Search  for anything...
LG

LG 18,000 BTU Heat and Cool Window Air Conditioner with WiFi Controls, Smart Temperature Control for Rooms up to 1,000 Sq. Ft., White

  • Based on 1,322 reviews
Condition: New
Checking for the best price...
$752.19 Why this price?
New Year Deal · 5% off was $791.69

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

30-day refund / replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Saturday, Jan 10
Order within 19 hours and 25 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Color: White


Size: 18000 BTU


Style: Wifi 230V


Features

  • Supplemental Heat for Year-Round Comfort: Add warmth on cooler days with the supplemental heat option, making this unit perfect for both heating and cooling throughout the year
  • Customizable Cooling & Heating: With 2 cooling, heating, and fan speeds, plus a 24-hour timer, you can personalize your comfort with ease and create the perfect schedule for your space with LG's Heat and Cool Window Air Conditioner
  • Auto Restart After Power Outages: The auto restart feature automatically turns your air conditioner back on after a power failure, ensuring your space stays comfortable without interruption
  • Ideal for Medium to Large Rooms (Up to 1,000 Sq. Ft.): This 18,000 BTU unit is perfect for cooling and heating rooms up to 1,000 sq. ft., providing efficient temperature control for medium-sized spaces

Description

The LG 18,000 BTU Heat and Cool Window Air Conditioner is the SMART way to keep your house feeling comfortable no matter what the weather is like outside! LG ThinQ technology lets you control your air conditioner with your phone or use with Amazon Alexa and Hey Google to have control with the sound of your voice. This unit is ideal for cooling medium to large rooms up to 1000 sq. ft. and you can even add a bit of warmth on cooler days with the supplemental heat option. With 2 cooling and fan speeds and a 24-hour timer, you can create the perfect cooling schedule. 4-way air deflection lets the flow of air be directed where it's needed most, whether cooling, heating, dehumidifying, or just circulating air. If there is a power outage, the auto restart feature will automatically turn your unit back on when power is restored. Other features include a remote control, easy window installation kit, removable, washable filter, and a check filter alert. For added convenience, the unit operates quietly, ensuring a peaceful environment without disruption. Plus, the energy-efficient design helps reduce electricity costs while keeping your space comfortable all year round. The sleek, modern design seamlessly blends into any room, adding both functionality and style.

Specs & Other Info

SpecificationDetails
ManufacturerLG Electronics
ModelLW1821HRSM
TypeWindow Air Conditioner
Capacity5.5 Pints
Cooling and Heating Power18000 BTUs
FunctionsCooling, Heating, Dehumidifying
Special FeaturesRemote Control, WiFi Connectivity, Filter Reminder, Dual Functionality
Dimensions30.5"D x 25.5"W x 16.84"H
Energy EfficiencySEER 11.1, Not Energy Star Rated
ColorWhite
Voltage230 Volts
Noise Level57 dB
Weight126.5 pounds
OriginThailand
Surface CoverageUp to 1000 Sq Ft
FinishMatte
Warranty1-Year Limited
Accessories IncludedInstallation Kit, Remote Control

Frequently asked questions

To connect your LG air conditioner to Wi-Fi, first ensure your Wi-Fi is active and you have the LG ThinQ app downloaded on your smartphone. Power on your air conditioner, then open the app, select 'Add device', and follow the on-screen instructions to connect. Make sure your smartphone is connected to the Wi-Fi network you intend to use for the air conditioner.

Yes, this LG air conditioner is designed with both heating and cooling functions. It can efficiently cool a room during hot weather and provide heat during colder seasons, making it versatile for year-round use.

The LG 18,000 BTU air conditioner is designed with energy efficiency in mind, featuring an Energy Efficiency Ratio (EER) that complies with environmental and energy-saving standards. While specific EER may vary by model, it generally offers cost-effective operation and might be eligible for energy rebates in some areas.

You can control your LG air conditioner using the physical control panel on the unit, the included remote control, or via Wi-Fi using the LG ThinQ app. With the app, you can adjust temperature settings, modes, and schedules from anywhere, as long as you have an internet connection.

Similar Products

Top Amazon Reviews

🚀 Abunda's Overview

This is our summary and key points to consider based on customer reviews.

The reviewed air conditioning and heating unit receives high praise for its efficiency, easy installation, and performance in both heating and cooling spaces, making it a versatile solution for various seasons and needs. Customers have successfully used it in different settings, including homes without traditional heating or insulation, garages, and rooms not served by central heating and air. It efficiently heats and cools spaces while being energy-conscious, leveraging solar energy or generators for some users.

Pros

  • đź’ˇ No assembly required and easy to install
  • 🌡️ Efficiently heats and cools, suitable for spaces up to 400 sq ft
  • ⚡ Low energy consumption, compatible with solar power and generators
  • 🔊 Quieter operation than expected, with a SM bonus for quietness
  • đź’° Under $500, making it an economically sound choice

Cons

  • 🌙 Heating performance might not meet expectations for all users
  • 🔧 Potential issues with warranty or replacement for business use
  • đź“Ź Certain models may require larger window sizes for installation

Should I Buy It?

If you're seeking a versatile, energy-efficient solution for both heating and cooling that's easy to install and operate, this product is an excellent choice. With its overall positive reviews, capability to work in different settings, and environmental considerations, it appears to be a worthy investment for those looking to enhance their comfort affordably. However, if you require robust heating in extremely cold conditions, you may want to assess its performance further or explore additional heating supplements.

    • Heating AND cooling in the same unit - wonderful
Color: Bright White Size: 7500 BTU Style: Wifi 115V
I got this to replace the Vornado space / small room heater. This unit has not only a heater built-in but also air conditioning! It makes a wonderful addition to the mancave shed. It is very energy efficient, and it didn't significantly increase our electric bill. It fit in a semi-narrow single-pane glass window. We had to get a special mount for it so that it could be bolted into the windowsill, but regardless, we love it. We have it on auto all the time, and we've been satisfied. It does the job. ... show more
Reviewed in the United States on September 24, 2025 by ALONG
    • A MUST for crazy temperature rooms
Color: White Size: 7600 BTU Style: Wifi 115V
My son’s room is either burning up in the summer or freezing in the winter so having the ability to do heat and air is game changer!! Even in the fall it’s nice to have the app where I can program it to be air the first half the night then turn to heat the last half of the night when his room drops. It’s been a solid game changer. ... show more
Reviewed in the United States on October 5, 2025 by Kristina
    • Don’t buy LG
Color: Bright White Size: 18000 BTU Style: Wifi 230V
AC worked for 2 months in 2024. Turned on in June 2025; no cool air, no error code. Called LG and told unit under warranty; would send repairman in 2 - 3 weeks. Nothing. Called many more times and finally told no repairman in my area & could I find one. I already had called every repairman within 60 mile radius. I called many more times. Now offered a replacement after complaining to escalation team. I had to complete form on portal link asking for same info provided earlier. I provided receipt, sticker on AC unit, picture of unit etc. Told to be contacted by transportation team in about a week. Called many more times: told to wait 2 -3 weeks. Nothing. Called again, filed complaint with LG. Finally spoke to Alexis on Presidential team. She said AG out of stock and offered reimbursement. I completed form on portal link again agreeing to direct deposit reimbursement. I was told would receive secure link in 2-3 days. Nothing. Three weeks later received text saying to complete form on portal link again as I had done before; no explanation why or indication of error on my part. Called LG and not allowed to talk to Alexis on Presidential Team. Told I’d received text in 2 days with explanation and resolution of problem. Two days later I got a survey to rate how well problem was solved. Problem was not solved. I called LG, said all they could do was send escalation e-mail to escalation team. I called again and told the same thing. Three months later and many phone calls = no repair, no replacement, no refund, no explanation!! ... show more
Reviewed in the United States on September 12, 2025 by P. Ann Blackburn
    • After 3 decades this stopped my propane for heating!
Color: White Size: 1 Count (Pack of 1) Style: Electronic 115V
The media could not be loaded. No assembly required btw This is a A+++ ccu unit I call it . Climate control unit. Because In a few minutes you can easily go from heating to air conditioning back to heating in moments again . Isn’t new technology as a kid I lived with a heat pump but that was thousands included in house payments . So this absolutely makes a home of recommendation 350 sq feet totally comfortable in moments. I’ve been looking for anything but propane to heat and going back to the grid isn’t in my plans ever so this fit the situation. Only using 1280 watts of continuous usage is outstanding! Not running heat side from Solar today and don’t foresee it but works fantastically with my 1600 watt generator. Saved propane most likely will cover extra fuel used for generation but no electric bills is my main goal . Not going un noticed btw Last visit from them three days ago rechecked the line They don’t understand the outstanding efficiency of this new found treasure , I dreamed about turning this sorta air conditioner around as a kid so seeing it happen I had to save the under 500$ and buy it and so glad I did wow . I have a situation going on here whereas my neighbors have been really polluting my air so with propane had to have ventilation and loss efficiency and never was a fan of the gas fumes . Again with this new ccu I don’t have to do it’s recycling air saved us from the ongoing air assault's. So win win win Another good discovery this air conditioning side uses 575 watts same as the unit I replaced but this is 50% higher cooling capacity yet uses same wattage so was delighted it runs off my Solar in perfect conditions while suns out between 11/4 most of the year in Florida off the grid btw! Why they are not happy lol But nothing but good things so far One noteworthy issue I learned with using a parallel system with Solar was that the wires must be a sizable distance between power sources because just the magnetic sine waves can Interrupt the generator and cause a glitch which a kilowatt meter picked up with flashing screen indicating a issue with power source so keep in mind to use conduit and properly space opposing power supplies . So to review ac side uses 575 watts Easy to run off the sun in perfect conditions 1280 heat pump side that I don’t see Solar powering overnight unless you’ve built a massive battery bank see a electrician or get a backup generator as I wrote about in my book Solar Independent Utility Systems Manual So conclusion far better than burning anything for heat only thing that would beat this is a properly sized radiant heating system that uses the suns heat alongside its photovoltaic advantages. My next goal with geothermal alongside to replace this but until that dream happens This is my answer for the foreseeable future Can’t say enough about this outstanding ccu No more propane tanks running out No more feeding wood fires Now just time the generator usually five to eight hours depending on your temp setting. Set it to max 86 Max cool 61 makes working much harder far safer Thank you LG You hit this one out of the park Pure awesomeness Quietness a BONUS !!!! ... show more
Reviewed in the United States on November 6, 2023 by Kyle William Loshure
    • Working good
Color: Bright White Size: 23000 BTU Style: Electronic 230V
Working good so far
Reviewed in the United States on October 1, 2025 by Amazon Customer
    • A/C & Heat
Color: Bright White Size: 23000 BTU Style: Electronic 230V
Works great. Summer and winter. Easy on electric bill. Not to loud. Easy access filter for cleaning.
Reviewed in the United States on October 6, 2025 by MWA
    • Worked less then 6 months
Color: Bright White Size: 23000 BTU Style: Electronic 230V
Worked less then 6 months and stopped cooling in the heat of summer and can't find no one to work on/ fix it
Reviewed in the United States on September 24, 2025 by BikerJim69
    • Best investment LOVE THIS
Color: White Size: 1 Count (Pack of 1) Style: Electronic 115V
Let me start by saying I'm in florida. It has to be something powerful to cool us down. This device is on a poorly insulated front porch. Wow wow wow. She cools to the cool setting. Cycles on and off. For the 10 days a year were cold She heats it up not just takes the chill out, but heats it up. (Were not blasting it to 90s but a goodb73 will do. It cycles on and off keeping the room comfy. Not to much 1 way or the other, or some craziness that needs a babysitter. No more noisy than any other ac. Tells you when you need to clean the filter, and it don't lie. I found and ordered this ac here on Amazon. I swear on all that's good prior to it's arrival, I seen the EXACT same machine for DOUBLE in a big box store I'm happy I kept my order The only 1 thing for people that's like me. I'm not a handy man. It is a bit heavy. My son built a deal to help hold some of its weight off the back All in all we couldn't be happier with it. I can't say on if it did anything to my power bill. We were leaving the door open previous trying to make the house ac cool and the house heat warm it. And the same time we put that in we also put in a mini fridge so I'm not sure our bill changed much. ... show more
Reviewed in the United States on March 20, 2025 by J.B.

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...