When we moved in, popping and thumping sounds seemed to be coming from the attic. We thought it was squirrels because we have a lot of squirrels and it sounded like little feet running and chasing. We called an exterminator and he saw no signs. The sound only occurred at night because that's when we ran the showers and dishwasher - so it seemed logical the squirrels were coming in for the warm dry attic. I finally put a game camera in the attic but got no results - not even a mouse. Then I was in the garage one day when the clothes were being washed. The washing machine was louder than the noise in the house, but in the garage near the water heater I could hear the bubbling. Mystery solved!
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