Mini-split heat pump systems are typically charged with refrigerant while the system is actively running in the cooling mode, especially when technicians are measuring superheat and subcooling parameters to verify correct charge levels. Technicians connect manifold gauges and digital scales to weigh in precise amounts of refrigerant according to the manufacturer's exact specifications for line-set length. Charging a system while running requires specialized HVAC training, as improper refrigerant levels can severely damage the variable-speed inverter compressor or reduce operational efficiency. Homeowners should never attempt DIY refrigerant handling due to environmental regulations and high-pressure system safety hazards.
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