Hoping someone can help me with this. The air coming from my vents is really loud to the point where it can be distracting and annoying? A local HVAC company rep said it could be because of the ductwork but i live in a townhouse and both of my neighbors don't have the same issue. I'm pretty sure the original unit was a two ton heat pump, which is what both of my neighbors are running. I am currently running a 2 1/2 ton unit with matching air handler. Could it be that my unit is over sized and the blower is forcing too much air through the ducts? The duct work runs up from the basement with the returns by the floor and supplies coming from the ceiling (1st floor). On the second floor supply vents are on the floor as well as the returns that i have (on the wall by the floor). House is listed as 1420 sq feet but i've measured the main floor to be roughly 17 ft by 33 ft (1122 sq feet of conditioned space?) I've been thinking about putting in a new system (you can see my only other post related to this) to address this and some other issues i've been thinking about. My question is what are the possible issues? Any feedback is appreciated.