Air Purifiers/filters?

Air-Purifiers/filters?
Hi guys… I want to buy and air purifying system that works indoors either with open or closed windows, but I was wondering is air filtration in AC’s are as efficient as stand-alone air filters (air purifiers)? if they are the same then I think having and AC with air filter will be economically worth it but if not then I prefer to go for the best standalone filter
I can tell you this: I have 2 Ionic Breeze units purchased from the sharper image. They seem to work very well, cost pennies to operate, and are completely silent. I dont REALLY know how efficient they are, but the dirt and junk pulled out of the air that is on the grid when you clean them is unbelievable! The only downside is they are quite pricey….may be something to look into if you are interested.
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I can tell you this: I have 2 Ionic Breeze units purchased from the sharper image. They seem to work very well, cost pennies to operate, and are completely silent. I dont REALLY know how efficient they are, but the dirt and junk pulled out of the air that is on the grid when you clean them is unbelievable! The only downside is they are quite pricey….may be something to look into if you are interested.
do a google on HEPA filters:i think hospitals use these!
i wonder if you may add this on to the AC?
or separate?
i wonder, maybe it works more efficiently if its by itself?