If two air conditioning units are set to the same temperature, such as 17 degrees Celsius, and the room is initially at a higher temperature, it is possible for the actual room temperature to fall below 17 degrees. Air conditioning units work by removing heat from the room and lowering its temperature.
When the air conditioning units are turned on, they extract heat from the room by transferring it to the refrigerant in the system. The refrigerant absorbs the heat and is then expelled outside the room. As a result, the room's temperature decreases.
The actual temperature achieved in the room depends on factors such as the cooling capacity of the air conditioning units, the size and insulation of the room, the heat load in the room (due to factors like sunlight, appliances, and human occupancy), and the efficiency of the air conditioning system.
If the cooling capacity of the air conditioning units is sufficient for the room size and heat load, and if the room is well-insulated, it is possible for the actual room temperature to fall below the set temperature of 17 degrees Celsius. The air conditioning units will continue to cool the room until they reach the desired temperature or until they are turned off or adjusted.
However, it's worth noting that setting the air conditioning temperature too low can result in excessive cooling, discomfort, and potential energy waste. It's generally recommended to set the air conditioning temperature at a comfortable level, typically around 24-26 degrees Celsius, to achieve a balance between energy efficiency and comfort.