Our Full Review
The Window AC Reimagined
LG's dual inverter technology transforms the window AC experience. Traditional units cycle fully on and off, creating temperature swings and energy waste. The LW1217ERSM's inverter continuously adjusts compressor speed, maintaining your set temperature within 1°F while using significantly less electricity.
Our testing showed 40% lower energy consumption compared to a standard 12,000 BTU window unit under identical conditions. Over a cooling season, that translates to roughly $150-200 in savings—the efficiency premium pays for itself within 2-3 years.
Silence Is Golden
At 44dB, this is legitimately quiet. We measured 42dB in our acoustically-treated test room—comparable to a quiet library. You can hold normal conversations, watch TV at reasonable volumes, and sleep without that constant AC drone. For bedrooms, this alone is worth the premium.
Smart Features That Work
The LG ThinQ app reliably connects and provides useful features: scheduling, energy monitoring, and voice control via Alexa/Google. The app occasionally needs reconnection after power outages, but overall it's among the better smart AC implementations we've tested.
The Verdict
The LG LW1217ERSM represents the pinnacle of window AC technology. The combination of inverter efficiency, near-silent operation, and smart connectivity creates an experience that rivals central air—at a fraction of the cost.
Best For
Those seeking the best window AC regardless of budget, bedroom installations, home offices, smart home enthusiasts, energy-conscious buyers.
Avoid If
You're on a tight budget, need basic cooling only, or don't have a suitable window for the unit's size.