LG LW1822IVSM
window air conditioner · 18,000 BTU cooling · fits ~1,000 sq ft
Buy the Keystone KSTAW182WA on Amazon — $656.99 →This exact model isn't for sale on Amazon today. Same size: our pick to buy instead. Affiliate link.
A window AC rated 18,000 BTU — enough cooling for a room of up to about 1,000 square feet (ENERGY STAR's room AC sizing chart).
Buy this instead
$656.99 at Amazon
The Keystone KSTAW182WA: 18,000 BTU, CEER 15, inverter, ENERGY STAR. We found no Amazon listing for the LG LW1822IVSM that can be bought today. This is the same size, and the most efficient match we could tie to its exact Amazon listing. The listing names this model number; we checked it was in stock, sold by Amazon.com, on 2026-10-17.
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The Verified Label — every certified spec
certified 2023-09-18
status: Active
Cooling & efficiency — source: ENERGY STAR / DOE
Fit & install — does it fit your window?
Efficiency & running cost — computed by Verified HVAC Data
Worth keeping in proportion: every unit in the 18,000 BTU class runs within $18 a year of every other. The gap between the cheapest and dearest to buy at this size is 11× larger. Efficiency is the smallest number on this page, which is why it is not at the top of it.
Refrigerant & identity
Brand, warranty & reliability
LG ductless/VRF is a premium-tier Korean line with strong efficiency and a broad service base, but full 10-12 year coverage hinges on registration and installation by an LG Pro/Excellence contractor, and older (2018-and-earlier) inverter boards had elevated failure rates LG has since addressed.
Reliability is our read of published brand assessments (source), not a certified rating — real-world dependability hinges on a correct install more than the brand. Warranty terms are the manufacturer's (policy) and almost always require online registration within 60–90 days for the full length.
Compare similar room ACs
Frequently asked questions
Is 18,000 BTU right for my room, or should I size up?
About 1,000 square feet is the guide figure, and 17 certified units sit on that shelf. The next shelf up is 24,000 BTU (22 units), about 1,500 sq ft. Below it, 15,000 BTU (7 units) covers about 700 sq ft. Between two shelves, take the smaller one: oversizing is the usual reason a unit cools but leaves the room clammy, which our sizing calculator explains.
Does the LG LW1822IVSM need a special outlet?
Yes. It runs on 230 volts, not the 115-volt outlet a bedroom or living room normally has, so it needs a dedicated circuit installed by an electrician. Budget for that before you buy: most units in its 18,000 BTU class are 115-volt, so a same-size alternative may avoid the wiring entirely.
Will the LG LW1822IVSM fit my window?
The certification record doesn't publish reliable full dimensions for this unit, so measure your opening and compare against the seller's listing before you buy.
Sources. Certification and CEER from ENERGY STAR room-AC data and the DOE compliance certification database. Cooling capacity, dimensions and refrigerant are the manufacturer-certified values. Annual running cost, suggested room size and the percentile are computed by Verified HVAC Data from published ratings and EIA U.S. average electricity prices — see our methodology. Refrigerant GWP is the IPCC value. We publish no star ratings and take no payment for placement. "Not published" means the source registry doesn't disclose it — we never fill a spec with a guess.