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We bought our home in Dec. 2014, ten year old house. It started making a rumbling noises, as though it was thundering outside, and it seems to happen in the evening. However, sometimes during the day. We had the entire heating and air system checked out. We also just had a new 80 gallon water heater installed in February 2015. We just can't seem to figure out what is causing this noise?

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    How long does it last? Is it louder in some areas? Do you have a sump pump? Does anything you do cause/influence the sound? – Tester101 Mar 7 '15 at 13:14
  • Sump pump or honey pot sump would be the first area I'd look at as well. – Pᴀᴜʟsᴛᴇʀ2 Mar 7 '15 at 16:05
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    Did the rumbling/noises happen before the new water heater was installed? – Alaska Man Mar 5 '17 at 5:04
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I recently experienced the same issue. We just found out what it was and had it fixed. Apparently, there is a pipe that sticks out of the house from the HVAC system underneath the house that releases water that is formed during the cooling and evaporation process. We found out we needed to have the trap (device that collects debris) checked and cleaned annually. Because the trap was full of debris, water couldn’t leak out of the HVAC system and out the pipe causing the build up of pressure in the HVAC system (cause of the rumbling noise underneath the house). Eventually what happened was, our central air unit had pressure problem and could barely pumped out any AC. Once we had the trap cleaned, ever thing started to work again and the noise went away.

  • Hello, and welcome to Stack Exchange. Thanks for the answer; keep 'em coming! – Daniel Griscom Jul 29 '18 at 21:41
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Sometimes it is air buildup in the water pipes, especially if your home uses hot water (radiant) heating system.

The air vents that are supposed to allow air in the heating system to escape are not working correctly, so there are pockets of air trapped throughout the piping system. Over time these air pockets accumulate and some sections of the pipes become water-less. When a gush of water is pushed into these "air" area, especially in vertical pipes, the water just falls right to the bottom like a hammer and creating these banging/rumbling noises. Once you solve the air-in-system problem, everything will be quiet.

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No, it's the husband & not the dog, can you cut back on the broccoli for once! I'd vote on it being the Water Heater & hopefully you're still alive, but it may need a new or non-defective nor damaged T&P valve...the water temperature may be set at maximum & this is very bad.

  • This was asked 2 years ago. Did we ever find out if it was the husband or the dog? I've got to know... – Lee Sam Apr 7 '17 at 5:11
  • Nope, no idea. But, for a now 12-year old house it can really only be the Water Heater or a quite large Sump Pump. About the only other thing would be Duct Work that didn't have anti-flex ridges put in or an animal using them as a roadway...a little too common & discernible to not recognize after a few instances. – Iggy Apr 7 '17 at 13:48
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I think you're going to have to track this down yourself. It could be anything from your heating system to train/truck noise. (In my case it's traffic, pkanes, and a heating-system mounting bracket thatught too be replaced with a noise-isiolating unit.)

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