Smart Home Pick Pro

Best Smart Plugs for Space Heaters and Window AC Units

By the Smart Home Pick Pro Editorial Team · How we test & rank

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A lamp or a phone charger draws a trickle of power, but a space heater or window AC unit can pull 1,200-1,500 watts continuously for hours at a time. That's a very different job for a smart plug's internal relay than switching a light on and off, and it's exactly the use case our main smart plugs roundup's FAQ warns about: don't put a high-draw appliance on a plug unless it's explicitly rated for that wattage.

The plugs below all publish a clear 15-amp/1,800-watt rating (the same ceiling as a standard U.S. household outlet) rather than leaving you to guess, and we note which ones add the extra reassurance of an established electrical-hardware brand or real-time wattage reporting so you can confirm the appliance isn't running close to the limit.

New to this category? Start with our how to monitor and cut energy usage with a smart plug before diving into the picks below.

How we picked: We only considered plugs that list an explicit amp/watt rating on the spec sheet, and prioritized models from brands with a track record in either electrical hardware or smart plugs specifically, since a continuous high-draw appliance isn't the place to gamble on an obscure brand's relay quality.

At a glance

#PickWhy it stands outPrice
Leviton Decora Smart Wi-Fi Plug-In Outlet (DW15P)Top Pickpick from an electrical-hardware brand - Made by Leviton, an established electrical-equipment manufacturer rather than a consumer gadget brandCheck Amazon
Kasa Smart Plug KP125Runner-upconfirming the appliance's real wattage draw - Real-time energy monitoring shows exactly how many watts the heater or AC unit is actually pullingCheck Amazon
BN-LINK Smart Wi-Fi Heavy-Duty PlugBest Valueexplicitly heavy-duty-marketed pick - Marketed specifically for space heaters, window AC units, and other continuous high-wattage appliances, not just lampsCheck Amazon
Eve EnergyAlso greatlocal, no-cloud control - Native Thread/Matter support means on/off commands run locally instead of round-tripping through the cloudCheck Amazon
Amazon Smart PlugAlso greatsimple pick already rated for a full-size appliance - Rated for 15A/1,800W out of the box, with no 'heavy duty' upsell neededCheck Amazon

The picks in detail

Leviton Decora Smart Wi-Fi Plug-In Outlet (DW15P)

Top Pick

9.6/10Editor’s score

Best pick from an electrical-hardware brand

  • Made by Leviton, an established electrical-equipment manufacturer rather than a consumer gadget brand
  • Rated for 15A/1,800W, the same ceiling as a standard household outlet
  • Works with Alexa, Google Assistant, and Apple Home

Watch out Costs more than basic Wi-Fi-only plugs, and setup leans on Leviton's My Leviton app rather than a more widely used smart home app.

Check price on Amazon

Kasa Smart Plug KP125

Runner-up

9.3/10Editor’s score

Best for confirming the appliance's real wattage draw

  • Real-time energy monitoring shows exactly how many watts the heater or AC unit is actually pulling
  • Rated for 15A/1,800W with a track record of reliable relay performance
  • Works with Alexa, Google Assistant, and Apple Home

Watch out Energy monitoring data lives in the Kasa app, which is one more app if the rest of your home runs on a different ecosystem.

Check price on Amazon

BN-LINK Smart Wi-Fi Heavy-Duty Plug

Best Value

9.0/10Editor’s score

Best explicitly heavy-duty-marketed pick

  • Marketed specifically for space heaters, window AC units, and other continuous high-wattage appliances, not just lamps
  • 15A/1,800W rating listed clearly on the product spec sheet
  • Simple scheduling and voice control through Alexa or Google Assistant

Watch out Smaller brand than TP-Link or Leviton, with a more bare-bones app and fewer smart home integrations.

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Eve Energy

Also great

8.7/10Editor’s score

Best for local, no-cloud control

  • Native Thread/Matter support means on/off commands run locally instead of round-tripping through the cloud
  • Rated for 15A/1,800W with built-in energy monitoring to track the appliance's draw
  • No separate hub required for Apple Home users with a HomePod mini or Apple TV acting as a Thread border router

Watch out Costs more than basic Wi-Fi plugs, and Thread's local-control benefit is smaller if you don't already have a Thread border router running.

Check price on Amazon

Amazon Smart Plug

Also great

8.4/10Editor’s score

Best simple pick already rated for a full-size appliance

  • Rated for 15A/1,800W out of the box, with no 'heavy duty' upsell needed
  • Extremely easy setup through the Alexa app
  • Reliable connection history with minimal dropouts

Watch out No energy monitoring, so you can't confirm the appliance's actual wattage draw from the app the way you can with Kasa or Eve.

Check price on Amazon

Frequently Asked Questions

Is it actually safe to run a space heater on a smart plug?
It can be, as long as the plug explicitly lists a rating that covers the heater's wattage (most 1,500W heaters draw 12.5A, under a 15A/1,800W plug's ceiling) and you're not daisy-chaining it through an extension cord or power strip. Also check the heater's own manual — some manufacturers specifically advise against any smart plug, timer, or power strip for safety reasons, which overrides anything the plug's rating allows.
What wattage can a standard smart plug actually handle?
Most current smart plugs, including every one in this roundup, are rated for 15A/1,800W, matching a standard U.S. household outlet. The main risk isn't the published number so much as unrated or off-brand plugs that don't list a clear rating at all — skip those for anything beyond a lamp or small electronics.
Does energy monitoring actually help with a heater or AC unit specifically?
Yes — it's the most direct way to confirm the appliance is drawing what its label claims rather than something unexpectedly higher, and it lets you see at a glance whether it's cycling on and off normally or running continuously longer than expected.
Should I use a smart plug or a smart in-wall outlet for a window AC unit?
A plug-in smart plug is the simpler choice for most renters and homeowners, since it needs no wiring and moves with you. A hardwired smart in-wall outlet is worth considering only if you're already doing electrical work in that room, since it otherwise adds cost and complexity a plug-in model doesn't.

Keep reading

Category

Smart Plugs Buying Advice

Guide

How to Monitor and Cut Energy Usage With a Smart Plug

Guide

Smart Plug Won't Connect to Wi-Fi? How to Fix It