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