Pros: The cheapest among this four best units. You don't need a ductwork to install that unit. Cheaper to install than the typical central air conditioners. People in each room in their home can adjust the temperature to their own preference. Cons: Although its features are practical for a lot of, it also needs more maintenance work to make it run efficiently. So, you might spend considerably to keep it with good working condition. Split types usually need more work constantly. My websites: