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My air conditioner is in a crawl space in the 2nd floor. The condenser tray has a PVC drip line that comes down through the wall and meets up with a bathroom sink's drain immediately below the crawl space. When the A/C runs there's a small flow of water that you can barely here, but for 2 hours after the air conditioner stops there's a single drop of water about 1 per second and it's very loud. So, loud you can hear it in the bedroom next door even with the door shut. Is there anything I can do to reduce the sounds of the drips? I'm not sure if the drip is the 8 foot drop from the floor above in the wall or where the PVC finally connects to the drain line.

The green-painted PVC coming out of the wall is the drain line from the air conditioner above.

PVC drip line from air conditioner

Any thoughts?

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  • Thought: It's plumbed in on the wrong side of the trap, but that does not really relate to your problem... Thought 2: Plumbers putty is being misapplied here, but that doesn't relate to your problem either.
    – Ecnerwal
    Jul 23 at 21:59
  • Wrapping some 1/2 inch form around it should deaden the noise, if that is where noise coming from.
    – crip659
    Jul 23 at 22:05
  • I would identify exactly where the sound is coming from before proceeding. A stethoscope or a soft rubber tube, one end gently in the ear and the other end held against the pipe should help localize it. Jul 24 at 4:49
  • We get the drip sound in our guest bath sink. I like it , it means the AC drain is clear. Jul 24 at 18:11
  • Do you get sewer smell during winter months?
    – Kris
    Jul 25 at 1:53
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I'm guessing there's a P trap at the other end of that condensate pipe. if there's not it's installed incorrectly.

Installing that tee correctly would be a start. (the branch of a tee should always be near horizontal unless it is only a vent)

Replacing the two elbows with a collection of bends that feed into the (repositioned) tee would help too. the goal is for when the flow rate is low to have all the water flowing along the surface of the pipe.

the condensate pipe does who knows what inside the wall it might be making dripping sounds inside the wall too.

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