Radon Mitigation Services was the second company I worked with to install a radon mitigation system. They arrived on time, kept the house neat and explained my options clearly. They did not guarantee that the radon would be reduced below 4.0 because that is not always possible. I highly recommend them and they are one of the only reliable radon mitigation services in the State of Florida. Gene also suggested an independent tester that will give you the test tapes so you can verify the data. I used my own portable tester and compared it to the test data and they were very similar. When I first discovered the radon, I looked on the State of FL website to find the contractors. I called a few and most do not do residential. RMS had a busy schedule so I called the only other one that would do residential. Big mistake! The OTHER COMPANY that I will not name guaranteed to get the radon below 4.0 and required $1,000 deposit on the $2,000 job. The guarantee means they will keep coming out and boring holes and putting fans and pipes all over your foundation and house until you either give up or they test it as 3.9. The other company cost me a few days off of work and $1,000 before I told them to go away. RMS came out and removed their system. In the process they discovered one of the pipes on the old system had about 25 gallons of water that could have spilled into my attic. The RMS guys literally caught it as it was about to spill. This water got there because the radon system pulls air from your foundation. The air condenses and creates water droplets. The other company had installed the system incorrectly and it trapped the water in the attic pipes instead of dripping under the house. This built up over time and would have spilled in my attic and house had I not turned off the system when it started making noise. The other company also made a mess in my house and did such a poor job hiding the pipes that my neighbors commented that they seemed easy to hide, but it looked like they just didn't bother. In summary, save yourself some trouble. Go to RMS and avoid "guarantees", not so independent testing, a messy house and generally bad work. There are a lot of people in the radon business that should not be in business at all. Avoid them and go with Radon Mitigation Services. Best of luck.