How do you check freon levels?

To check Freon levels in an air conditioning system, you typically use a set of manifold gauges. Connect the gauges to the service ports on the AC unit: the low-pressure side (usually a blue hose) and the high-pressure side (usually a red hose). Once connected, read the pressure gauges; compare the readings to the manufacturer's specifications to determine if the Freon levels are adequate. If the pressure is too low, it may indicate a refrigerant leak or insufficient charge.