LG LW1821ERSM Smart 18,000 BTU 230V Smart Wi-Fi Enabled Window Air Conditioner

The LG LW1821ERSM is a powerful 18,000 BTU window air conditioner designed to efficiently cool large spaces up to 1,000 square feet. This unit operates on 230V and features smart Wi-Fi capabilities, allowing you to control the temperature remotely via your smartphone or tablet. With its user-friendly app, you can adjust settings, set schedules, and monitor energy usage from anywhere. The air conditioner also includes a programmable timer, multiple cooling and fan speeds, and an energy saver mode to enhance efficiency. Its sleek design fits seamlessly into any window, while the easy-to-use remote control adds convenience. Enjoy a comfortable indoor environment with the LG LW1821ERSM, perfect for hot summer days.

• Quiet Operation
• Control Your Cool From Anywhere
• Maximum Cooling
• Maximum Usability
• Installation Made Easy
• Modern Design Made To Perfection

3-in-1 Operation

Use cool mode for powerful cooling and dehumidifying on hot days. In fan mode, the fan circulates the air in the room. Dry mode is ideal for damp, rainy days.

Easy Access to The Included Filter

This air conditioner features a slide-out, washable filter that's easy to access and remove without tools.

Control with Included Remote

Easily control your cool with the included remote.

Why should you buy LG LW1821ERSM ?

• High cooling capacity
  ~18,000 BTU, capable of cooling large rooms (≈ 1,000 sq ft)
  
  
• Smart / remote control
  includes Wi-Fi with LG ThinQ, works with voice assistants like Alexa & Google Assistant
  
  
• Multiple operating modes
  Cool, Fan, Dry modes for different weather / humidity conditions
  
  
• Flexible fan speeds
  Several fan and cooling speeds to adjust comfort vs power usage
  
  
• 4-way air direction (air deflection)
  helps distribute cool air evenly, reducing “hot spots”
  
  
• Energy saver function
  helps reduce electricity usage without sacrificing comfort
  
  
• Auto-restart after power loss
  restores previous settings automatically when power returns
  
  
• Convenient timer
  24-hour on/off timer lets you schedule operation
  
  
• Washable slide-out filter + filter alarm / reminder
  easier maintenance, better air quality
  
  
• Quiet enough on lower settings
  reasonable noise levels so it’s usable in living rooms / bedrooms

Frequently Asked Questions by Customers

• What is the cooling capacity and what room size can it handle
  It delivers 18,000 BTU, enough to cool an area of about 1,000 square feet.
  
  
• What kind of power supply does it need, and what are its electrical characteristics
  It runs on 208-230 volts / 60 Hz, draws about 7.5 amps (or 6.9 amps in some modes), and uses around 1,470-1,510 watts in cooling mode.
  
  
• How energy efficient is it, and what are its performance specs
  It has an EER of about 11.9, a CEER of about 11.8, dehumidifies about 4.9 pints per hour, and has dry air flow of about 530 cubic feet per minute.
  
  
• What are the noise levels in various operating modes
  On high it produces about 65 dB, mid around 63 dB, low about 61 dB.
  
  
• What are the physical dimensions and weight, and what window size is required
  It is approximately 25.98 inches wide, 28.11 inches deep, 17.68 inches high, and weighs about 130 pounds. It fits window openings of width 29-41 inches and minimum height about 19 inches.
  
  
• What control features and conveniences are included
  It supports WiFi control via LG ThinQ, voice control with Alexa and Google Assistant, remote control, a timer (24-hour on/off), auto-restart after power loss, energy saver function, filter alarm, 4-way air deflection, thermostat control, multiple fan speeds, a slide-out washable filter, a “turbo” fan mode; also offers 3 cooling and 3 fan speeds and includes dry/fan/cool modes.
  
  
• What warranty does it come with
  It has a one-year parts and labor warranty.

Pros

• Strong cooling power for large spaces (~1,000 sq ft). Good for big rooms, open layouts, or spaces with high heat load.
• Useful smart features: You can control it via an app (ThinQ), schedule operations, use timer, remote, etc. These are helpful for convenience.
• Good airflow & dehumidification: 530 CFM and ability to remove moisture helps in humid conditions.
• Durable design: Washable filter, filter check indicator, auto-restart are nice for long term usability.
• Multiple fan/cooling modes: Allows some flexibility in how strongly you cool, so you can moderate power usage.

Cons

• Voltage requirement: Needs 208/230V; not compatible with usual 110-120V outlets. That means either you need the right electrical supply or incur additional installation cost.
• Noise is significant on higher settings: 65 dB is loud; “low” is better but still audible. For very quiet rooms (bedrooms, libraries), this might be a drawback.
• Power consumption: At ~1,500 W in cooling mode, cost of running will be considerable if used continuously.
• Size & weight: It’s large, heavy, bulky; installation needs a strong window frame, possibly outside support, sealing etc.
• Efficiency isn’t top tier: EER/CEER are decent, but there are inverter or more efficient models that may use less electricity (especially in Indian climate).

Conclusion

The LG LW1821ERSM is a solid choice if you have a large room or space (~800-1,000 sq ft) that needs dependable cooling, with added convenience of smart control and features like timer, auto restart, etc. If your electrical infrastructure supports 230V, then this unit delivers good performance.