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  • Cooling: 15,000 BTU
  • Estimated Cooling Area: 800 Sq. Ft.
  • LG ThinQ® Technology
  • 3 Cooling and 3 Fan Speeds With Auto Cool
  • Easy to use Electronic Controls
  • Automatically Restarts After Power Failure
15,000 BTU Smart Wi-Fi Enabled Window Air Conditioner
$ 519.00

Easy Installation

LG window air conditioners are designed for easy and efficient installation and come with a washable and resusable air filter. Before buying an air conditioners, measure your room to find out how many BTUs you need.
Room Size (Sq. Ft.) 150 (10'x15')
BTUs/hr up to 5,000
Room Size (Sq. Ft.) 260 (13'x20')
BTUs/hr 6,000
Room Size (Sq. Ft.) 280 (14'x20')
BTUs/hr 7,000
Room Size (Sq. Ft.) 340 (17'x20')
BTUs/hr 8,000
Room Size (Sq. Ft.) 450 (18'x25')
BTUs/hr 10,000
Room Size (Sq. Ft.) 550 (22'x25")
BTUs/hr 12,000
Room Size (Sq. Ft.) 800 (25'x32')
BTUs/hr 15,000
Room Size (Sq. Ft.) 1,000 (25'x40')
BTUs/hr 18,000
Room Size (Sq. Ft.) 1,300 (33'x40')
BTUs/hr 22,000
Room Size (Sq. Ft.) 1,560 (39'x40')
BTUs/hr 24,000
Installation Kit1

Installation Kit

This window unit comes with our simple and convenient installation kit so you can set up your air conditioner with ease.
Filter Check Reminder1

Filter Check Reminder

The Clean Filter LED lights up to notify you that the filter needs to be cleaned.
Slide-out Washable Filter1

Slide-out Washable Filter

Maintenance is easy: simply remove the filter and wash it.
Modern Design

Made to Perfection

LG window air conditioners add powerful performance and stable durability to perfectly match your window frame.
  • 24-hour On/Off Timer

    Up to 24 hours of operation time can be set, so that your air conditioner turns off when you plan it to.

  • Multiple Fan Speed

    Low or high 2-way adjustment.

  • Auto Restart

    If the power cuts off, your unit resumes its previous operation shortly after the power is restored.

Warranty / Certifications


    • Type
    • Window Air Conditioner
    • Air Type
    • Cooling
    • BTU
    • 15,000


    • BTU performance (Cooling)
    • 15,000
    • EER
    • 11.9
    • CEER
    • 11.8
    • Dehumid. (Pts/Hr)
    • 3.3
    • Dry Air Flow (CFM)
    • 505
    • dBA Level (High/Mid/Low/Sleep)
    • 61/59/57
    • Est. Cooling Area (SQ.FT)
    • 800
    • Room Size
    • 25' x 32'
    • Fits Windows
    • 29'-41" W x 19" H


    • Voltage / 60 Hz
    • 115
    • Plug Type
    • 115Volt/15Amp
    • Watts (Cooling)
    • 1,260
    • Rated Amps (Cooling)
    • 11.8


    • Wi-Fi Connection
    • Yes
    • Thermostat Control
    • Thermistor
    • Air Diflection
    • 4-Way
    • Remote Controller
    • Yes
    • Auto Restart
    • Yes
    • Energy Saver Function
    • Yes
    • Timer
    • 24 Hr, On/Off
    • Filter Alarm Function
    • Yes
    • Fan Speed: Cooling (Heating)
    • 3
    • Fan Only
    • 3
    • In Door Fan Type
    • Turbo
    • Type Air Discharge
    • Top Discharge
    • Outdoor Vent / Exhaust
    • Yes
    • Chassis Type
    • Slide In-Out


    • Product Height
    • 17.68
    • Product Width
    • 25.98
    • Product Depth
    • 28.11
    • Product Weight (lbs.)
    • 112
    • Shipping Height
    • 22.44
    • Shipping Width
    • 29.13
    • Shipping Depth
    • 30.51
    • Shipping Weight (lbs.)
    • 127
    • Stuffing Quantity (20ft/40ft/40ft High)
    • 135/300/300
    • Pallet Qty
    • 3
    • TL QTY w/Pallets
    • 90
    • TL QTY Floor Loaded
    • 240


    • Cord Length
    • 72''


    • Parts & Labor
    • 1 Year


    • UPC
    • 048231605045

What people are saying

Rated 5 out of 5 by from Cools the first floor I wanted a new AC to replace my existing one. It wasn't cooling anymore when the temps got really high during a heat wave. This is a strong AC and was able to cool the entire first floor of the house with no problems. It was definitely a step up. Runs relatively quiet so it doesn't interfere with anything else. I love that it is connected to wifi so can control it from anywhere. I like using the timer feature to set how long I want it run. Sometimes I only needed it to run for a few hours and the timer helped so I didn’t have to remember to turn it off. It is a bit heavy so I suggest at least 2 people to install.
Date published: 2021-11-03
Rated 5 out of 5 by from Love my new ac I have been in need of a new window ac for a while. After setting the AC up and using it for the first time this is exactly what I needed. Strong air flow that almost feels like I have central ac and its wifi enabled so i can control from anywhere. I wish it was a little quieter but otherwise its perfect.
Date published: 2021-10-12
Rated 5 out of 5 by from As good as central air I got this air conditioner to cool our three car garage off while my husband works on things out there. It's such a large space I assumed it would make things more comfortable on really hot days. But this thing actually cools the entire garage off. It gets cold in there! My husband loves the that it's wifi enabled to control it with Alexa in addition to the remote control and I love that it has a washable filter. The 24 hr timer comes in handy!
Date published: 2021-10-07
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Ask your questions. Share your answers.
Please review the detailed product information and help guides in the
Product Support section for this product prior to posting a question.

What type of brace will be strong enough to hold this in a window? Does LG sell one?

Asked by: Freshness628
Unfortunately, LG does not make a support bracket for the LG 15,000 BTU Smart Wi-Fi Enabled Window Air Conditioner, Model # LW1521ERSM, or for any of our Window Air Conditioners. A support bracket that will be strong enough to hold this window air conditioner in a window will have to be one that can support the air conditioner's weight. The air conditioner weighs 112 lbs and you can find support brackets online or from retailers that sell air conditioners that will support up to 165 lbs...^Ivan
Answered by: Ivanf
Date published: 2022-04-22

What kind of plug is on this unit? A 110 or a 220? 

Asked by: Baez1005
The LG 15,000 BTU Smart Wi-Fi Enabled Window Air Conditioner, Model # LW1521ERSM has to be plugged into a standard 120V, 3-wire grounding receptacle rated at 15 A, 120V, 60Hz. protected by a 15 A time-delay fuse or a 15 A circuit breaker. There is no real difference between 110V and 115V circuits. Outlets in your home are standardized to 120V, but due to a number of factors like line length and distance from the grid, you may only get 110V to 115V. In practice, this makes no real difference in how you can use the outlet. A 110v power supply is the same as a 120v power supply. The terms are used interchangeably because the difference between them is too small to matter...^Ivan
Answered by: Ivanf
Date published: 2022-05-01
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