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Hello. I have my 3 ton ac unit in my attic on third floor. The thermastat is on second floor which get gets very cool during summer. First floor is not as cool. When I put my 5x25 honeywell air filter in, it seems to get dirty very quickly(within a few days) can that be restricting air flow to my first floor? When I walk down from my attic I noticed inside the Return looks dusty. Would simply cleaning out the return help air flow or do I need to clean all the ducts?