You won't find a doctor that says mold in a home is good. In fact some studies prolonged exposure to certain allergens can increase the severity of certain health conditions, some as serious as asthma.

Sharon Mills and her husband both suffer with a respiratory disease.

"It's chronic obstruction pulmonary disease, it is associated with chronic bronchitis and emphysema," said Sharon Mills who has allergies.

Because allergens like mold and mildew make it harder for her to breath, doing laundry in her basement where you can even smell the mold, was a challenge.

"I go down stairs to do laundry. It was always stuffy. Yuck," said Mills.

Kevin Koval an expert on keeping basements clean and dry says lots of stuff can grow in a moist basement.

"In a basement that has high humidity level, over fifty, fifty five percent relative humidity, you get mold, mildew, dust mites and those are the things that create health problems in people who have asthma or even have normal allergies," Koval said.

To reduce moisture and allergens, Sharon had a Sani Dry Basement Air Systems put into her basement.

"It will lower the relative humidity to 50, 55 percent. By doing that, the air is too dry for mold and mildew and dust mites to survive. So people don't have the effects from the allergens and also won't have that musty smell in your basement," said Koval.

The unit can take just 30 minutes to put in. The machine filters and dries out the surrounding air, the water that is pulled from the air automatically drains, no water bucket needed.

Even in the cooler months when humidity is not a problem, the unit is still working through a filtration system, which is improving the quality of air."

"This unit will filter down to two microns. What I am saying, two microns, I am talking the size of the particles in the air, mold and mildew spores are larger than two microns, so they will filter out all those allergens," Koval said.

A unit costs about $1,700 dollars and its filter should be changed about every six months. You can see how much dirt is collected through the air filter. Cleaner air means better breathing.

"A lot less musty. Before it was real musty going down into the basement. We used to have mildew on the walls. No more mildew," Mill said.