallon bucket, and fill it with gravel. On one house where the architect had detailed instructions, we did this where the hole was 2x2x2, filled with gravel to 8” below grade, added geo textile over the top and back filled the rest with top soil.

Everone ive ever seen is just run outside

Them elephant ear and banana trees love that stuff

Let mine just drip

No way I'd tie it into septic. If it has to go subsurface, do as recommended and put it into a gravel lined hole.

Chicken water

Plant water melons they will love it. Hole diggers 6 inch pipe 3-4 ft long. Settle it in fill with gravel. Deeper is better.

My cottontail rabbits drink from mine all the time.

That's what I do

Mine terminates right at my back steps. There's no good place to move it to. I tried the bucket and pea gravel. Ground won't perk in that exact spot. It terminates right on top of an old driveway. I guess I coujld extend it out in the yard, and try the bucket again. Currently, I've got a mudhole beside my back steps. I've got to do something. Tying it in to the septic sounds like a bad idea.

Ours is tied into our septic, but our blower is on the bottom floor in the middle of the house.

I built an oversized - P-trap for the Winter (I add water periodically in the Winter), to prevent sewage gases from entering the house. Periodically, I add a chlorine tablet to the drain to keep it clean as well as the air handler.

I wouldnt tie it into septic. I don’t even like the idea of having to worry about sewage gases coming through the ac drain line. Plus, I saw someone tie into their homes drain lines….sewer line stopped up and cause sewage to back into the AC unit. What a mess.

I’d either reroute it to another side of the house or if its hard to get enough fall, I’d install a condensate pump and pump it to somewhere else.

Use a piece of septic tank field line. Cover it with gravel like a septic line. 8 ft piece should hold all the water.