What size room does the LG 14,000 BTU Smart Wi-Fi Enabled Window Air Conditioner cool?

It is rated to cool a room up to 800 sq ft (14,000 BTU · 4.1 kW).

Do I need a professional to install the LG 14,000 BTU Smart Wi-Fi Enabled Window Air Conditioner?

No. It is a window unit you can fit yourself, no professional needed. Usually no permit.

Window unit

LG · Model LW1521ERSM1

14,000 BTU Smart Wi-Fi Enabled Window Air Conditioner

A window air conditioner rated at 14,000 BTU for rooms up to 800 sq ft. It self-installs in a window and connects to Wi-Fi for app control.

$689

Live price at Sylvane

Price checked Sep 30, 2026

Buy at Sylvane In stock

Performance

Cooling capacity: 14,000 BTU · 4.1 kW
Heating capacity: Cooling only
Room coverage: up to 800 sq ft
Energy Star: Not published
CEER: Not published
Annual energy (cooling): Not published

Noise, size & features

Model number: LW1521ERSM1
Indoor noise: 57 dB(A)about as loud as a dishwasher
Outdoor noise: Not published

What to watch

At 57 dB(A) it is louder than 68 of the 81 other window units we list that publish a noise figure.
At $689 it costs more than 31 of the 34 other 12,000-14,000 BTU window units we list with a live price.

Installation & the rules that apply

This is a window unit. No EPA Section 608 technician is needed: the refrigerant circuit is factory-sealed and never opened. A plug-in window unit needs no permit, so the friction is with your building rather than the government. Many HOAs restrict window units on appearance grounds, though an HOA regulating how you mount one stands on much firmer ground than one banning cooling outright. Landlords can set conditions, and the falling hazard is taken seriously: New York City, for instance, requires window units to be supported by brackets or mounting rails, and many building insurers and HOAs now require a bracket regardless of city.

Installation

Self-fit, no pro needed

Refrigerant

GeneralRenters: get written landlord consent firstReviewed June 2026Often blocks install

Common questions about the LG 14,000 BTU Smart Wi-Fi Enabled Window Air Conditioner

How loud is the LG 14,000 BTU Smart Wi-Fi Enabled Window Air Conditioner?: 57 dB(A) indoors, about as loud as a dishwasher.
What size room does the LG 14,000 BTU Smart Wi-Fi Enabled Window Air Conditioner cool?: It is rated to cool a room up to 800 sq ft (14,000 BTU · 4.1 kW).
Do I need a professional to install the LG 14,000 BTU Smart Wi-Fi Enabled Window Air Conditioner?: No. It is a window unit you can fit yourself, no professional needed. Usually no permit.