I recently purchased a home that had been remodeled by the previous owners. They installed a new furnace and A/C unit in the basement crawlspace. Initially, the crawlspace was dry and everything seemed fine.

Now that it's warmer where I live, i've noticed heavy water build up coming from the A/C unit condensation line which is just a small tube that drains into the crawl space. This leads to water collecting at a low point (where there is no drain) and building up. This is coming both from a plastic tube in a plug in the drain pan and an unplugged outplet in the drain pan.

I've cleaned up the large standing water with a shop vac, and i'm catching the condensate in a bucket and emptying it daily. While this stops most of the water build up, i'd prefer a more automated solution.

The only nearby drain in the crawlspace is a sump pit.

  1. Is this a normal setup? I'm surprised this passed inspection if it's not.
  2. Should I have my A/C unit checked out? or is this just a drainage issue?
  3. Any recommendations on how to solve this? I'm not above PVCing this to the sump if that's an acceptable solution.

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  • Is routing the condensate drain to the sump an option for you? Jun 15, 2021 at 4:22
  • When you do sort out where to plumb the condensate, tighten (or seal with new Teflon tape) that white barbed fitting the hose attaches to so it doesn’t leak. Years of that can cause corrosion of the metal housing.
    – Tim B
    Jun 15, 2021 at 10:50
  • I'm okay with routing to the sump. I would need to double check about any local ordinances though. @Timb thanks for the note about taking care of that leak. Will do! Jun 15, 2021 at 15:16

1 Answer 1


Draining to the sump pit is a common choice.

Another method is to use a small, automatic condensate pump to lift the water up high enough that it can be directed to another drain.

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