An actual cooling system or heat pump may be overcharged if it contains too much refrigerant, air conditioners plus heat pumps can generate boiling plus chilly air using refrigerants that are either boiling or cold, depending on the state of compression. According to the manufacturer, your HVAC method needs to be charged at a particular level that has neither too low nor too high! If the HVAC method loses its charge due to a refrigerant leak, it will have to job harder just to meet its cooling requirements! Freezing coils plus premature failure may also occur, then when a DIYer or inexperienced serviceman tampers with the HVAC system… They could put too much refrigerant in, and the assumption is that the more refrigerant you put in, the more cooling you’ll get. This is not true at all either. It’s like giving your HVAC method elevated blood pressure, which can lead to various problems. The excess refrigerant in your heating plus A/C method will collect inside the compressor, resulting in subcooling, resulting in temperatures that are far below normal as well. HVAC systems aren’t designed to handle sub-zero temperatures like your freezer, and excess refrigerants can also injure the HVAC system’s electronics inside. A high refrigerant pressure will also alter the compressor-condenser cycle, which will increase the stress on the HVAC method plus reduce its efficiency, but your energy costs may rise abruptly as a result. You should also keep an eye out for random shutdowns plus squealing sounds from the compressor. The first thing you should do is contact a certified HVAC serviceman, who will calculate the proper refrigerant levels plus restore a normal charge; and depending on the extent of injury caused by the overcharge, repairs may also be necessary.