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nbsixer1 karma

My house was unoccupied for several years (5+) and then sparingly for 2-3 months out of the year before that. Before we bought the house, we found it had levels of 21pCi/L. Could this high of level be from lack of airflow in the house since nobody was living there?

Also, we are renovating some things...should I wait until after renovations are complete to work on getting a mitigation system installed? Once installed, do I still need to retest after every renovation?

Finally, what is the typical cost of a system that you install and what factors will make it more or less costly?