After reading on-line reviews about the coupon-offer companies and the many hidden charges they have that escalated into the thousands of dollars, I kind of backed off going with the cheapest
Angies list had several with A rating, so I called the first one to start working down the list. Airductz. I was very impressed with the professionalism and amount of information and explanation he gave, so I booked them.
So instead of the $9.95 per air duct coupon (I have only 5 ducts in this little house), I paid $300 which included antimicrobial, cleaning the coils and using antimicrobial, and triple filter vacuum unit, and that was the firm estimate with no hidden charges.
2 guys were there 2 hours and really educated me on air ducts. I feel like they did a great job, from what I know.
I don't regret the price or decision to use them.
ETA - Correction -- the company is DUCTZ
Re: Reporting back - air duct cleaning