How does ductless AC work and why do buildings still use air ducts?
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Ductless AC has thin pipes (usually copper) running to the outside unit. It is a good choice is you want to cool down one room or one apartment (and not the rest of the building), and do not want a window unit (which is noisy and takes up space).
Ducted AC has one huge AC unit at cooling down the air that is then distributed via ducts. It is also called Central Air. It costs less than putting individual units into several different rooms. It lets you heat the place from the It lets you put an air filter. It circulates the air around the entire building, so one open window mean fresh air in every room.
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