Superheat Subcooling Charge Method for HVAC Techs Learn how to correctly adjust refrigerant charge when superheat or subcooling is off after a repair with step by step guidance for HVAC technicians and DIY-savvy homeowners. This tutorial covers measuring suction and liquid line temperatures, calculating superheat and subcooling from pressure and temperature readings, using manufacturer charge charts, identifying thermostatic expansion valve versus fixed metering systems, and safe Environmental P
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