LG Dual Inverter 12,000 BTU
#6 in WindowFull review
A strong choice for a big living room or open-plan space. It’s efficient and quiet for its size if you can handle the 85 lb install.
Amazon $559$559
The LG Dual Inverter 12,000 BTU is the better air conditioner overall, rated 3.8 to 3.5. The LG Dual Inverter 12,000 BTU leads on quiet and inverter & app. The Keystone 10,000 BTU Inverter Window AC costs $129.01 less ($429.99 vs $559).
Keystone 10,000 BTU Inverter Window AC
#13 in WindowFull review
An efficient, compact inverter unit for a living room or large bedroom up to 450 sq ft. Good if you want quiet and low running costs without paying for smart features.
Amazon $429.99$429.99
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the LG Dual Inverter 12,000 BTU for quiet (44 dB on low (maker rating) vs 52 dB on low (maker rating)) and inverter & app (inverter compressor, Wi-Fi app vs inverter compressor, no app).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every window air conditioner; a clear win is highlighted. How we rank explains each one.
| Factor weight | LG Dual Inverter 12,000 BTU | Keystone 10,000 BTU Inverter Window AC |
|---|---|---|
| Overall rating | 3.8/5 | 3.5/5 |
| Value 30% | 61 $46.58 per 1,000 BTU (certified) | 67 $43 per 1,000 BTU (certified) |
| Efficiency 30% | 73 CEER 15 | 73 CEER 15 |
| Quiet 15% | 78 44 dB on low (maker rating) | 33 52 dB on low (maker rating) |
| Inverter & app 15% | 100 inverter compressor, Wi-Fi app | 60 inverter compressor, no app |
| Warranty 10% | 0 1-year warranty | 0 1-year warranty |
Specifications
| LG Dual Inverter 12,000 BTU | Keystone 10,000 BTU Inverter Window AC | |
|---|---|---|
| Cooling | ||
| Type | Window | Window |
| Certified capacity | 12,000 BTU | 10,000 BTU |
| Room size (maker) | 550 sq ft | 450 sq ft |
| Inverter compressor | Yes | Yes |
| Heat | No | No |
| Dehumidifying | 86.4 pints/day | 36 pints/day |
| Noise | 44 to 58 dB | 52 to 57 dB |
| Efficiency and power | ||
| CEER | 15 Btu/Wh | 15 Btu/Wh |
| Certified by | ENERGY STAR | ENERGY STAR |
| ENERGY STAR | Yes | Yes |
| Power | 1,020 W | 920 W |
| Voltage | 115 V | 115 V |
| Current | 9.1 A | 8.2 A |
| Refrigerant | R-32 | R-32 |
| Controls and fit | ||
| Wi-Fi app | Yes | No |
| Voice assistants | Alexa, Google Assistant | - |
| Remote | Yes | Yes |
| Window width | 27 to 39 in wide | - |
| Dimensions | 14.9 x 23.6 x 28.8 in | 13.58 x 18.98 x 18.54 in |
| Weight | 85 lb | 45.6 lb |
| Warranty | 1 years | 1 years |