How Many Amps Does a Dehumidifier Use?
Dehumidifier draws about 4.2 amps at 120 volts (500 watts running) and briefly spikes to around 5.8 amps at startup. At 4.2 A, a dehumidifier fits comfortably on a standard 15 A or 20 A household circuit.
Amps = watts ÷ volts. Enter the wattage from your appliance's nameplate or label for an exact figure.
Current draw — a dehumidifier
4.2 A
- At 120 V
- 500 W
- Typical breaker
- 15 A
Breaker figure is guidance for a simple resistive load, sized at 125% for continuous running — confirm against the nameplate and a licensed electrician.
Dehumidifier amperage at 120 V and 240 V
Same 500 W load — the current halves when the voltage doubles. Dehumidifier is typically a 120 V appliance in US homes.
| Draw | Watts | Amps at 120 V | Amps at 240 V |
|---|---|---|---|
| Running | 500 W | 4.2 A | 2.1 A |
| Starting (surge) | 700 W | 5.8 A | 2.9 A |
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 dehumidifier
At 4.2 A, a dehumidifier fits comfortably on a standard 15 A or 20 A household circuit. For a dedicated circuit, guidance is a 15 A breaker with 14 AWG copper (75°C terminations) — sized at 125% of the running current because it runs 3+ hours at a time (NEC 210.20).
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.
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