Though all models of RV air conditioners have nuanced differences in design, there are core parts found in every single one including evaporator coils, refrigerants, a compressor, and condenser coils because they’re integral in the process of cooling air.
For RV air conditioners, the unit pulls hot air from the interior of your coach through the intake vent and forces the heated air over the evaporator coils that are filled with refrigerants. The refrigerants, which are cooling chemicals in a liquid form, absorb the heat from the air and this energy transfer has two effects. First, the air is cooled; and second, the refrigerant is converted into a gaseous stage. That cooled air is then pushed back into the RV interior to drop the ambient temperature.
The gaseous refrigerant needs to be converted back into a liquid form in order to continue the cooling cycle, so it moves to the compressor. The compressor puts an incredible amount of pressure on the refrigerant forcing the chemical to release heat as it converts back into a liquid. The heat is then dispersed from the RV to the outside world via the condenser coils (located on the RV rooftop) and the liquid refrigerant is moved back into the evaporator coils to restart the AC process.