How do I get rid of old and musty odors inside the house?

Hello All,
I bought a house that was built in 1988 last year. It's a split-level home that has a basement-like level. The basement exterior has been water-proofed to prevent the water from getting in.
All carpets were replaced, hardwood-floor was installed in most area, and the house was repainted inside out, but I still smell the old-musty odor in the bedroom, the living room and some other rooms. There were no signs of mold or mildew anywhere around the house.
How do i get rid of this musty-smelly odors and replace it with a new-and-fresh odor?
I prefer to use natural-home-made ingredients if possible.
Could anyone advise?
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