How Many Amps Does a Central Air Conditioner Use?

Central Air Conditioner amperage at 120 V and 240 V

Same 3,500 W load: the current halves when the voltage doubles. Central Air Conditioner is typically a 240 V appliance in US homes.

The startup surge lasts a fraction of a second; it matters for generator sizing and breaker trip curves, not for your electric bill.

Breaker and circuit for a central air conditioner

Central Air Conditioner runs on its own dedicated 240 V circuit: plan on a 30-45 A breaker, per the unit's nameplate MOCP. Air conditioners are sized from the nameplate MCA/MOCP under NEC Article 440, not from wattage: a 3-ton condenser typically lists a 30-45 A maximum breaker.

Guidance only: actual circuit sizing depends on your unit's nameplate, wire run length, and local code. Confirm with a licensed electrician. See the wire & breaker size chart for the full NEC ampacity table.

Measure what a central air conditioner actually draws

The figures above are typical ratings, and this load is usually hardwired or on a 240 V circuit, so a plug-in meter can't reach it. A clamp meter reads the current on one conductor at the disconnect or panel without breaking the circuit; opening a panel is work for someone qualified, and the voltage pen confirms a circuit is dead first.

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Clamp meter

Fluke 323

Best for: Measuring what a hardwired circuit actually draws, even in a crowded panel

Check price on Amazon: Fluke 323 (opens in a new tab)(paid link)

Non-contact voltage tester

Klein Tools NCVT-3P

Best for: Confirming a circuit is dead before you open a device or box

Check price on Amazon: Klein Tools NCVT-3P (opens in a new tab)(paid link)

Frequently asked questions

Amp draw of other appliances

• Space Heater13 A
• Window Air Conditioner10 A
• Heat Pump13 A
• Ceiling Fan0.5 A