The Keystone 10,000 BTU Inverter Window AC is the better air conditioner overall, rated 3.5 to 2.7. The Keystone 10,000 BTU Inverter Window AC leads on efficiency and inverter & app. The LG 10,000 BTU Window AC wins on value. The LG 10,000 BTU Window AC costs $70.99 less ($359 vs $429.99).
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 $429.99A plain 10,000 BTU unit for a living room where noise and smart features don’t matter. Inverter models cost a bit more and run quieter and cheaper.
Amazon $359Prices 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.
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 | Keystone 10,000 BTU Inverter Window AC | LG 10,000 BTU Window AC |
|---|---|---|
| Overall rating | 3.5/5 | 2.7/5 |
| Value 30% | 67 $43 per 1,000 BTU (certified) | 80 $35.90 per 1,000 BTU (certified) |
| Efficiency 30% | 73 CEER 15 | 18 CEER 12 |
| Quiet 15% | 33 52 dB on low (maker rating) | 28 53 dB on low (maker rating) |
| Inverter & app 15% | 60 inverter compressor, no app | 0 fixed-speed compressor, no app |
| Warranty 10% | 0 1-year warranty | 0 1-year warranty |
| Keystone 10,000 BTU Inverter Window AC | LG 10,000 BTU Window AC | |
|---|---|---|
| Cooling | ||
| Type | Window | Window |
| Certified capacity | 10,000 BTU | 10,000 BTU |
| Room size (maker) | 450 sq ft | 450 sq ft |
| Inverter compressor | Yes | No |
| Heat | No | No |
| Dehumidifying | 36 pints/day | 64.8 pints/day |
| Noise | 52 to 57 dB | 53 to 55 dB |
| Efficiency and power | ||
| CEER | 15 Btu/Wh | 12 Btu/Wh |
| Certified by | ENERGY STAR | - |
| ENERGY STAR | Yes | No |
| Power | 920 W | 820 W |
| Voltage | 115 V | 115 V |
| Current | 8.2 A | 7.7 A |
| Refrigerant | R-32 | - |
| Controls and fit | ||
| Wi-Fi app | No | No |
| Remote | Yes | Yes |
| Window width | - | 23 to 36 in wide |
| Dimensions | 13.58 x 18.98 x 18.54 in | 12.4 x 19.6 x 19.4 in |
| Weight | 45.6 lb | 57 lb |
| Warranty | 1 years | 1 years |
| Sealed system warranty | - | 1 years |
