RadonAway radon fans quickly became recognized in the radon industry for their superior effectiveness and reliability, and RadonAway rose to become the world's premier radon fan manufacturer. Soon the Spruce partners added to the RadonAway fan line a complete range of radon mitigation products and accessories from other manufacturers and RadonAway became a major supplier to the radon industry through its catalog and distributors. More recently, the RadonAway line has been expanded to include the AIRaider™ series of diffused bubble aeration systems for removal of radon in water, and the catalog has grown to include additional indoor air quality products.

Branching out further into the radon industry, in January 1999 Spruce acquired the first of its three radon testing laboratories. Under the name AccuStar Labs, these laboratories produce and analyze short-term radon test kits for use by professionals and homeowners and the electronic RadStar RS500 Continuous Radon Monitor. Recently, the AccuStar Lab in Lebanon, Pennsylvania, was rated the best radon testing laboratory in a blind study of 14 laboratories conducted by the Pennsylvania Department of Environmental Protection's Radon Division.

In 2004 Spruce launched HomeAire, which offers indoor air quality products, including the proprietary Active Dampness Control™ (ADC) System. The ADC System removes moisture from homes, reducing the likelihood of mildew and bacterial growth and insect infestation. Specializing in the proactive application of proven IAQ solutions to create a healthier indoor environment, HomeAire makes its products available through a nationwide network of trained dealers.

Spruce continues to research new technologies, techniques, products, and services to make the indoor environment a healthier, safer place in which to live.