I highly recommend Radon Resolutions for eliminating dangerous radon gas. We tested our house and it was well over the limit. 18 was the reading, evidently any number over 4 is high levels. We called a few places for estimates and the guy from RR seemed more knowledgeable and honest than the others. He walked us through the process and was quoted a fair price. Our system is running as we speak and our post tests are less than 1! Safe level! My advice is to Call them before you purchase a system. Good luck and dont underestimate how dangerous this gas is!