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Multi-generational family owned and operated
Delivery, installation, and haul away available
Servicing all residential brands

4.0 | 25 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

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Cooling & Heating

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

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Made to Perfection

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

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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.

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Quiet Operation

LG window air conditioners operate at sound levels as low as 50dB (when in low mode) eliminating unnecessary noise for smooth operation that you'll barely notice.

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Control Your Cool from Anywhere

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

Cooling & Heating LG window air conditioners provide powerful cooling and heating. Stay comfortable all year long, even in extreme climate, with our advanced technology.

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

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.

Quiet Operation LG window air conditioners operate at sound levels as low as 50dB (when in low mode) eliminating unnecessary noise for smooth operation that you'll barely notice.

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

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
COMPONENTS
Cord Length 52"
DIMENSIONS/WEIGHT
Fits Windows 29"-41" W x 18" H
Net Weight (lbs.) 126.5 lbs
Product Depth 30.5"
Product Height 16.84"
Product Width 25.5"
Shipping Depth 33"
Shipping Height 21.19"
Shipping Weight (lbs.) 139.7 lbs
Shipping Width 29.38"
ELECTRICAL RATINGS
Plug Type 208/230/20 Amp
Rated Amps (Cooling) 7.8/7.3
Rated Amps (Heating) 15.0/16.0
Voltage / 60 Hz 208/230V
Watts (Cooling) 1, 560/1, 600
Watts (Heating) 3, 100/3, 670
FEATURES
Air Deflection 4-Way
Air Discharge Type Side Discharge
Auto Restart Yes
Chassis Type Slide In-Out
Energy Saver Function Yes
Fan Speed Heating 2
Fan Speed Only 2
Filter Alarm Function Yes
Indoor Fan Type Blower
Outdoor Vent / Exhaust Yes
Remote Control Yes
Thermostat Control Thermistor
Timer 24 Hr, On/Off
Wi-Fi Connection Yes
PERFORMANCE
BTU Performance 18, 000
BTU performance (Cooling) 17,500/18,000
BTU Performance (Heating) 9, 800/12, 000
CEER 11.1/11.1
dBA Level (High/Mid/Low/Sleep) 61/57
Dehumid. (Pts/Hr) 5.5
Dry Air Flow (CFM) 430
EER 11.2
Est. Cooling Area (Sq. Ft.) 1000
SUMMARY
Air Type Cooling & Heating
Type Window Air Conditioner
UPC CODES
UPC 048231605090
WARRANTY
Parts & Labor 1 Year
AIR CONDITIONER THINQ® SMART FEATURES
ThinQ® Smart Technology Yes

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

Specifications Sheet

Energy Guide

Owner's Manual English 3,987K 05/27/2022

Owner's Manual Spanish 3,959K 05/27/2022

Get Adobe Reader

* Documents require Adobe Reader.

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.

4.0 out of 5

76% of reviewers recommend this product.

4 Stars

does what I needed done cooling and heating

Sprigs 6/10/2024

I bought this ac about 2 weeks ago I had one exactly like it but didnt last a year but I bought the same exact one because when it works its great heating and cooling
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

1 Stars

Wouldnt Recommend

Kristin71 5/5/2024

Worked well to start but compressor went out a few weeks ago. Communication between LG authorized technician and LG service department is atrocious. Technician not able to get authorization to fix and I had to file a complaint with LG and am still waiting for the ac/heater to either be fixed or replaced.
Originally posted on lg.com

No, I do not recommend this product

Features

 

Quality

 

Value

 
3 Stars

Great for air. Not for heat.

Brock Hamilton 12/12/2023

2.5 star. Simply because this ac unit doesnt do its intended job. The heater went out within a few months on this product. Its freezing in our home and this is our main source of heat. We have bought small space heaters to help we cant get anyone to help us fix it and our landlord refuses to replace it since the air conditioner part works fine. And I absolutely cant find a filter replacement.
Originally posted on lg.com

No, I do not recommend this product

 Incentivized Review

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5 Stars

Great product overall

Hannah2714 11/20/2023

I love this It is so powerful. So easy to control with your phone which makes it more convenient.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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Quality

 

Value

 
5 Stars

L G LW1821HRSM 11/1/2023

I brought this air condition 1year 3 month and its already broke im not satisfied at all
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Works Perfect

Byron Williams 10/23/2023

I bought for a classroom and it works wonders. Classroom now has air and heat.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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Value

 
1 Stars

LG 111 10/22/2023

wi-fi does not work and this is after on hold for several hours it still doesnt work
Originally posted on lg.com

No, I do not recommend this product

 Incentivized Review

5 Stars

Its OK

Fishing 10/15/2023

Too noisy if I wouldve known I would have not bought this AC unit is too noisy at night is hard to sleep
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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5 Stars

LOVE THIS PRODUCT

JEJRLJ 10/14/2023

This makes our fourth ac unit over the years for 2 separate houses and we love them.
Originally posted on lg.com

Yes, I recommend this product

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5 Stars

Awesome

Fishing LG 9/17/2023

This is an awesome unit. Quiet It cools very well I will buy another one if I have to. Thank you.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

5 Stars

Super cold

Charlam 8/30/2023

Installation was a breeze. The output is fabulous. We only run it on fan speed low. It cools our florida room and camper with no problems. Perfect for Floridas hot summers.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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Quality

 

Value

 
5 Stars

Work horse

Mac55 8/23/2023

Ive had this two weeks now. Temperatures here in east Texas have been 105 to 109 each day. This unit under these adverse conditions has performed flawlessly. Im impressed so far. Hope this unit last a long time.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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4 Stars

good features

jimac 8/10/2023

Purchased recently to replace old unit. I am reasonable pleased with the unit features but the unit is a little louder than expected.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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Quality

 

Value

 
5 Stars

Cold AC 8/7/2023

The air conditioner works very well. Cools and heats exactly as featured.
Originally posted on lg.com

Yes, I recommend this product

Features

 

Quality

 

Value

 
1 Stars

I didnt like the service with my extended guarant

Maria Perez 7/13/2023

I bought this item almost four years ago and suddenly stopped to work.
Originally posted on lg.com

No, I do not recommend this product

Features

 

Quality

 

Value

 
5 Stars

Strong powerfulquite

Rafter B Ranch 7/6/2023

Great cooling in a portable building not so good insulation in the West Texas sun Amazingly quite After much research I selected this LG unit and Im sure glad I did. Loaded with features easy to install I am so far 100 satisfied.
Originally posted on lg.com

Yes, I recommend this product

Features

 

Quality

 

Value

 
5 Stars

Great buy

Bulldog59 7/6/2023

I love it. The E-saver function is great. Once I figured out that I could connect to the A/C by WiFi and got it setup I love it even better. I have it in a sunroom that I dont need it on all the time it is great to be able to program it to come on and shut off.
Originally posted on lg.com

Yes, I recommend this product

 Incentivized Review

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Quality

 

Value

 
5 Stars

Window AC

Kristy oroville 6/11/2023

I bought this just in time of warm weather. This is my second unit which lasted 16 years.
Originally posted on lg.com

Yes, I recommend this product

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Quality

 

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5 Stars

AC Unit

Ella27 3/26/2023

I bought my new AIR CONDITIONER February 2023. It Works So Efficiently and its So Quiet. Also has a Energy Saver..on it I am very pleased with my Purchase.
Originally posted on lg.com

Yes, I recommend this product

Features

 

Quality

 

Value

 
4 Stars

LG Air Heat Unit

Peanut200 3/12/2023

Purchased the unit as our old one quit working and hot season approaching.
Originally posted on lg.com

Yes, I recommend this product

Features

 

Quality

 

Value

 
5 Stars

FIXED HEAT/AIR

DALE FOGLE 1/22/2023

HI - HAD MY HEAT/AIR FEW MO. CALLS LG THEY FIXED IT IN 2WEEK SO VERY HAPPY AND THEY WERE NICE ABOUT IT THANKS LG-SO YOU REALLY ENJOY 1 IF YOU NEED IT.
Originally posted on lg.com

Yes, I recommend this product

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Quality

 

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1 Stars

Mary McDaniel 12/3/2022

Got my AC/heater in July and the heater doesnt not work been waiting since 11-19 for a service person to come fix it still to today no answer called and got no were at this point not a happy customer to day is 12/3
Originally posted on lg.com

No, I do not recommend this product

 Incentivized Review

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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

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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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Quality

 

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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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Quality

 

Value