Air Purifiers

i currently have a honeywell 18155 i dont know my rooms exact measurements its an average bedroom i figure its between 500-700 sq feet well the honeywell doesnt seem to be doing the job ive had it since febuary of this year,my room has alot of dust and i know i have to dust but it should make some what of a difference and it hasnt when i clean the hepa filter and replace the pre filter theres dust in there but still i see tons of air born particles in the air…so im looking for a new purifier for my sized room that will do a much better job then this and that either doesnt need filter replacement or doesnt need it often and if it needs replacement every few months it cant be to expensive price of the purifier should be no more then 400 would love to spend less then that but really need something thats going to do the job this one truely i dont see a difference in my allergies or anything else in the air

i currently have a honeywell 18155 i dont know my rooms exact measurements its an average bedroom i figure its between 500-700 sq feet well the honeywell doesnt seem to be doing the job ive had it since febuary of this year,my room has alot of dust and i know i have to dust but it should make some what of a difference and it hasnt when i clean the hepa filter and replace the pre filter theres dust in there but still i see tons of air born particles in the air…so im looking for a new purifier for my sized room that will do a much better job then this and that either doesnt need filter replacement or doesnt need it often and if it needs replacement every few months it cant be to expensive price of the purifier should be no more then 400 would love to spend less then that but really need something thats going to do the job this one truely i dont see a difference in my allergies or anything else in the air