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Model #LW1221HRSM

Store SKU #1005820093

12,000 BTU 230/208-Volt Window Air Conditioner LW1221HRSM with Cool, Heat and WiFi in White

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  • Cools medium rooms up to 450 sq. ft. (18' x 25’ size)
  • 12,000 BTU Cooling / 11,500 BTU Heating
  • Works with LG ThinQ, Amazon Alexa and Hey Google
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Product Overview

Image of a room with a portable air conditioner, woman's hand holding smartphone using LG ThinQ app, Hey Google and Alexa logos

Control Your Cool From Anywhere

With the LG ThinQ app, control your air conditioner from anywhere using your smartphone, Hey Google or Amazon Alexa.

Closeup of LED control panel and remote control

Maximum Usability

User friendly LED display and simple selection control panel with full-featured remote.

Window air conditioner showing cold air flow on one side and hot on the other in a room with a sofa that is blue on on side and beige on the other

Maximum Cooling and Heating

LG window air conditioners provide powerful cooling and heating. Stay comfortable in any climate with our advanced technology.

Icon of fan representing multiple fan speeds

Multiple Cooling/Heating Speeds

Control the temperature of the room with our multiple heating and cooling options.

Icon of clock that says 24H

24-Hour On/Off Timer

Set up to 24 hours of operation to turn unit on or off automatically.

Icon of start button with circular arrow

Auto Restart

Automatically turns the unit back on when power is restored after an outage.

Icon of instructions, measuring tape and screwdriver

Easy to Install

Installation kit provided for quick and easy setup.

Icon of 230-volt outlet that says 230 volt, 20 amp

Plug Type

Works with a standard 115-volt outlet.

Icon saying 1 year parts and labor limited in-home service warranty


One Year Limited Parts & Labor Warranty

The LW1221HRSM is the SMART way to keep your house feeling comfortable no matter what the weather is like outside! LG ThinQ technology lets you control your air conditioner with your phone or use with Amazon Alexa and Hey Google to have control with the sound of your voice. This unit ideal for cooling medium rooms up to 550 sq. ft. and you can even add a bit of warmth on cooler days with the supplemental heat option. With 2 cooling and fan speeds and a 24 hour timer you can create the perfect cooling schedule. 4-way air deflection lets the flow of air be directed where it's needed most whether cooling, heating, dehumidifying or just circulating air. If there is a power outage, the auto restart feature will automatically turn your unit back on when power is restored. Other features include a remote control, easy window installation kit, removable, washable filter and a check filter alert.
  • 12,000 BTU cooling / 11,200 BTU heating
  • Estimated cooling area: 550 sq. ft. / Room size: 18 ft. x 25 ft.
  • Smartphone control with LG ThinQ technology.
  • Voice control works with Amazon Alexa or Hey Google
  • User friendly digital control panel and remote control
  • Fits window openings: 27"-39"W x 16"H
  • 2 cooling/heating and fan speeds
  • 4-way air deflection
  • User friendly digital control panel and remote control
  • 24-hour on/off timer
  • Power failure auto restart
  • 4 in 1 operation: Cool/Heat/Fan/Dry
  • Removable, washable filter
  • Filter light reminder
  • Slide in-out chassis for easy installation
  • Window installation kit included
  • 230-Volt LCDI Plug (NEMA 6 - 20)
  • Product dimension (W x H x D): 22-1/16 in. x 14-31/32 in. x 23-5/8 in.
  • Power cord length: 52
  • Click here for more information on Electronic Recycling Programs
  • California residents

Info & Guides

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Product Depth (in.)
22.05 in
Product Height (in.)
14.96 in
Product Width (in.)
23.62 in
Window opening maximum height (in.)
Window opening maximum width (in.)
Window opening minimum height (in.)
Window opening minimum width (in.)


Air Conditioner Features
Filter Light Reminder,Timer,Wi-Fi Enabled
Air Conditioner Product Type
Window Unit
Air direction/circulation
Amperage (amps)
Appliance Category
A/Cs and Fans
BTU Cooling Rating (ASHRAE)
12000 BTU
BTU Cooling Rating (DOE SACC)
12000 BTU
BTU Heat Rating
12000 BTU
Color Family
Combined Energy Efficiency Ratio (CEER)
Control Type
Fan Control,Remote Control
Cooling Area (Sq. Ft.)
Decibel (Sound) Rating
51 dBA
Decibel Rating
51 dBA
Energy Efficiency Ratio (EER)
Filter Type
Heater Included
With Heater
Remote Control,Window Panels
Number of cool settings
Number of Fan Speeds
Pack Size
Power Options
Product Weight (lb.)
92 lb
Remote Access
Remote Access
Requires Hub?
No Hub Required
Smart Home
Smart Home Enabled
Smart Home Protocol
Voice Control Hub Required
No Hub Required for Voice Control
Voltage (volts)
Wattage (watts)
Window Type
Double Hung,Single Hung
Works With
Alexa, Alexa, Google, Google Assistant, SmartThinQ

Warranty / Certifications

Certifications and Listings
FCC Listed,UL Certified
Manufacturer Warranty
Limited 1yr parts and labor

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.5
    out of 101 reviews
  • 88% recommend this product
Filter by:
Showing 1-10 of 101 reviews
Excellent cooling solution for small rooms with window access.
Easy instal for two people with basic mechanical skills. Cools 550 square foot garage very quickly. Much cheaper than split system and no holes to drill in exterior walls.
  • Verified Purchase
  • Recommended
Tough little unit.
[This review was collected as part of a promotion.] Due to the fact that it needed a 240 V plug, I needed to get some help from an electrician to get it in. But once it was properly installed, it blows out insane amounts of cool air. Cooled down the living room, kitchen, and front and back doors very effectively. More than great to have to help deal with a typical Texan summer. The heating option is also extremely nice. Unit runs very quiet, too, and easy to set the wi-fi controls up. This does the job in cooling/heating up to 500 sq foot of area, definitely recommending!
    • Recommended
    230 Volts Needed
    [This review was collected as part of a promotion.] I had initially hoped to replace an old window unit with the LG LW1221HRSM but failed to notice the requirement for a 230 V outlet. Our old unit used a 120 outlet. The side of the box lists 4 things to check, with this being the last. If you do not have a plug that looks like the picture below, it will not work. That said, we found another use for it, and the room size more compatible to the recommendations. The installation kit that comes with it is great, we just needed to add some of our own double sided tape as the one included didn’t stick. One person is able to install the outer “box” and window kit by themselves but since the unit weighs 90 lbs., it is best to have two people to slide it into the box. There are many levels of cooling and heating available and it is great to be able to turn it on remotely, usually an hour before we will be using the room!
      • Recommended
      Modern AC/HEAT
      [This review was collected as part of a promotion.] I needed a new larger AC unit and this LG fit what I was looking for. A couple of things to know before you buy: It weighs almost 100 pounds in box, AND You will need a 240 V plug. It comes packaged really well but is easy to unpack. It comes with all the installation parts you need, but not tools. It was a relatively easy install with clear directions in the manual that came with it. Once operational, there were many different options to choose how to run it. I chose the Energy Saver mode, and it cycles on and off to keep the room at the temperature which was 70 in my case. It has a delay timer, but my AC runs all the time as I live in Florida. It keeps my house very nicely cool. I love the remote, so if I want to change the modes or fan speeds, I can do that without getting up and going over to the unit. The LG AC does have a WiFi connection. To use it I downloaded the app "LG ThinQ" and from the app, you can connect the AC to your smartphone. The front panel has a filter light, which will come on when it needs cleaning. The front opens UP for easy access to the filter. I just brush mine off with a brush. This LG overall is a very modern appliance and the look is compact, sleek, and stylish.
        • Recommended
        Great Product!
        [This review was collected as part of a promotion.] I was so excited to get this air-conditioner for my bedroom. The installation was very easy. I have been wanting me one with both cooling and heating for along time now. This is really easy to operate. It also comes with a remote control which I really like. It cools my bedroom in no time I had to put it on energy saver. With it continuously running it got to cold. So after it cooled off outside I tried the heating. Oh man I'm gonna love this, this coming winter. It really puts the heat out. I'm really impressed about this LG cooling/heating system. I'm hoping it will last my family and I for years to come. You won't be disappointed in this brand or unit.
          • Recommended
          It's the best
          This is the best air-conditioning I have ever owned in my life it gets super cold an the I love the heat this unit provides also it's built with only the best LG really knows how to make their products they spare no expenses when it comes to pleasing their customers. I highly recommend to others to buy this unit it's by far the best ac an heat unit I have ever seen.
            • Recommended
            3 people found this helpful
            Air conditioning does not have enough poop to do my...
            Air conditioning does not have enough poop to do my little room the heater I have not figured out yet but seems to be adequate
              Works great! cools and heats my 250sq foot studio perfectly...
              Works great! cools and heats my 250sq foot studio perfectly
                  Had trouble removing unit from housing....
                  Had trouble removing unit from housing.
                    Showing 1-10 of 101 reviews