How loud is the LG 18,000 BTU Window Air Conditioner with Heat?

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

How many watts does the LG 18,000 BTU Window Air Conditioner with Heat use?

It draws 1,640 watts (7.8 amps at 208/230 V) while cooling at full power, per its retailer's specification for this exact model. At the US average electricity price that is about $0.30 an hour; once the room is cool the compressor cycles, so most hours cost less.

What size room does the LG 18,000 BTU Window Air Conditioner with 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 Window Air Conditioner with Heat?

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

Does the LG 18,000 BTU Window Air Conditioner with Heat heat as well as cool?

Yes. It heats with an electric coil, rated 12,000 BTU of heating output on 3,670 watts. At its rated heat it costs about $0.68 an hour at the US average electricity price.

Window unit Heats too

LG · Model LW1823HR

18,000 BTU Window Air Conditioner with Heat

Name: LG 18,000 BTU Window Air Conditioner with Heat
Brand: LG

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.

$759

Live price at Abt Electronics

Price checked Oct 27, 2026

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Will it cool your room?

Room size 861 sq ft ≈ 80 m²

Fits your 861 sq ft

This unit's cooling matches your 861 sq ft room.

Every window air conditioner side by side

At a glance

Best for renters and rooms where you cannot install a fixed unit.

Cooling

18,000 BTU

Size

Large

Noise

57 dB

Audible

Install: Self-fit, no pro neededPermission: Usually no permit

Where to buy

2 retailers

Abt ElectronicsLowest In stock$759Buy
Sylvane In stock$759Buy
AmazonPrice and stock shown on AmazonSearch Amazon

Prices & stock checked Oct 27, 2026.compare.ac may earn a commission on purchases, at no cost to you. It never changes the price you pay.As an Amazon Associate I earn from qualifying purchases.

Performance

Cooling capacity: 18,000 BTU · 5.3 kW
Power while cooling: 1,640 W (7.8 A at 208/230 V), about $0.30 an hour
Heating capacity: 12,000 BTU
Heat source: Electric coil
Power at rated heat: 3,670 W, about $0.68 an hour
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: LW1823HR
Indoor noise: 57 dB(A)about as loud as a dishwasher
Outdoor noise: Not published
Indoor unit: 25.5 x 16.83 x 30.5 in
Outdoor unit: None
Refrigerant: R-32
Wi-Fi / app: Not published
Outdoor unit needed: No
Power supply: 208/230 V, NEMA 6-20P plug
Warranty: 1-Year Limited Parts and Labor

Heating capacity, heating power, supply voltage, plug, cooling power, cooling current, refrigerant and warranty are from Sylvane's published specifications for this exact configuration, checked Oct 18, 2026.

Power while cooling: From the maximum cooling draw its retailer lists for this exact model. An hour's cost is at that draw and the US average electricity price of 18.44¢/kWh (U.S. Energy Information Administration, Electric Power Monthly Table 5.6.A (residential average, May 2026)). The compressor cycles once the room is cool, so most hours cost less.

Hourly heating cost: At the rated heating output and the US average electricity price of 18.44¢/kWh (U.S. Energy Information Administration, Electric Power Monthly Table 5.6.A (residential average, May 2026)). A thermostat cycles the heat, so most hours cost less. A heat pump's output and advantage shrink as it gets colder outside, and one with an electric back-up heater draws far more while that runs.

What is good

Heats as well as cools, which 31 of the 151 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

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

United StatesUS: historic district Certificate of AppropriatenessReviewed June 2026Permit required

United StatesUS: HOA / condo CC&Rs and architectural reviewReviewed June 2026Permit required

United StatesUS: NEC Article 440 dedicated circuit and disconnectReviewed June 2026Allowed with conditions

United StatesUS: window-unit restrictions and bracket/safety rulesReviewed June 2026Allowed with conditions

See all United States rules

Common questions about the LG 18,000 BTU Window Air Conditioner with Heat

How loud is the LG 18,000 BTU Window Air Conditioner with Heat?: 57 dB(A) indoors, about as loud as a dishwasher.
How many watts does the LG 18,000 BTU Window Air Conditioner with Heat use?: It draws 1,640 watts (7.8 amps at 208/230 V) while cooling at full power, per its retailer's specification for this exact model. At the US average electricity price that is about $0.30 an hour; once the room is cool the compressor cycles, so most hours cost less.
What size room does the LG 18,000 BTU Window Air Conditioner with 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 Window Air Conditioner with Heat?: No. It is a window unit you can fit yourself, no professional needed. Usually no permit.
Does the LG 18,000 BTU Window Air Conditioner with Heat heat as well as cool?: Yes. It heats with an electric coil, rated 12,000 BTU of heating output on 3,670 watts. At its rated heat it costs about $0.68 an hour at the US average electricity price.