Last Updated on October 26, 2026 by Umar Farooq
Can you use a dehumidifier with a smart plug? Yes, provided the dehumidifier switches itself back on when power returns and the plug is rated for more than the machine draws. Miss either condition and you have bought a gadget that cuts the power and then cannot restore it.
I like a smart plug for the same reason I like a kettle with a thermostat: it does one dull job reliably. The trouble starts when people ask it to be the brain of the whole operation.
Can you use a dehumidifier with a smart plug? What it actually controls
A smart plug switches mains power on and off from your phone, on a schedule or from an automation. That is all it does.
It cannot read the room’s humidity unless you pair it with a separate sensor, it cannot empty the tank, and it cannot press a button on the machine. So the useful question is not “will it work?” but “what is it replacing?” If the answer is “the walk to the wall socket”, fine. If the answer is “the humidistat”, read on, because that is the mistake.
Some dehumidifiers do not need one at all. Midea’s Wi-Fi model, for instance, lists an app, voice control and “scheduling run times via app or voice assistant” among its features, which is the plug’s job done inside the machine.
Rule 1: the dehumidifier must restart by itself
This is the rule that breaks most setups. When a smart plug turns power back on, the dehumidifier has to start without being touched.
One user in a Home Assistant community thread recommends putting a “dumb” dehumidifier on a smart plug because, in their experience, basic ones remember their previous state after an outage. Another poster in the same thread reports that one setting, bucketless mode, does not persist when power is lost. Those are individual reports, so do not generalise them. The point is that it varies by model.
Find out with the two-minute test in what a dehumidifier does after a power cut. A machine that sits in standby until you press a button will sit in standby forever behind a smart plug.
Rule 2: check the plug’s rating against the plate
Every smart plug has a maximum load printed on it, usually as amps, and every dehumidifier has a rating plate with its watts. Put the two side by side before you plug anything in.
Domestic dehumidifiers typically draw somewhere between 150 W and 900 W, as covered in the running cost guide, and the plate is the number that counts. Convert it yourself: amps are roughly watts divided by volts. As my own arithmetic, a 900 W machine on a 230 V supply draws a little under 4 A, and on a 120 V supply a little under 8 A. Compare that with the figure on the plug, with room to spare, because a dehumidifier runs for hours rather than minutes.
Electrical Safety First makes the general point that overloading a lead or adaptor can cause overheating and fire, that adaptors share the same limit as leads, and that you should use only one extension device per socket. A smart plug is an adaptor, so the same logic applies.
Never plug a smart plug into an extension lead or into another adaptor and then run a dehumidifier from it. Plug it straight into a wall socket, and if the socket is in a damp garage, cellar or shed, ask an electrician whether it is suitable. The wider case against leads is in using an extension cord with a dehumidifier.
Rule 3: leave the humidistat in charge
Set the dehumidifier’s own humidity target and leave the machine switched on at the unit. The plug should provide a schedule or a remote off-switch, not replace the control that decides how much to dry.
The reason is that the humidistat measures the air at the machine and cycles it sensibly. A plug on a timer does not know whether the room is at 45% or 75%: it runs for the hours you set and stops, whether or not the job is done.
If you want automation that responds to humidity, you need a separate sensor. One SmartThings community project does exactly that, pairing an external humidity sensor with a smart plug and using a band around the target: its example is a 50% setpoint with a 5% overshoot, so the plug switches between 45% and 55%. It also offers a minimum off time and a runtime alert, which the author says is meant to catch a frozen evaporator. That is a hobbyist build and the thread is marked obsolete, so treat it as an illustration of the idea.
Where a smart plug quietly lets you down
- A full tank. The plug cannot empty the bucket. If the machine stops when the tank fills, it stops whatever the app says, unless a drain hose lets it run continuously.
- Rapid switching. Cutting power every few minutes is hard on any machine, and compressors in particular are built to wait before restarting. In that SmartThings thread one commenter reported damage after power was cut while the compressor was running, though the author doubted that was the cause. I cannot settle that for you, so keep any schedule to long runs and long rests.
- A false sense of safety. A plug that turns the unit off on time is not a substitute for a clear lead, a dry socket and a unit with a sound plug.
A smart plug is a switch, so let the dehumidifier keep its own brain
Use the plug to start and stop the machine, not to decide how hard it works. Check that the unit restarts by itself, match the plug’s rating to the plate with a margin, plug it straight into the wall, and leave the humidistat set.
FAQ
Is it safe to plug a dehumidifier into a smart plug?
It can be, if the plug is rated for more than the machine draws, is fitted directly into a wall socket and the dehumidifier’s own lead and plug are undamaged. Check the rating plate on the unit, not the box.
Will a smart plug turn a dehumidifier back on?
Only if the dehumidifier itself restarts when power returns. The plug can restore power but cannot press the unit’s buttons, so a machine that waits in standby will stay off.
Can I put a dehumidifier on a plug-in timer instead?
A plug-in timer has the same limits as a smart plug: it switches power and nothing else. It will run the unit for the hours you set whatever the humidity is, so leave the humidistat set as well.
Do I need a smart plug if my dehumidifier has Wi-Fi?
Probably not. Models with their own app can usually schedule runs and adjust settings directly, which is the plug’s job done by the machine.
Can a smart plug stop my dehumidifier running when the tank is full?
No. A full tank is detected by the unit’s own float switch, and the plug has no way to see or empty it. A drain hose is the fix, not an app.
