Initial radon levels in upstairs living areas were 10.5 and were reduced to less than 2.0 on post-install testing a week later. Our basement waterproofing system included a sump crock and a perimeter wall weepage track that drains into perimeter drain tile (There is no drain tile exterior to the basement walls and no exterior basement wall waterproofing on our 1970's single story ranch-style house.) We fixed the water problems by improving gutters and drainage and waterproofing basement walls so we no longer needed the wall weep track. That allowed us to have the weep track sealed with foam backer rod (we can remove the foam rod for drainage if we have a bad water event.) Sealing the weep track was necessary to prevent radon from entering the basement from under the slab and to use the perimeter drainage system to help draw air from under the slab to exhaust the radon with the mitigation system. We had minimal wall cracks and floor cracks that we already sealed prior to this radon service. A.T. Pro Mitigation worked with me to devise a system that would be quiet, unobtrusive, and efficient. They originally proposed using the sump crock as the collection point and running the exhaust up the back wall of the house. I wanted the exhaust pipe to run up through the attached garage and out the roof to avoid having the fan and the exhaust piping near our bedroom windows and to minimize fan freeze-up or condensation problems. They agreed that exhaust through the attached garage wall could work and that I might still be able to use just the one suction point because it could be attached to the perimeter interior drain tile system. They were very conscientious about the pipe sizing and length requirements, the fire protection, the necessary clearance above the roof to disperse the radon and the distance the exhaust would have to be from any windows. Our system uses the perimeter drainage system to help gather radon from under the entire basement slab at one suction point. It works beautifully and quietly and has good airflow that I monitor with a manometer installed on the exhaust pipe in the basement. The suction pipe site was well chosen and was close to an already existing electrical connection in the garage for the fan. The pipe length was minimal to maximize air flow. It works great. The owner of the company was also the installer and was very good at the job. Everything was done neatly, joints sealed, roof exhaust pipe flashed and sealed, electrical draw accounted for on that circuit. The system works well and I have not noticed an increase in the electric bill since the fan draws minimal energy.