I saw a coupon for this business in a mailer that offered a small service for a good price. I called them and arranged to have them come out to my home. Once there, they glanced at my vents and immediately claimed they saw traces of mold, which is detrimental to human health.
They explained that they could perform a quick mold test to determine if further work needed to be done. I asked them to simply clean the vents as specified on the coupon, but they refused to perform the service without performing the mold test first. I agreed with the understanding that I was under no obligation to purchase anything other than the original service I wanted from the coupon.
After they performed the test, which took all of 30 seconds, the guy claimed I had dangerous mold and refused to do anything else unless I agreed to a service that costs upwards of $300.
Needless to say, I paid for the mold test and asked them to leave my house. I called another company for a 2nd opinion and learned that my vents didn't house any mold at all.
Buyer beware.