Can you evacuate and recharge a unit to determine the tonnage?

Yes, evacuating and recharging a unit can help determine its tonnage. By removing refrigerant and then refilling the system with the correct amount of refrigerant, you can assess the unit's capacity and performance. However, it's essential to refer to the manufacturer's specifications for the correct tonnage and refrigerant charge to ensure accurate results. Always follow safety protocols and guidelines when handling refrigerants.