A 3-ton air conditioner typically uses between 15 and 25 amps.

A 3-ton (36,000 BTU) central air conditioner generally draws 15 to 25 amps when operating, depending on its efficiency rating, voltage, and specific components. This amperage is for the outdoor compressor unit. Indoor blower units typically draw 3 to 6 amps separately, bringing the total system amperage slightly higher.

Factors Influencing Amp Draw

• Voltage Supply: Units operating at higher voltages (e.g., 230V) draw fewer amps than those at lower voltages (e.g., 208V) for the same power output.
• SEER Rating: Higher Seasonal Energy Efficiency Ratio (SEER) units are more efficient and may draw slightly fewer amps.
• Compressor Type: Single-stage, two-stage, or variable-speed compressors have different power demands. Variable-speed units draw less during partial load.
• Startup Surge: Initial startup can cause a temporary surge in current, often 3-5 times the running amps.
• Motor Efficiency: The efficiency of the fan motors and compressor motor impacts overall current draw.

Typical Amp Ranges for 3-Ton AC

For a 3-ton unit (36,000 BTU), here are common running amperage ranges:

• 208V Systems: Approximately 18-25 amps
• 230V Systems: Approximately 15-22 amps

These figures represent the compressor and outdoor fan. The indoor blower motor usually adds 3-6 amps, requiring a separate circuit or considering the combined load for proper electrical sizing.

Amperage Comparison by Voltage