LG Art Cool Mirror 12,000 BTU
#15 in 12,000 BTUFull review
For mild to moderate winters: it heats only down to −4 °F and loses some of its heat in deep cold.
The LG Art Cool Mirror 12,000 BTU rates 3.8 among 12,000 BTU mini-splits; the LG Art Cool Mirror 18,000 BTU rates 3.5 among 18,000 BTU ones.
LG Art Cool Mirror 18,000 BTU
#15 in 18,000 BTUFull review
For mild to moderate winters: it heats only down to −4 °F and loses some of its heat in deep cold.
Prices were last checked October 21, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different size classes (12,000 BTU and 18,000 BTU), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | LG Art Cool Mirror 12,000 BTU | LG Art Cool Mirror 18,000 BTU |
|---|---|---|
| Overall rating | 3.8/5 | 3.5/5 |
| Cold weather 40% | 42 keeps 74% of its heat at 5 °F, heats down to -4 °F | 37 keeps 70% of its heat at 5 °F, heats down to -4 °F |
| Efficiency 30% | 69 10.5 HSPF2, 22.5 SEER2, COP 1.99 at 5 °F | 56 10 HSPF2, 23 SEER2, COP 1.80 at 5 °F |
| Warranty 20% | 100 10-year compressor, 10-year parts | 100 10-year compressor, 10-year parts |
| Noise 10% | 90 indoor unit from 21 dB(A) | 43 indoor unit from 31 dB(A) |
Specifications
| LG Art Cool Mirror 12,000 BTU | LG Art Cool Mirror 18,000 BTU | |
|---|---|---|
| Capacity (certified) | ||
| Size (nominal) | 12,000 BTU | 18,000 BTU |
| Cooling at 95 °F | 12,000 Btu/h | 18,000 Btu/h |
| Heating at 47 °F | 13,600 Btu/h | 21,600 Btu/h |
| Heating at 17 °F (max) | 12,400 Btu/h | 18,600 Btu/h |
| Heating at 5 °F (max) | 10,000 Btu/h | 15,200 Btu/h |
| Heat kept at 5 °F | 74% | 70% |
| Efficiency (certified) | ||
| HSPF2 (Region IV) | 10.5 | 10 |
| SEER2 | 22.5 | 23 |
| EER2 | 12.8 | 13 |
| COP at 5 °F | 1.99 | 1.80 |
| ENERGY STAR | ENERGY STAR Cold Climate | ENERGY STAR Cold Climate |
| AHRI certificate | 215413008 | 215413010 |
| Operating range | ||
| Heats down to | -4 °F | -4 °F |
| Cooling range | 14 to 118 °F | 14 to 118 °F |
| Installation | ||
| Installed by | Professional (sold through installers) | Professional (sold through installers) |
| Line set connection | Flare fittings (vacuum pump needed) | Flare fittings (vacuum pump needed) |
| Line set | up to 82 ft | up to 114.8 ft |
| Voltage | 230 V | 230 V |
| Refrigerant | R-32 | R-32 |
| Indoor unit | KNUAK121A | KNUAK181A |
| Outdoor unit | KUSAB121A | KUSAB181A |
| Build | ||
| Indoor noise | 21–41 dB(A) | 31–47 dB(A) |
| Outdoor noise | 47 dB(A) | 55 dB(A) |
| Wi-Fi | Built in | Built in |
| Weight | indoor 22.7 lb / outdoor 68.8 lb | indoor 27.8 lb / outdoor 127.9 lb |
| Warranty | 10 yr compressor, 10 yr parts | 10 yr compressor, 10 yr parts |
| Warranty with DIY install | No, a licensed installer is required | No, a licensed installer is required |