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814 Romeria Dr., Austin, TX 78757

LG Logo

15,000 BTU Smart Wi-Fi Enabled Window Air Conditioner

Model # LW1521ERSM

 4.5 out of 5 (10 Reviews)

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Maximum Cooling

LG window air conditioners provide exceptional cooling power that will keep you and your family cool comfortable, and in control.

Control Your Cool from Anywhere

Control key air conditioner features from your phone or favorite smart speaker with the ThinQ app.

Quiet Operation

LG window air conditioners operate at sound levels as low as 57dB (when in low mode) eliminating unnecessary noise for smooth operation that you'll barely notice.

Maximum Usability

Operate with LED display and simple selection control panel, up/down temperature adjustments, and fan speed selection, using the full-featured remote without leaving your bed, workspace, or couch.

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 Reminder

The Clean Filter LED lights up to notify you that the filter needs to be cleaned.

Slide-out Washable Filter

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

Made to Perfection

LG window air conditioners add powerful performance and stable durability to perfectly match your window frame.


  • 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
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

Extended warranties are usually very inexpensive and can save you thousands in the future. Some can even cover extra costs that result, such as cost of food that spoils when your fridge dies. It's simple and inexpensive to purchase extended warranties and one of the smartest ways to protect your investment.

Appliances can be large, heavy, and expensive and you probably don't have the special tools or expertise needed to fix them in a crisis. If you can spare a few thousand dollars without batting an eyelash for new appliances should they break tomorrow, don't buy a warranty. But if you're like most of us, protect yourself by purchasing inexpensive extended warranties when you buy a new product and save yourself big money in the long run.

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out of 5 (10 Reviews)

90% of reviewers recommend this product.

Love my new ac

Submitted by chung710 - 10/12/2021

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.
Originally posted on

Yes, I recommend this product

Gift box Incentivized Review

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As good as central air

Submitted by Mels44 - 10/6/2021

I got this air conditioner to cool our three car garage off while my husband works on things out there. Its 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 its 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
Originally posted on

Yes, I recommend this product

Coldest air ever

Submitted by TRABUX - 10/4/2021

What a satisfying comfort level in our home. This LG Electronics unit cools the while bottom floor in our house. It is powerful and emits 15000 BTU per hr. It has 3 cooling speeds is energy efficient and has an easy to use remote control . Even the window kit is included. The unit will automatically come back on after a power failure and cools a room size 800 square feet. Fits window size of 29x 41x 19. We couldnt be happier with this unit and fully trust LG products. It runs fairly quiet isnt loud and annoying like some other AC units run.We couldnt be happier with our new LG Air conditioner and highly recommend this product.
Originally posted on

Yes, I recommend this product

Awesome Unit

Submitted by Shellysig - 9/24/2021

This unit is powerful and easy to use. It has great functionality and the WiFi capabilities. It it the perfect size and 15000 BTU keeps everything cool It easily adjusts to our window size and firmly in place.
Originally posted on

Yes, I recommend this product

After one day unit quit working.

Submitted by Stevr - 9/24/2021

Bought this unit for a rental and it stopped working one day after installation. Called service and very disappointed in them so far. Unit still not repaired.
Originally posted on

No, I do not recommend this product

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Great Air Conditioner

Submitted by Mom2two - 9/21/2021

The LG LW1521ERSM Air Conditioner is wonderful unit. We installed in our kitchen since it gets hot there more than any room in the house. Even hotter when we are cooking for family get together. This solves out issue. The LG LW1521ERSM is very easy to install. We followed the instruction step by step. This unit fits in our regular sized window. It is just the right size. It does not require any additional brace or bracket for the outside. Everything you needed is included. Operating this air conditioning is pretty simple. You can either use the control panel on the unit use the remote or connect it to your Alexa or Hey Google so you can just talk to it. Thats pretty high tech if you ask me. The operation is very quiet. It is also a good looking air conditioner. Overall we really like this air conditioner. It is perfect for our kitchen and most of all it is ENERGY STAR Certified which is very important to us. We highly recommend it.
Originally posted on

Yes, I recommend this product

Excellent air flow

Submitted by Hank1973 - 9/18/2021

I strongly recommend you take the advice of the manufacturer and measure the room you are installing this in to ensure you get the right BTU capacity. This 15000 BTU air conditioner is perfect for my workshop building. In Texas I needed something after getting baked for 15 summers in a row. Fans just dont cut it. This unit makes quick work of cooling down my workshop before I go in there. The wifi capability allows me to adjust the settings before stepping foot out of my living room. Having a mobile app and the ability to work with Alexa makes this one of the smartest investments I have made in my tools. Installation is fairly simple but if you get a larger unit you will need help getting it into position as this thing is sizeable and heavy. I also like the washable filter. We have a LOT of pollen and dust here so knowing I wont be buying replacement filter every month was one of the deciding factors in this unit. Mine came via freight delivery and arrived on time and in great shape.
Originally posted on

Yes, I recommend this product

Love this AC

Submitted by Bpace5569 - 9/17/2021

This AC is absolutely AMAZING. It cools down so fast. It is not loud at all. It is energy efficient. It cools down practically my whole house just being in the living room window. I will be getting another for my husbands shop. Must buy
Originally posted on

Yes, I recommend this product

Great product

Submitted by Nwood08 - 9/9/2021

I am really excited about this product. When I first got it I was skeptical on if it would really work up to the performance level it suggested but it most certainly did. Im actually going to buy another unit to put in another home I have because it works out well. I would highly recommend it to anyone.
Originally posted on

Yes, I recommend this product

So far so good

Submitted by CMNYC - 7/23/2021

Seems to cool well and quickly. I needed one that would cool two rooms separated by a doorway total about 750 sq feet and this seems to fill the bill. Some found noisy its about typical to me not super quiet which specs made it sounds it might be but no matter. Its big fills window. My favorite feature is the dry setting taking humidity out of air rather than reducing the temperature you can set the temp too which is a more efficient setting apparently. Maybe most new ones have this but Id never heard of it and really appreciate that feature.
Originally posted on

Yes, I recommend this product

Gift box Incentivized Review

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