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There are basically two possible causes expansion and contraction of the heating system (either air ducts or water pipes) or water hammers. Water hammers can be greatly reduced through the use of dead end pipes that contain air, usually located in the vicinity of faucets. There are also special pipe pieces that can be put in place. Contraction and expansion is a much tougher issue in an existing structure. Basically you have to either pad or lubricate any place that the ducts or pipes are touching joists or walls. You may be able to reduce the speed of heating and cooling and reduce some of the popping through some settings on the furnace. Good luck!

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Q: How can you fix the banging noise in the wall?
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