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3.8 | 29 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

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.

3.8 out of 5

65% of reviewers recommend this product.

2 Stars

Not so great

Bill from Texas 11/8/2022

The AC unit was a nice size with great features like the Wi-Fi control from a phone app. It cooled and heated well for 11 months then the AC froze up and leaked all over the floor. I contacted LG and they had no one to service the unit in the central Texas area so they refunded the purchase price after a month and hours on the phone with customers service.
Originally posted on lg.com

No, I do not recommend this product

Features

 

Quality

 

Value

 
5 Stars

LG 18000 BTU Air Conditioner

Noucee06 11/6/2022

I purchased this AC unit because summers are hard on HVAC in Houston Texas and it has done more than the job intended. We have to turn it off because it chills the back of my home so well....love it
Originally posted on lg.com

Yes, I recommend this product

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Value

 
5 Stars

This machine has it all.

woody lucas 11/6/2022

It does everything you are looking for. Heat..air ..wi-fi ..google talk .It helps the regular house system wit the utility bill .The price is just amazing when you consider it is all wrapped up in one machine.
Originally posted on lg.com

Yes, I recommend this product

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Value

 
5 Stars

Has been the coolest cool for the summer

Gfloyd 10/15/2022

Bought for a mobile home and it is doing its job. Simple to operate.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

LG Air conditioner

Tbird1949 10/10/2022

It has been a good air conditioner. It replaced not just another air conditioner but also a space heater. When I first got it I wasnt sure I had made the right choice. I did. Very happy with the LG Air conditioner and heater.
Originally posted on lg.com

Yes, I recommend this product

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Quality

 

Value

 
1 Stars

LG AIR/HEAT

LG LW1821HRSM 10/3/2022

THIS PRODUCT DID NOT WORK AND I WAS CALLING FOR 6 MONTHS AND COULD NOT GET HELP TO HELP IT
Originally posted on lg.com

No, I do not recommend this product

Features

 

Quality

 

Value

 
5 Stars

Excellent cooling

eskye 9/11/2022

We bought this and installed it ourselves. It keeps our 752 sq ft home super cold and has helped immensely with humidity issues as well. Have had some trouble hooking it up to ThinQ but otherwise it has been a super solid investment so far.
Originally posted on lg.com

Yes, I recommend this product

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5 Stars

Love the way it is designed

Susan Dixon 8/20/2022

I Love my new LG window unit its more than I expected.
Originally posted on lg.com

Yes, I recommend this product

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5 Stars

The Real deal

Chilly butt 8/18/2022

Very happy easy install works awesome get the extended warranty its worth it
Originally posted on lg.com

Yes, I recommend this product

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5 Stars

Excellent Unit

larryd1253 8/17/2022

Bought this for my daughter and is she ever happy This unit is cooling the entire kitchen and living area in her home Its easy to operate and she just loves it
Originally posted on lg.com

Yes, I recommend this product

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Quality

 

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4 Stars

Great features Especially the ThinQ feature

CKP1 8/15/2022

Got this AC about a month ago. Our central air went out and couldnt afford to replace it at this time. Man it is really hot in TX right now so we got this LG 18000 BTU model. It is definitely a downgrade from central but it keeps the living room and kitchen cool. We use smaller models for the bedrooms. I love the ThinQ app. We travel frequently. I love that we can set schedules to turn iit on and off. We turn it off when we leave schedule it to come on on the AM that we are returning. Nice and cool to come home to. You can also adjust temperature mode and fan speed. Love it
Originally posted on lg.com

Yes, I recommend this product

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Quality

 

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4 Stars

apriljohnson173 8/8/2022

I recently bought this ac unit which was the second one in a year and 2 weeks. I just hope this one last longer than the first one did cause I cant afford to buy one every year for I am a single mother on a single income
Originally posted on lg.com

Yes, I recommend this product

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5 Stars

Best window unit yet

RobR1951 7/25/2022

I bought this unit almost 3 weeks ago after my old unit compressor started going out during 100+ degree weather. It couldnt keep out living room cool at 68. This new bigger unit keeps our living room dining room kitchen very comfortable at 75 - 77 with the same 100+ temps outside. I can only imagine how much warmer we will be this winter.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Great Air Conditioner

Big Elvis 7/18/2022

I bought this on July 3rd and have been enjoying it ever sense have not tried the heater but if it does the job all will be good
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

Awesome product

Willp 7/11/2022

Bought this as an emergency buy for my mother in law with it being 104 outside and its helping keep her house at around 70.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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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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Quality

 

Value

 
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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Value