Originally Posted by
tenth
Our exact situation. Moved into a new house, which tested at 1200+. Running the furnace fan 24/7 knocked it down closer to 600. Our immediate neighbours were freaked out, but only measured around 100. We've loaned out the tester to a ton of friends all over the city, some new homes, some very old homes, nobody else has tested at unacceptable levels.
We used Radon West for the remediation, and the all-in pricing was nice for us, as the work involved was extensive. Our likely biggest issue is that we had 2x furnaces that were "hung" during construction to expedite curing of the foundation (I believe) and as a result there were giant holes below each of them that were filled in. We now measure between 10 and 30.