Some rooms cool easily, some barely do. Regardless if duct cleaned. new unit. So we need to run it where the cooled rooms are icy cold to somewhat cool those other rooms. So theres excessive use needed to make up for disparity in cooling ability. And it costs a lot, we pay fortune in summer. And different fam members have different preferences so someone is always too cold or warm, no ability to vary by room. Unlike a split duct system/ ductless system that can be controlled by room. THIS is what I want too get when we can.