In August 2018, Radon Controls installed a ventilation system in my basement to reduce my radon levels.
The workers were very polite, professional and took care to keep my house clean. New drop cloths were put down throughout the entire home, anywhere that they would be walking or working.
The work was explained to me and I got to see the flow test in action to verify the efficiency of the system. They spent extra time to locate and seal up any possible leak spots where radon could enter the basement.
My radon levels went from just over 200 to ~20 in less than 48 hours and have been down at that level ever since.
I would recommend Radon Controls to anyone.