*4.1.1 The window-type air conditioner*

This type of air conditioner has all the components assembled in one compartment. It is often inserted through the wall of a building, but due to the configuration and installation, the hole carved on the building wall weakens the structure over a while. It also provides an opportunity for external factors such as rats and snakes to enter through the small openings on the wall. Though, it is readily available and cheap [18, 19].
