ADC was hired to do my duct cleaning by my HVAC company, so I didn't choose them directly, but I'm very glad they were the ones to do the job. Nelson and Santiago were my techs, and were very friendly, polite, quick (~2 hours), and courteous as they wore clean booties all throughout, laid down proper sheets to protect my floors, covered intake vents while working, vacuumed afterwards, etc. They explained everything every step of the way, and I would highly recommend them both.