I had no system that such a small change to the Heating and A/C device would make such a big change. I was in to see my doctor a month or so ago for a routine checkup. I’m pretty healthy and try to take care of myself. I don’t come home to plop down in the central a/c of my condo to drink carona all evening. Instead, I get some sort of exercise each day and maintain a diet that is focused on greens, vegetables and whole grains. I’m actually happy that I made this change back in my thirties. It’s made a tremendous difference in my health and life. When the doctor asked myself and others if there was anything different, I let her recognize that I was dealing with a scratchy throat more often than I had in the past. She then started quizzing myself and others about my Heating and A/C and the air filter. She also asked if I had ever had HVAC duct cleaning and HVAC duct resealing done. It’s so bizarre that my partner had just gotten that done like 10 days earlier. The doctor said that was enjoyable and then recommended that I change the air filter for the Heating and A/C unit. I’d constantly used the cheapest air filters I could find. But changing to the HEPA filter has made a tremendous difference in the air quality. And it was such fantastic timing as well because of the HVAC duct cleaning and the HVAC duct resealing. The HEPA filter made an immediate impact as I haven’t had another sore throat since then. Additionally, my partner said she was breathing easier and bothered less by the dander of our cat.