Air conditioners are systems that provide air conditioning of environments. Air conditioning (Climatization) is the maintenance of the indoor air at the desired temperature, humidity, air circulation, cleanliness and freshness. Keeping a few, if not all, of these under control can also be defined as air conditioning. Air conditioners warm the environment in cold weather, cool the environment in which they are located in hot weather. Types of Air Conditioners Types of Split Air Conditioners. Split air conditioners or split system are known as air conditioners consisting of at least two units, Types of Package Air Conditioners, 3. Window-Type Air Conditioning, Portable Air Conditioning, Duct-Type Air Conditioning and Cassette-Type Air Conditioners are available.