My house is 20 years old, and previously had a Geo Water Furnace. Had it replaced last year, and all is great except for a smoky, or musty odor. I do not smoke and house is exceptionally clean, and can't understand this odor. My furnace vents have never been cleaned, registers are all clean, and wondering how often furnace vents should be cleaned by a professional. Any suggestions? Also, furnace is quite noisy, a definite whine, which my installer says is when the compressor kicks on. Never noticed it with my Water Furnace. Thanks for any input you may have.