What should get the credit?
I had something installed on all my furnaces last year (I have 3 separate furnaces). It is something made by Honeywell and it is supposed to do what this device says it will do. I was so desperate at the time that I was trying anything. I don't know if it has helped reduce colds in our household or not. I had a couple last year prior to stem cell therapy and I do think they were milder. I also do energetic balancing and now the stem cell therapy so I don't know if the latter two are helping me be healthy now or if the furnace filters help. I feel better than ever, so who knows.