My house was built in 1951 and I don't think the vents have been cleaned since. I did contract a vent cleaning company in March 2021, but they ran the heating a/c system while they cleaned the vents and did a horrible job because the house was covered in the same dirt and dust that I wanted to remove. Through a referral from MJ Consulting, a remediation company who highly recommended Clean Air Technologies. I called, scheduled an appointment and it's been the best decision i made ever since. The vents are clean from the register to the furnace. Thank you so much, the health and happiness of my family is most important and clean air is just what we need.