Putting refrigerant into a residential heat pump requires specialized technical expertise, EPA Section 608 certification, and professional-grade diagnostic equipment, making it strictly illegal and unsafe for untrained homeowners to perform. A licensed HVAC technician begins the process by attaching a manifold gauge set to the outdoor service ports to measure operating pressures, superheat, and subcooling. If a leak is suspected, they must pressurize the system with nitrogen, locate the leak using electronic detectors or soapy water, and repair the copper tubing or fittings. Once the leak is sealed and the system is evacuated with a vacuum pump to remove moisture and non-condensable gases, the technician connects a refrigerant cylinder and weighs in the exact manufacturer-specified factory charge by weight. You can verify proper charging when operating pressures and temperatures fall within manufacturer specifications.
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