Refrigerant charging is the act of adding cooling fluid to the HVAC system to reach the correct pressure. While many of our systems come pre-charged, some larger Penta-Zone setups might require additional fluid for long line sets. You can find charging hoses and gauges in our Other Accessories category. Proper charging is crucial; too much or too little refrigerant will cause the system to fail. This task is typically performed by a certified HVAC technician. It ensures the system can transfer heat efficiently.