@FediThing @dean @pezmico It's been in commercial production for years, and is available for home installation. It's used both for sterilising the air and for sterilising internal coils (microbe habitat surfaces).

I don't know how well regulated it is, though, notably on the ozone concentration front. HVAC sizing is something that people often get wrong so it wouldn't surprise me if people often choose excessively powerful UV bulbs and end up with far more ozone than is healthy.