I have an extremely dusty house. I do not have nor is central air a feasibility. My bedroom is roughly 400sf and I have a slider. Currently I am using a Honeywell which works just fine but it is insufficient for the area and the environment is so dusty that I go through a filter every three weeks at 50 bucks a pop! I need a machine with a higher capacity, with more reasonably priced or filters that can be used more than once. Any recommendations? I don’t need to know about where to buy them I need - names- product numbers to peruse. Thanks.