I am a realtor and also manage rental property. We purchased the OdorFree to eliminate odors in the condominiums we rent near the University of Tennessee. It is amazing how effective the unit is at getting rid of smoke odor, pet odor, and just about anything else!
I recently sold a 4200 square foot home that had a stale, musty odor that actually came from underneath. All it took was one day in the house and one day in the crawl space, and odor was gone. All things being equal, a property that smells fresh sells a lot faster.