The question of the day is…can air quality that is fine be better than outdoor air quality that is fine and natural? That all depends on a lot of things. Indoor air quality that is great because of a whole home air purification plan of course is unnatural quality air. Although it can not harm you in any way, shape or form, whole home air purification systems creating fine air quality is only the best if you have lousy outdoor air quality. Or, if it is so tepid outside, that you have to be indoors with your central heating and air conditioner plan with the thermostat cranked down all the time. Then, a whole home air purification plan is all that you would have to be able to breath in great air quality. If you have quality air outside all the time, you would not need to invest in a whole home air purification system, and you would be able to leave your windows opened quite a bit to get that fresh air quality flowing through your home. That is what I do in our beach condo down the shore in the summer. The heat is not too bad at night, so I turn off the central a/c, and then I open up all the windows and let that appealing ocean air quality into the house. It genuinely makes a crucial difference. I do not have a whole home air purification plan down there. Only in our condo at home. That is because the air quality here can get pretty bad.