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Reply to "New HVAC increased radon levels?"
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[quote=Anonymous]OP again, thank you for the advice. The old system was a traditional variable system from Carrier, about 20 years old, and we just ran the fan on high. This new system was indeed running at what felt like a much lower capacity than what we had before - so our HVAC contractor set the airflow higher and it overrides some of the efficiency settings in order to provide more airflow upstairs. I wonder if that could be contributing to the radon situation. I read somewhere else that a heat pump that is upsized for the environment it is in can backfire and not work well, but I just don't understand enough about it to opine on it. We will definitely be remediating the radon along with continuing to try to assess what's happening. This was very helpful advice to think about. My sense is that the Heat pump installations are much more complicated than the older models.[/quote]
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