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Check under your kitchen and bathroom cabinets where the plumbing penetrates the wall. There is usually a relatively large gap around the pipes. The pipes need to move some and they heat and cool, so some clearance is needed.
Even though most plumbing is on an interior wall, there are still possible air leaks from the basement, crawl space or attic into your bathroom or kitchen through this gap. Use some flexible rope caulk to fill the gaps between the pipes and the wall. This can also help to keep insects, that get into the walls through crack in the house exterior, from getting out into your rooms.