Can you put a window air conditioner on a smart plug?

Two answers circulate, and both are aimed at the wrong question#

The first answer says a smart plug only works with old window units that have mechanical knobs, because a unit with a digital panel will sit there dark when the plug turns the power back on. The second says any 15 A smart plug can run any 115 V window unit, since even a 12,000 BTU model draws well under 15 A.

The first is out of date: the makers read for this page say their electronic units remember. LG's spec sheets carry a line that reads "Auto Restart: Yes". GE's manual for its AEW and AEZ units says that after a power outage "the unit will automatically re-start in the settings last used". Frigidaire's support page says the unit "will memorize the last setting and return the unit to the same setting once power is restored." A smart plug cutting power and restoring it is, to the air conditioner, a short power outage.

The second reads the wrong line on the plug. The 15 A on most smart plugs is a resistive rating, for heaters and lamps. A window unit is a compressor and a fan, and plug makers give motors a separate, much lower limit in horsepower. That limit, converted to amps, is the number to compare.

Will the air conditioner turn back on?#

As published on each maker's own spec sheets, manuals and support pages, read in October 2026.

Three things come out of that table:

1. Electronic is not the problem. Every model read here with a thermistor, a remote or Wi-Fi documents a restart. LG pitches it for storms ("your unit automatically turns back on when power returns"), and the same mechanism answers a smart plug.
2. The knob unit has no restart line, and needs none. A rotary control stays where you left it when power drops, so returning power finds it still set to cool.
3. The 18,000 BTU unit cannot take a smart plug at all. It runs at 208 or 230 V, and every plug here is a 120 V device.

LG's help page for its wall-mounted units adds a detail most guides miss: auto restart is a setting that can be switched off, by holding the forced operation switch for 7 to 8 seconds until a second beep. A unit that once restarted and now stays dark after a power cut may have had it toggled.

Is the plug rated for a compressor?#

TP-Link explains why the resistive figure is the wrong one. Its smart plug FAQ says "some inductive loads can draw a significantly higher inrush (peak) current at startup, which may damage the smart plug even if the device's rated power appears to be within the supported limit", and lists "air conditioners, refrigerators, washing machines, fans, water pumps, and vacuum cleaners" as the appliances that do it. That surge happens every time the compressor starts. The general version of this problem, and why worn relays weld shut, is in smart plugs and what their energy numbers are worth.

Plug makers handle motors with a horsepower rating. A horsepower rating means little next to an air conditioner's nameplate, which gives amps. The bridge is NEC Table 430.248, which lists the full-load current of single-phase motors at 115 V: 1/6 HP is 4.4 A, 1/4 HP is 5.8 A, 1/3 HP is 7.2 A, 1/2 HP is 9.8 A, 3/4 HP is 13.8 A and 1 HP is 16 A. Converting each plug's motor rating with that table gives a number you can set directly against the air conditioner's rated amps.

Set the two tables against each other and the answer becomes specific:

• A 1/6 HP plug (4.4 A) covers the 5,000 BTU LW5016 at 4.1 A and nothing larger. The 8,000 BTU LW8017ERSM at 6.2 A is already over it. That is every Kasa and Tapo plug in the table.
• A 1/2 HP plug (9.8 A) covers every 115 V unit read here, up to the 12,000 BTU models at 9.3 A, with half an amp to spare.
• A 3/4 HP plug (13.8 A) such as the Leviton D215P covers all of them with room left over.
• The Zooz ZEN15 is the only plug read here whose maker sells it for window air conditioners by name. Its manual gives a 15 A, 1800 W rating without a horsepower figure.

Where the "any 15 A plug" belief comes from is easy to find. TP-Link's HS103 page carries a comparison chart row reading "Switch Heavy-Duty Devices (up to 15A) e.g. Portable Heater/AC, Coffee Maker", ticked for the 15 A Kasa models, while its FAQs and the EP10's 1/6 HP rating say otherwise. The same contradiction runs through the space heater page, and the resolution is the same: the document written about motors governs.

The circuit limit that catches the 12,000 BTU size#

A plug rated for the motor is still only as good as the circuit behind it. The National Electrical Code's rule for cord-and-plug room air conditioners (440.62) caps the unit's marked rating at 80% of the branch circuit when nothing else is on the circuit, and at 50% when lights or general-use receptacles share it.

On a 15 A circuit, that is 12 A on a dedicated circuit and 7.5 A on a shared one. The LW8017ERSM at 6.2 A fits either way. The LW1016ER at 7.7 A and the 12,000 BTU LG models at 9.3 A exceed 7.5 A, so by that rule they belong on a circuit of their own, which is not where most bedroom outlets are. GE's manual says the same thing in plainer words: the air conditioner "should always be plugged into its own individual electrical outlet", on a 115 or 120 V outlet "protected with a 15-amp time-delay fuse or circuit breaker".

GE's manual also says "DO NOT use an extension cord" and "DO NOT use surge protectors or multi-outlet adaptors". A smart plug is none of those, and GE says nothing about smart plugs either way, but it is one more connection in series with that load: straight into the wall, never into a power strip.

The three-minute rule automations break#

GE's manual says that when the unit is turned on in a cool setting, "it may take approximately 3 minutes for the compressor to start and cooling to begin", and its troubleshooting table calls this "a protective time delay" that exists "to prevent tripping of the compressor overload". That has two consequences for a smart plug:

• Do not judge the switch-on by the first minute. Fan running, no cold air, is the delay working.
• Do not build a thermostat out of the plug. An automation that cuts the plug when a room sensor reads 72°F and restores it at 74°F replaces the air conditioner's own thermostat with on and off power cycles, each one a full compressor start. Leave the unit in cool mode at the temperature you want, and use the plug for the schedule only: on before you get home, off when you leave. Automation design has the general rule against automations that fight a device's built-in control loop.

The same goes for what happens after a real power cut. The plug comes back according to its own power-on setting: Leviton says its D215P "returns to last state after minor power fluctuations", and Zooz exposes a power failure memory setting on the ZEN15. The air conditioner then restarts according to its own memory. Both have to say on for cooling to resume, which is worth checking before a heat wave rather than during one. What still works when the internet goes down covers the plug side of that chain.

Better ways to schedule a window unit#

A smart plug only gives you on and off at whatever setting the unit last had. If you are choosing now, look at these first:

1. The air conditioner's own Wi-Fi. LG's LW8017ERSM sheet promises app control of "temperature, scheduling, mode and fan speed". The trade-off is the maker's cloud: a unit that loses its cloud loses its app, and Wi-Fi devices have other hidden costs.
2. An infrared controller. Homey Pro can present an IR-controlled air conditioner to voice assistants as a thermostat, so you set a temperature rather than cutting power.
3. Matter, eventually. Room air conditioners have been a Matter device type since version 1.2, but certified hardware is thin. Treat it as a reason to prefer a Matter-ready unit, not a plan for this summer.
4. The plug, done properly. A motor rating that covers the unit's amps, straight into the wall, on a circuit the unit can legally have, on a unit that restarts. A Z-Wave plug keeps the schedule running on a hub like Home Assistant with the internet down, for the reasons in local versus cloud control.

If you rent, the plug and the IR controller need nobody's permission; a smart home for renters covers the rest.

Where this page stops#

• US, 115 V window units, from LG spec sheets, GE's AEW and AEZ manual and Frigidaire's support page, as of October 2026. Midea, Haier, TCL and portable units were not read from first-party documents, so the page makes no claim about them.
• The amp conversion is this page's method. Only TP-Link, on the P210M, publishes a motor rating in amps. The rest are converted with NEC Table 430.248; where a maker's own word is stricter, as TP-Link's is, it wins.
• No maker publishes inrush current, for the air conditioners or the plugs, so the comparison uses rated motor current instead.
• Ratings change. The Leviton DW15A is already discontinued. Read the page for the model number on your box, as the buying checklist says for every device.