To properly experience our LG.com website, you will need to use an alternate browser or upgrade to a newer version of internet Explorer (IE9 or greater).

The LG.com website utilizes responsive design to provide convenient experience that conforms to your devices screen size. In order to get the best possible experience our LG.COM website please follow below instructions.

If you’re using Internet Explorer 8 or earlier, you will need to use an alternate browser such as Firefox or Chrome or upgrade to a newer version of internet Explorer (IE9 or greater).

If you’re using Internet Explorer 9 and higher, turn off your Internet Explorer browser’s “Compatibility View settings” by following steps below:

  • Right click at the top of your browser and make sure the “Menu Bar” option is selected
  • Select “Tools” from the menu bar and then select “Compatibility View settings”
  • In the pop-up menu uncheck all three boxes and click “Close”
  • Your browser window will automatically refresh and you’ll be ready to go
Skip to Contents Skip to Accessibility Help
LG Air Conditioners LT121CNR 1

LT121CNR

11,500 BTU Thru-the-Wall Air Conditioner with remote

Discontinued

Key Features

  • Universal Fit for Sleeve
  • Gold Fin Anti-Corrosion
  • 3 cooling and fan speeds with Auto Cool
  • 4-way air direction
Where to Buy Where to Buy
Print Specs Energy Guide Download Energy Guide Download Spec Sheet
See all Specs
PERFORMANCE
DIMENSIONS
FEATURES
ELECTRICAL RATINGS
WARRANTY

What People Are Saying

Rated 1 out of 5 by from DO NOT BUY THIS UNIT I've had this AC for nearly 2 months, and it performs worse than the 40 year old AC removed. The old one worked - not good - but it worked. This one recycles over, and over and over all day long, and it never reaches the temperature that I've got it set at. I've got an "atomic clock" with temperature control, only 8 feet directly in front of it. I'm so disappointed in this unit. If it were possible, I'd have my contractor take it out, and I'd return it to the store. DO NOT BUY THIS UNIT
Date published: 2014-07-08
Rated 4 out of 5 by from Better than expected, but a bit difficult to insta This unit very well cools an area larger than specified. It may be a Home Depot issue, but I'm not sure I bought the proper wall sleeve and it was a bit difficult to install.
Date published: 2012-12-04
Rated 4 out of 5 by from powerful fan blower Although this AC is only rated at 11500 BTU it has a very strong fan that makes all the difference in a room. I have a small ranch home that has a large 410 SF room facing West that takes a beating from the hot summer sun in the afternoon. This AC fan blows cold air clear across the large room and makes staying inside bearable on a hot day.
Date published: 2012-06-20
  • y_2018, m_12, d_11, h_2
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.9
  • cp_1, bvpage1
  • co_hasreviews, tv_1, tr_3
  • loc_en_US, sid_MD00000473, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_lg
  • bvseo_sdk, java_sdk, bvseo-2.3.0.0
  • CLOUD, getReviews, 4ms
  • REVIEWS, PRODUCT

ASK & ANSWER

Ask your questions. Share your answers.
Please first review the detailed product information and help guides in the Product Support section for this product prior to posting a question.

Fan speed not setting?

Anytime i turn on the AC it starts at fan speed 2 and can only be switched to 3 no matter how i set the fan speed to 1 it always reverts back to 2 regardless is their anything i can to turn it down to fan 1 i dont need it always at 2/3?
Asked by: Meech
It is the design of the FAN SPEED control to always advance the speed of the fan in the following progression: HIGH -> LOW -> MED -> HIGH. As such, if the fan is running in the HIGH speed, pressing the FAN SPEED button on the remote control should drop the fan to its LOWEST speed. If this is not the case, then the unit may require service. To make service arrangements, you may either contact our Customer Interactive Center at 800-243-0000, or you can check our Repair Provider Lookup on our website, at http://www.lg.com/us/support/repair/support-repair-provider-lookup.jsp.
Answered by: NeilE
Date published: 2013-10-22

outside cover?

We recently had an LT121CNR installed and there is no cover on the outside of the unit, which is exposed to the elements. Should there be a metal cover or shield on the fins and other components?
Asked by: Michael
Yes, you need a through the wall sleeve, but good like finding it. I couldn't find which one was the proper one either on LG's or Home Depot's websites.
Answered by: Rick69
Date published: 2013-10-22

Wall electrical outlet for LG LT121CNR AC?

What type of wall power outlet is required? Standard 15 amp? 20 amp?
Asked by: bobm85301
It only draws 10 amps, so a 15 amp wall socket is most acceptable.
Answered by: Rick69
Date published: 2013-10-22

Is a through the wall sleeve necessary?

Can the unit be removed from the outer casing, the casing be mounted and then re-install the unit in the casing?
Asked by: Spinax
Yes, you would need a sleeve for it. LG's universal Thru the Wall sleeve will fit the standard size for wall openings.
Answered by: Nadine
Date published: 2013-10-22

where is condensation plug on bottom of lt 121cnr

Asked by: Anonymous
This unit has not been designed with a “condensation plug”. It is designed so that the majority of the condensation is thrown onto the condenser coils, using what we call a “Slinger Fan”, in a manner which increases the efficiency of the operation of the unit. If too much moisture is drawn, the water will naturally spill out of the back of the unit.
Answered by: Neil
Date published: 2013-10-22

what is quietest LG thru-wall unit in 10,000 BTU range and what are the decibels?

Asked by: Andrew
Thank you for your question. You should find all of the measurements and specifications for your unit at http://www.lg.com/us/support/index.jsp. If the information is not there, please feel free to contact one of product specialists at 1-800-243-0000 or via live chat @ www.LG.com.
Answered by: Stan
Date published: 2013-10-22

wall sleave

what is the wall sleave that works with your model LT121CNR air conditioner
Asked by: mikeydoin
  • y_2018, m_12, d_11, h_2CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.9
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_7
  • loc_en_US, sid_MD00000473, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_lg
  • bvseo_sdk, java_sdk, bvseo-2.3.0.0
  • CLOUD, getContent, 4ms
  • QUESTIONS, PRODUCT

RECENTLY VIEWED

LG air conditioners give you the power to cool one room, or several, with just the touch of a button. Designed for the way you live, they're available in a wide range of styles -- so you can create a space that's cool, comfortable and stylish, such as:


Portable: Take cool breezes with you from room to room, house to house, or from home to work. Boasting sleek, streamlined designs, powerful air throw, and incredibly quiet operations, our portable air conditioners offer the ultimate in flexibility.


Window: With an air conditioner that was created to fit perfectly inside your window frame, you can cool your space without disrupting your design. And with some models giving you the power to heat and cool your space, they can help you create a comfortable home all year long.


Casement: Created specifically for casement windows, this innovative range allows you to efficiently cool your home while maintaining its original look and feel.


Wall: LG wall units offer a more permanent solution to your cooling needs. Boasting powerful performance and innovative features, like multiple cooling and fan speeds, as well as a universal fit sleeve for a custom look, they offer a lasting solution to your cooling needs.


Cool your space with an LG air conditioner. Designed for efficiency, power and style, our innovative range of air conditioners allows you to enjoy cool breezes while maintaining the look and feel of your home. Explore our innovative collection and keep your family comfortable even during the hottest -- and most humid -- months of the year.

Design, features and specifications subject to change without notice. Screen images simulated and/or dramatized. Some features in videos may not be available on all models. Please refer to the TECHNICAL SPECIFICATIONS tab for a complete list of features by model.