How loud is the LG 12,000 BTU Window Air Conditioner?

53 dB(A) indoors, about as loud as a dishwasher.

What size room does the LG 12,000 BTU Window Air Conditioner cool?

It is rated to cool a room up to 550 sq ft (12,000 BTU · 3.5 kW).

Do I need a professional to install the LG 12,000 BTU Window Air Conditioner?

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

Window unit

12,000 BTU Window Air Conditioner

A window air conditioner rated at 12,000 BTU for rooms up to 550 sq ft. It self-installs in a window.

$399

Live price at Sylvane

Price checked Sep 24, 2026

Buy at Sylvane In stock

Performance

Cooling capacity: 12,000 BTU · 3.5 kW
Heating capacity: Cooling only
Room coverage: up to 550 sq ft
Energy Star: Not published
CEER: Not published
Annual energy (cooling): Not published

Noise, size & features

Indoor noise: 53 dB(A)about as loud as a dishwasher
Outdoor noise: Not published
Indoor unit: 23.625 x 15 x 22.2 in

What is good

At $399 it undercuts 48 of the 53 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

Plug and play

Refrigerant

United StatesUS: local mechanical and electrical permits (vary by city)Reviewed June 2026Permit required

Common questions about the LG 12,000 BTU Window Air Conditioner

How loud is the LG 12,000 BTU Window Air Conditioner?: 53 dB(A) indoors, about as loud as a dishwasher.
What size room does the LG 12,000 BTU Window Air Conditioner cool?: It is rated to cool a room up to 550 sq ft (12,000 BTU · 3.5 kW).
Do I need a professional to install the LG 12,000 BTU Window Air Conditioner?: No. It is a window unit you can fit yourself, no professional needed. Usually no permit.

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