How energy-efficient is the LG 18,000 BTU Dual Inverter Smart Wi-Fi Window Air Conditioner?

Its efficiency rating is CEER 14.7, and it is ENERGY STAR certified.

Do I need a professional to install the LG 18,000 BTU Dual Inverter Smart Wi-Fi Window Air Conditioner?

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

Window unitENERGY STAR

18,000 BTU Dual Inverter Smart Wi-Fi Window Air Conditioner

Name: LG 18,000 BTU Dual Inverter Smart Wi-Fi Window Air Conditioner
Brand: LG

A window air conditioner rated at 18,000 BTU for rooms up to 1,000 sq ft. It self-installs in a window and connects to Wi-Fi for app control.

$598

Live price at Abt Electronics

Price checked Sep 24, 2026

Buy at Abt Electronics In stock

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Price history at Abt Electronics

Lowest since Jul 25, 2026:$598on Aug 8, 2026

Currently the lowest price we have tracked at Abt Electronics since Jul 25, 2026down from $649 on Aug 7, 2026

Based on 48 prices we have recorded since Jul 25, 2026, not a market average.

Will it cool your room?

Room size 350 sq ft ≈ 32.5 m²

More than you need for 32.5 m²

This has more cooling than your 350 sq ft room needs. It can short-cycle and leave the air cool but humid.

Running costest.

~$170/year

Estimated from ENERGY STAR's published annual energy use at about 750 hours of cooling a year (the DOE test standard) 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 standardized figure for comparison; your real cost depends on how much you run it, your local rate and your climate.

Local rates vary widely (about 15¢/kWh in Florida to 33¢ in California), and hotter regions run their AC more hours, so your real cost differs.

At a glance

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

Cooling

5.3 kW

Size

Large

Noise

44 dB

Audible

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

Where to buy

2 retailers

Abt ElectronicsLowest In stock$598Buy
Sylvane In stock$799Buy

Prices & stock checked Sep 24, 2026.compare.ac may earn a commission on purchases, at no cost to you. It never changes the price you pay.

Performance

Cooling capacity: 18,000 BTU · 5.3 kW
Heating capacity: Cooling only
Room coverage: up to 1,000 sq ft
Energy Star: Yes
CEER: 14.7
Annual energy (cooling): 918 kWh

Noise, size & features

Indoor noise: 44 dB(A)about as loud as a quiet library
Outdoor noise: Not published
Indoor unit: 26 x 17.72 x 26.22 in
Outdoor unit: None
Refrigerant: R-32
Wi-Fi / app: Yes
Outdoor unit needed: No

What is good

At 44 dB(A) it is quieter than 101 of the 119 other window units we list that publish a noise figure.
At $598 it undercuts 13 of the 16 other 15,000-18,000 BTU window units we list with a live price.
Wi-Fi and app control, which 43 of the 219 window units we list offer.

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

R-32

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

GeneralCondo / HOA: exterior changes need approvalReviewed June 2026Permit required

GeneralHistoric / listed buildings: consent before any exterior unitReviewed June 2026Permit required

MassachusettsMassachusetts: local historic district approval (MGL c.40C)Reviewed June 2026Permit required

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

See full rules by region

Common questions about the LG 18,000 BTU Dual Inverter Smart Wi-Fi Window Air Conditioner

How much does the LG 18,000 BTU Dual Inverter Smart Wi-Fi Window Air Conditioner cost to run per year?: About $170 a year. Estimated from ENERGY STAR's published annual energy use at about 750 hours of cooling a year (the DOE test standard) 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 standardized figure for comparison; your real cost depends on how much you run it, your local rate and your climate.
How loud is the LG 18,000 BTU Dual Inverter Smart Wi-Fi Window Air Conditioner?: 44 dB(A) indoors, about as loud as a quiet library.
How energy-efficient is the LG 18,000 BTU Dual Inverter Smart Wi-Fi Window Air Conditioner?: Its efficiency rating is CEER 14.7, and it is ENERGY STAR certified.
What size room does the LG 18,000 BTU Dual Inverter Smart Wi-Fi Window Air Conditioner 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 Dual Inverter Smart Wi-Fi Window Air Conditioner?: No. It is a window unit you can fit yourself, no professional needed. Usually no permit.