Our take in 30 seconds
Best for: cold and very cold climatesStrengths
- Keeps 110% of its heat at 5°F, so backup heat rarely runs
- Heating efficiency (HSPF2 10) beats 77% of models
- Variable-speed compressor: quieter, steadier temperatures and better humidity control
- Uses newer, lower-impact R-32 refrigerant
Good to know
- No notable drawbacks in the certified data.
Running-cost calculator
Pre-filled with EIA prices · edit any fieldUses the base certified SEER2 (15.2) and HSPF2 (10). Assumes the unit is correctly sized. How we calculate.
Heating capacity as it gets colder
A heat pump's output falls as outdoor temperature drops. This is the certified heat output of the LG KUSXB181A at the three ENERGY STAR test temperatures (cooling capacity is 18,000 BTU/h for reference).
Retention at 17°F: 65% · at 5°F: 110%. Learn how to use these numbers in our cold-climate guide.
Estimated running cost in every state
Same unit, very different bills: from about $485 a year in Louisiana to $1,822 in Maine, driven by local electricity prices and how much heating or cooling the climate needs. Click a column to sort.
| State | Price | Heating | Cooling | Total / yr |
|---|---|---|---|---|
| Louisiana | 12.87¢ | $180 | $305 | $485 |
| Washington | 14.63¢ | $497 | $61 | $558 |
| Florida | 14.99¢ | $135 | $426 | $561 |
| Mississippi | 14.43¢ | $260 | $308 | $567 |
| Nevada | 12.72¢ | $305 | $271 | $576 |
| Tennessee | 13.42¢ | $376 | $207 | $582 |
| Oregon | 15.92¢ | $509 | $85 | $594 |
| Arizona | 15.05¢ | $211 | $392 | $603 |
| North Carolina | 14.95¢ | $389 | $230 | $619 |
| Kentucky | 13.80¢ | $442 | $180 | $621 |
| Arkansas | 14.37¢ | $374 | $255 | $629 |
| South Carolina | 15.76¢ | $347 | $299 | $645 |
| Utah | 13.31¢ | $506 | $142 | $648 |
| Georgia | 15.90¢ | $350 | $301 | $651 |
| Texas | 15.91¢ | $286 | $377 | $663 |
| Alabama | 16.33¢ | $359 | $309 | $669 |
| Idaho | 13.37¢ | $562 | $111 | $672 |
| Oklahoma | 14.82¢ | $415 | $263 | $678 |
| New Mexico | 16.51¢ | $495 | $196 | $691 |
| Nebraska | 13.54¢ | $569 | $144 | $713 |
| West Virginia | 16.31¢ | $587 | $155 | $742 |
| Missouri | 16.02¢ | $545 | $209 | $753 |
| Kansas | 15.47¢ | $557 | $202 | $758 |
| Virginia | 17.64¢ | $529 | $230 | $759 |
| Wyoming | 14.43¢ | $722 | $85 | $807 |
| Colorado | 17.17¢ | $687 | $142 | $829 |
| North Dakota | 13.31¢ | $772 | $71 | $843 |
| Indiana | 17.02¢ | $681 | $171 | $852 |
| Delaware | 18.70¢ | $636 | $221 | $857 |
| Montana | 15.57¢ | $778 | $83 | $861 |
| South Dakota | 15.15¢ | $758 | $117 | $874 |
| California | 29.75¢ | $536 | $352 | $888 |
| Iowa | 17.06¢ | $785 | $152 | $936 |
| Ohio | 19.38¢ | $775 | $184 | $959 |
| Maryland | 21.40¢ | $728 | $253 | $981 |
| Illinois | 19.32¢ | $811 | $183 | $994 |
| Minnesota | 17.20¢ | $929 | $112 | $1,041 |
| Pennsylvania | 21.77¢ | $871 | $206 | $1,077 |
| Wisconsin | 19.41¢ | $970 | $138 | $1,108 |
| New Jersey | 24.61¢ | $886 | $262 | $1,148 |
| District of Columbia | 25.98¢ | $831 | $338 | $1,170 |
| Michigan | 22.99¢ | $1,104 | $163 | $1,267 |
| Connecticut | 24.51¢ | $1,078 | $189 | $1,267 |
| Vermont | 23.84¢ | $1,240 | $127 | $1,367 |
| Rhode Island | 28.18¢ | $1,240 | $200 | $1,440 |
| New York | 28.65¢ | $1,261 | $221 | $1,481 |
| Hawaii | 47.18¢ | $47 | $1,453 | $1,500 |
| New Hampshire | 27.64¢ | $1,382 | $164 | $1,546 |
| Massachusetts | 30.48¢ | $1,402 | $217 | $1,619 |
| Alaska | 29.41¢ | $1,765 | $35 | $1,799 |
| Maine | 32.11¢ | $1,670 | $152 | $1,822 |
Similar-size alternatives
Other ducted split system units within ±15% of this model's cooling capacity, sorted by efficiency. Cost difference is versus the LG KUSXB181A at U.S.-average rates.
| Model | Cooling BTU/h | SEER2 | HSPF2 | 5°F kept | Est. yearly cost | |
|---|---|---|---|---|---|---|
| Midea MO1HE-H18B-2A | 18,000 | 15.2–19.3 | 10.8 | 103% | $748 (−$70) | Compare |
| Panasonic CU-HM18BAHU | 18,000 | 15.2–19 | 9.7 | 95% | $806 (−$12) | Compare |
| Day & Night D5CUHAH18AAK+KSAIC0701230 | 18,700 | 15.2–16.5 | 9 | 87% | $898 (+$80) | Compare |
| Daikin DH6VSA1810A* | 17,100 | 16–19 | 8.8 | 75% | $788 (−$30) | Compare |
| Lennox EL17XP1-018-230A** | 18,000 | 15.2–16.8 | 8.5 | 54% | $852 (+$34) | Compare |
| MrCool MHP17018A-**A | 18,000 | 15.2–16.8 | 8.1 | 47% | $879 (+$61) | Compare |
Full specifications
| Brand | LG |
| Outdoor model | KUSXB181A |
| Certified by | LG Electronics, Inc. |
| Product type | Ducted split system |
| Compressor | Variable-speed (inverter) |
| Refrigerant | R-32 |
| Cooling capacity | 18,000 BTU/h |
| Nominal size | 1.5 tons |
| SEER2 (certified range) | 15.2 – 17.5 |
| EER2 (best) | 13.5 |
| HSPF2 (best) | 10 |
| Heating capacity @ 47°F | 20,000 BTU/h |
| Heating capacity @ 17°F | 13,000 BTU/h |
| Heating capacity @ 5°F | 22,000 BTU/h |
| COP @ 5°F | 1.9 |
| ENERGY STAR cold-climate | Yes |
| Certified indoor pairings | 5 |
| Latest certification | 2026-09 |
Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), retrieved November 7, 2026. Capacities and HSPF2 are the highest values across certified pairings; confirm your exact system's AHRI reference number with your installer.
Frequently asked questions
How much does the LG KUSXB181A cost to run per year?
At the U.S. average residential electricity price of 18.16¢/kWh and typical national heating and cooling hours, we estimate about $818 per year ($581 heating, $237 cooling). It ranges from about $485 in Louisiana to $1,822 in Maine.
Does the LG KUSXB181A work in cold weather?
Yes. It is ENERGY STAR cold-climate certified and delivers 22,000 BTU/h at 5°F, 110% of its 47°F capacity, with a COP of 1.9 at 5°F.
What size is the LG KUSXB181A?
It is rated at 18,000 BTU/h of cooling, roughly 1.5 tons, and 20,000 BTU/h of heating at 47°F. Proper sizing should be confirmed with a Manual J load calculation.