To determine the tonnage of your air conditioning (AC) unit, you can follow these steps:
Look for the model number: Find the model number of your AC unit. It is usually located on a nameplate or sticker on the outdoor condenser unit or the indoor air handler/furnace.
Identify the tonnage indicator: Check the model number for a numeric value followed by "ton" or "T." For example, if you see numbers like 2, 2.5, 3, etc., followed by "ton" or "T," it indicates the tonnage of the AC unit.
Interpret the tonnage value: The tonnage value represents the cooling capacity of the AC unit. One ton of cooling is equivalent to 12,000 British Thermal Units (BTUs) per hour. So, a 2-ton AC unit can cool approximately 24,000 BTUs per hour, a 2.5-ton unit can cool around 30,000 BTUs per hour, and so on.
Keep in mind that the tonnage of an AC unit is not the actual weight of the unit but rather its cooling capacity. The higher the tonnage, the greater the cooling capacity of the unit.