If you want to have nice air quality in your home, a nice way to beginning with this is to make sure that you change the air filters of your central heating and a/c system at least once a month; Even if you have the honestly high quality air filters love HEPA air filters that can last up to a few months or more before needing to be changed, it is a wise plan to change the air filter of your central heating and a/c system at least once a month to help retain nice air quality in your house. If you live in an area that happens to have poor air quality, changing the air filter of your central heating and a/c system at least once a month honestly still helps. If you do that plus run some kind of air purification system your home can have the most good air quality when it is the worst air quality outside, however how do I know all this? From experience. I tried all kinds of bizarre things to have the best possible air quality in our home and it all starts with the air filter changing in your central heating and a/c system unit. This is the best thing to do and the best way to start. I bet you would have never thought that your central heating and a/c system plays a large area with your indoor air pollen levels. Well, I didn’t guess so either until I honestly discovered all of this on our own through trial and error, good air quality makes for good indoor comfort.