Is is from the shifting if the house on the foundation. This is caused by many factors like wind or settling but mostly it is due to the change in temperatures. When the weather gets cooler or warmer it causes the materials that make up the building to warm or cool at different rates and expand or contract. The outside of the house will cool or warm faster than the inside and expand or contract against the inside. Those cracking sounds are from that.
Much of home construction uses wood, from the framing to the sub-floors and walls and in older homes the flooring itself. If it’s new construction the house is still settling. If it’s old construction, the joints may be a little loose from years of thermal expand and contraction.
You rarely hear this in buildings that have codes to make them out of concrete.
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