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Refrigerant pressures vary greatly with temperature, that is the fundamental principal that makes refrigeration and air conditioning posible. Your question is too vague for a better answer. I am an HVAC service tech, and learning to interpret refrigerant pressures takes time to learn. If someone tells you you can add freon to a certain pressure, they are wrong, it is a combination of pressures and temperatures that have to be used to determine proper charge of refrigerant.

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