Punch in your gauge pressures and line temps. It computes superheat and subcooling off the PT curve and tells you whether the system is undercharged, overcharged, restricted, or good — with the reasoning, so you can apply your own judgment.
This is a starting point, not a verdict. Confirm airflow first (filter, coil, blower) and verify your gauge + thermometer readings before adding or recovering refrigerant. Manufacturer charging charts always override these defaults.
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