Anyone familiar with these systems? My installer works with this company, but if there are better choices out there, I'd like to give them a look before committing to this one.

It is an UV and Ionization system.

Currently I have a bypass HEPA filter on each of my two floors which are 800sf each. I'm thinking of adding these UV units to that system among other things as needed. I'm currently gauging humidity levels during the different seasons to see what else I may need, be it dehumidifier or humidifier... or whatever the tests show me.

It's going to take a full year at least to see what levels my house has and the fix for it. I'm well aware of the good advise given here of keeping the RH under 50% (fresh air, etc...) and gauging that throughout the year.