How loud is the LG 18,000 BTU Wi-Fi Window Air Conditioner w/ Heat?

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

What size room does the LG 18,000 BTU Wi-Fi Window Air Conditioner w/ Heat cool?

It is rated to cool a room up to 1,000 sq ft (18,000 BTU · 5.3 kW).

Do I need a professional to install the LG 18,000 BTU Wi-Fi Window Air Conditioner w/ Heat?

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

Does the LG 18,000 BTU Wi-Fi Window Air Conditioner w/ Heat heat as well as cool?

Yes. It also heats, rated 12,000 BTU of heating output.

Window unit Heats too

LG · Model LW1823HRSM

18,000 BTU Wi-Fi Window Air Conditioner w/ Heat

A window air conditioner rated at 18,000 BTU for rooms up to 1,000 sq ft. It heats in winter too and self-installs in a window.

$819

Live price at Sylvane

Price checked Oct 1, 2026

Buy at Sylvane

Performance

Cooling capacity: 18,000 BTU · 5.3 kW
Heating capacity: 12,000 BTU
Room coverage: up to 1,000 sq ft
Energy Star: Not published
CEER: Not published
Annual energy (cooling): Not published

Noise, size & features

Model number: LW1823HRSM
Indoor noise: 57 dB(A)about as loud as a dishwasher
Outdoor noise: Not published

Warranty, heating capacity and refrigerant are from Sylvane's published specifications for this exact configuration, checked Sep 26, 2026.

What is good

Heats as well as cools, which 31 of the 152 window units we list offer.
Uses R-32 (GWP 675), the low-GWP class new US residential equipment moved to.

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.

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

R-32

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

Common questions about the LG 18,000 BTU Wi-Fi Window Air Conditioner w/ Heat

How loud is the LG 18,000 BTU Wi-Fi Window Air Conditioner w/ Heat?: 57 dB(A) indoors, about as loud as a dishwasher.
What size room does the LG 18,000 BTU Wi-Fi Window Air Conditioner w/ Heat cool?: It is rated to cool a room up to 1,000 sq ft (18,000 BTU · 5.3 kW).
Do I need a professional to install the LG 18,000 BTU Wi-Fi Window Air Conditioner w/ Heat?: No. It is a window unit you can fit yourself, no professional needed. Usually no permit.
Does the LG 18,000 BTU Wi-Fi Window Air Conditioner w/ Heat heat as well as cool?: Yes. It also heats, rated 12,000 BTU of heating output.