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4.1 | 34 Reviews

18,000 BTU Smart Wi-Fi Enabled Window Air Conditioner, Cooling & Heating

LG LW1821HRSM

Features

  • Cooling:18,000 BTU
  • Heating: 12,000 BTU
  • Estimated Cooling Area: 1,000 Sq. Ft.
  • LG ThinQ® Technology

Quick Specs

  • Type: Air Conditioner
  • Style: Window/wall Air Conditioner
  • Width: 25.5"
  • Height: 16.84"
  • Depth: 30.5"
  • Energy Star Rated: No
  • Cooling Power: 18000 BTUs
  • Heating Power: 12000 BTUs

See More

 
Cooling & Heating

LG window air conditioners provide powerful cooling and heating. Stay comfortable all year long, with our advanced technology.


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.


Made to Perfection

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


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.

Features

  • Cooling:18,000 BTU
  • Heating: 12,000 BTU
  • Estimated Cooling Area: 1,000 Sq. Ft.
  • LG ThinQ® Technology
  • Multiple Cooling/Heating Speeds
  • Easy to Use Electronic Controls
Summary
Type Window Air Conditioner
Air Type Cooling/Heating
BTU 18,000
PERFORMANCE
BTU performance (Cooling) 17,500/18,000
BTU Performance (Heating) 9,800/12,000
EER 11.2
CEER 11.1/11.1
Dehumid. (Pts/Hr) 5.5
Dry Air Flow (CFM) 430
dBA Level (High/Mid/Low/Sleep) 61/57
Est. Cooling Area (SQ.FT) 1000
Room Size 25' x 40'
Fits Windows 29"-41" W x 18" H
ELECTRICAL RATINGS
Voltage / 60 Hz 208/230
Plug Type 208/230/20 Amp
Watts (Cooling) 1,560/1,600
Watts (Heating) 3,100/3,670
Rated Amps (Cooling) 7.8/7.3
Rated Amps (Heating) 15.0/16.0
FEATURES
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) 2 (2)
Fan Only 2
In Door Fan Type Blower
Type Air Discharge Side by side
Outdoor Vent / Exhaust Yes
Chassis Type Slide In-Out
DIMENSIONS/WEIGHTS
Product Height 16.84
Product Width 25.50
Product Depth 30.50
Product Weight (lbs.) 126.5
Shipping Height 21.19
Shipping Width 29.38
Shipping Depth 33.00
Shipping Weight (lbs.) 139.7
Stuffing Quantity (20ft/40ft/40ft High) 84/168/168
Pallet Qty 8
TL QTY w/Pallets 240
TL QTY Floor Loaded 504
COMPONENTS
Cord Length 52''
LIMITED WARRANTY
Parts & Labor 1 Year
UPC CODES
UPC 048231605090

Quick Specs


  • Appearance

  • Type: Air Conditioner
  • Style: Window/wall Air Conditioner

  • Dimensions

  • Width: 25.5"
  • Height: 16.84"
  • Depth: 30.5"

  • Features

  • Energy Star Rated: No

  • Cooling Capacity

  • Cooling Power: 18000 BTUs

  • Heating Capacity

  • Heating Power: 12000 BTUs

Professional delivery and installation is available for every product we sell. We would be happy to coordinate delivery and installation for you.

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. 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.

4.1 out of 5

76% of reviewers recommend this product.

3 Stars

no person has responded to me

beaver brooks 6/13/2022

i purchased a 2nd 18k- the first one died after 24 months no # 2 has a thermostat problems and I ask for help on line and have only received advertisements.
Originally posted on lg.com

No, I do not recommend this product

 Incentivized Review

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1 Stars

LG LW1816HR and LW1821HRSM

TeeMob 5/24/2022

We have purchased both units and neither will get cold. They are both 18000btu units. The heater works in both but the AC only gets fan-cool on 60-68 degrees. I am very disappointed because I thought the 1816HR was just leaking freon. I bought it last year in August. We just bought the 1821HRSM yesterday from Home Depot installed it and waited 4hrs for it to get cold before returning home only to find the house is still the same temperature. The only thing that saved us last night was the fact that we had an overcast all day yesterday. I am so intensely upset and disappointed because I have to pay for pickup and delivery three times now and have wasted money paying an installer.
Originally posted on lg.com

No, I do not recommend this product

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5 Stars

Great product

Tootieman 5/15/2022

Love this product. Its quiet it works really well it cools my kitchen and living room nicely. The auto on and off feature is wonderful. It has an auto swivel also..very nice unit
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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2 Stars

Does NOT get cold

TPCatkit 5/3/2022

Im very disappointed with this product. Even at 69 degrees its only moderately cool. The Wi-Fi feature does not work. I gave it two stars because of the remote and quiet sound.
Originally posted on lg.com

No, I do not recommend this product

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5 Stars

Great product

Christywow 4/23/2022

I bought this product a month ago and I love it. Great product
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Great LG Air Condition

MASP88 4/22/2022

Had to get a new Air Condition and I bought a LG air condition 18000BTU I Sure do like this air condition It runs so much quieter than my old air conditioner which I really like My LG has so many more nice features and looks good in my living room wall So glad I bought a LG air conditioner
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

So far So good

JacquieG 4/19/2022

I bought this ac/heater unit about a month ago and have been satisfied with it so far. I am hoping this is the one the though. Have purchased other ones with same BTU and they only lasted 2 years. Those ones were different brands. So fingers crossed this is the one we have been needing and lasts alot longer than 2 years.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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3 Stars

Why did you change the unit? It doesnt heat now.

Supremely annoyed 3/20/2022

I had a unit previous to this and this one does not work the same. The heater doesnt work well at all. It turns off and on too often. Doesnt work at all like the previous unit. Why did you change it? The heating performs horribly now. Just unbelievably bad.
Originally posted on lg.com

No, I do not recommend this product

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1 Stars

Great features on review of product. Did not perfo

Moore2021 3/2/2022

Does not heat well no resolution yet from LG. Wish they would replace
Originally posted on lg.com

No, I do not recommend this product

 Incentivized Review

1 Stars

Poor heating and cooling

Danny12 2/8/2022

I purchased this in August 2021 at first it cooled nicely and was not very noisy about 90 days later the cooling was not great and it never stopped cycling I called for service and the tech spent maybe 5 to 10 minutes and said nothing was wrong ok next we have some very cool weather in Florida and the unit seemed to barely heat one of the cool day and evening it never stopped running the home did not feel warm oh and that on day/evening electric use was 66 watts Oh once again nothing wrong and after about about 6/7 hours it sounds like a plane engine this is the third LG product I have purchased AND MY LAST they have all been the same great for about 6 months then JUNK GARBAGE
Originally posted on lg.com

No, I do not recommend this product

 Incentivized Review

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2 Stars

too new to tell ???

Happy Days 1/26/2022

summer is not here yet so I cant speak to the A/C but the heating thing does not work and I have a service call in to come and check it out???
Originally posted on lg.com

No, I do not recommend this product

 Incentivized Review

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5 Stars

Texas weather

pappydee 1/3/2022

I am really pleased with my new LG Air conditioner. We have had crazy texas weather for the last week and a half from 80 degree days to 19 degree nights. The LG has kept my shop a comfortable 74 degrees constantly.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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1 Stars

Heater wont stay on all night.

Lynnford40 11/1/2021

Heater keeps cycling on and off all night and keeps me awake. Our Friedrich would.
Originally posted on lg.com

No, I do not recommend this product

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5 Stars

Great product tray is doing exactly what we wanted

Jane1051 9/12/2021

We have a small shed that needs to be heated and cooledthis unit provides both. Havent needed the heat yet but the AC is working wonderfully and appears to be using less energy.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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4 Stars

LG Window A/C Unit

bvhorner54 8/30/2021

So far so good blows cold air not sure about heater yet. Cant get the Wi-Fi system to work but have not called customer service yet.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Second one

Simpleman6200 8/5/2021

This is the second LG air conditioner Ive bought keeps me cool in the summer and helps warm me up in the winter so what more could I ask for
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Awesome and excellent product

Brenda777 8/4/2021

I purchased this air unit to cool a 20 x 20 furnished room. The air unit has been consistent and more than adequate to cool This space and our temperatures have been hotheat index exceeding 100. Ive never been disappointed with LG products. Its my first choice in appliances and for good reason.quality durability efficiency awesome and important features. The remote control option allows me to adjust the temperature and easily turn the unit on and off. I have mobility issues and what a difference this makes for folks like me. Thank you LG for putting the consumer first
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Great features

Rabbit runner 8/3/2021

We bought this t air conditioner with heat to replace one that quit. Were very satisfied with the quality price energy saving features the beautiful white sophisticated cabinet. It really added a beautiful touch to our fellowship hall.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Works very well for my needs.

Margarita Sunshine 7/31/2021

Cools my house down considerably when its really hot outside. Ease to use and maintain.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Best value and well made

Derf73 7/29/2021

Installed easily due to excellent instructions and all parts in the box. Slight heavy for one person installation. Fit perfectly. Does great cooling large room.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Great product

Mae D 7/26/2021

I love the features on my AC unit It has met all of my expectations
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Very quiet and very cool Thank You

Ron_E 7/25/2021

The old unit stopped working in 97 degree temperatures
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Excellent air conditioner and love modern features

Jackie for Jacqueline 7/18/2021

Bought online and pickup convenient and absolutely love this air conditioner
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Great Windows AC

DanielNTX 6/28/2021

Ive never used a window A/C unit before and this easily keeps my bedroom cool. It works better than my home system because its 20-years old and is due for a replacement. I can use my phone and control the temperature. Im already familiar with LG ThinQ app because I use it to control my LG OLED TV. This is a quality product that I recommend if you wanna keep your room cool.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

3 Stars

Complicated - super cold

Angela76 6/21/2021

This is a really complicated window unit with all the bells and whistles. I needed help with setup. It is very large and cools my small space so well. It is big and heavy. Once setup though it is great. Really quiet and so cold. bRrrr
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

5 Stars

The best air conditioning unit

Brittpeebs 6/17/2021

We live in the south. Its running around 90-95 degrees daily. Our home doesnt have a central unit so weve been depending on this unit to keep our home cold. It has performed OUTSTANDING We seriously have to sit with blankets on during the night to sit in the living room where we have it placed. The unit is extremely user friendly. It has a nice sleek design and isnt an eye sore like some window units. The quality is amazing as it is extremely well built and heavy duty We are so in love with this product. It has tremendously helped our family out during these hot summer months. We also enjoy the WiFi compatibility. Its extremely convenient Overall we would HIGHLY suggest this to anyone in the market. It is truly an amazing product
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Great air

AC Dan 6/1/2021

This window unit is a breeze to install. Set it up plug it in and enjoy the air quickly circulating around your room its the coolest Great buy for the hot summer headed our way. Cant stay cool without it.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Super cool

DCS56 5/28/2021

This window HVAC is the perfect solution for us. We have central heat and air but as usual with a two story home the upstairs is hard to regulate. With this unit cooling the three upstairs bedrooms we hardly need to even run the central unit. Operation is smooth and quiet. Looking forward to enabling WiFi so we can remotely turn it on when returning from vacations.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Great Air Conditioner

wbiggers11 5/23/2021

I was looking for a air conditioner that also put out heat. Thats when I discovered this unit. The installation process is very simple and easy to follow directions. The led control panel makes it easy to read. This unit also has a 2 speed fan delay on/off timer up to 24 hours. For each press of the timer button advances the time by 1 hour. There are four mode types for the unit energy saver cool fan and heat. It all can be controlled by the remote as well. Also on the remote and on the unit face it has an auto swing that controls the vertical louver from left to right. Also the a/c unit is wifi capable to a home network of 2.4 GHZ. Our Den and Living room is just alittle over one thousand square feet and it cools these spaces with ease and within minutes. Living the deep south in the summer time this unit is needed greatly and believe it or not during the winter we do have a few very cold nights. If your looking for a great A/C unit this the one for you. My family and I love it
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Incredible Unit

SunlightKnight 5/20/2021

Ive been using this product for a few days now and WOW its absolutely incredible The original packaging was well thought out and very secure. The instructions were easy for me to follow and understand. I did the installation/setup by myself and it only took me a couple hours. I placed this unit in my master bedroom window and I couldnt be happier it cools down in no time at all. Thrilled that this model included a built-in washable air filter to help reduce air pollutants and allergens. I absolutely love the fact that this product can be used anytime of the year as a heater or an air conditioner It also has a Dry mode to help remove moisture from the air which is a massive bonus. The wifi feature is a wonderful touch and works as intended. Being able to connect and control everything from the LG ThinQ app on my smartphone is super convenient and a much appreciated feature. No issues or problems with this product so far and I have zero complaints. Id go as far to say this is hands-down the best window unit Ive ever owned. My final score: easily a 10 out of 10. A must have product
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

5 Stars

This thing is crazy

Sunny girl 98 5/20/2021

To be completely honest i didnt know a product like this existed I have always had issues with window units and i didnt know they could also have a heating element Works like an absolute charm in my garage apartment
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Best ac/heater

Mimi1973 5/19/2021

Im so used to the older ACs that I am spoiled with this one. It cools my house like a charm. I love that it is AC and heater in one. I also love that it is a smart one I can control it from my phone. I just love everything about this AC. It was very easy to install and set up. I would recommend this LG AC to anyone
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Amazing

Patty86 5/18/2021

The LG window unit is completely amazing. It can work through wifi so you can control it from your phone. We love how fast it cools our unclosed porch down. This is a great product. We cant wait to use the heat feature in the winter
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

5 Stars

A lot of cooling/heating power.

Baby090899 5/18/2021

I set up this air conditioner in my newly remodeled design room. I wanted a unit with enough power that would cool or heat the entire building easily and I was not disappointed with this LG window unit. It was easy to install and it it puts out a lot of power without the noise. It is a heavy unit so you will need more than one person to help and exterior support brackets but other than that this is a great product just make sure you keep the filter clean. The fact that its WiFi enabled made me choose this one in particular. Im very pleased so far with this air conditioner/heater.I live in Florida so I havent tried out the heat part yet but Im sure it will be just as good as the cold air .
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review