Could a ductless heat recovery ventilator be used for radon mitigation?
I have a 950 sq ft home, 65 years-old, in Arizona. Block construction, on cement slab, wood roof now insulated with 3" of foam. I have measure the radon with Airthings Waveplus and it varies between 3.5 and 6.5 daily during winter with all windows closed and the heat cycling on and off.
I know I could drill into the sl...