Here is an example that attempts to answer the above questions. I consider a typical living space to be a domestic space, such as a living room or a bedroom with an area between 20 and 30 m2.
Many people are looking for an air conditioner without any particular outstanding design or special features, but the air conditioner must offer features such as quiet operation, a heat pump function, dehumidification, efficient distribution of cold and warm air, a pleasant design, high efficiency and a very good energy rating.
Service and spare parts are a prerequisite that needs special attention. The purchase of an air conditioner with installation is recommended.
Longer warranties confirm the reliability of the appliance, as this is the manufacturer's way of indicating that they are installing reliable components.