Yep, if you have already got a central air system in your home, You need to use your existing duct system to move the air from the heat pump. And you don’t in fact have to have ducts: Air-source heat pumps also are available in the form of ductless mini-splits. https://gregoryudjqg.theisblog.com/27115837/the-greatest-guide-to-air-conditioner-maintenance