Our take in 30 seconds
Best for: cold and very cold climatesStrengths
- Keeps 100% of its heat at 5°F, so backup heat rarely runs
- Heating efficiency (HSPF2 10.2) beats 78% of models
- Variable-speed compressor: quieter, steadier temperatures and better humidity control
- Uses newer, lower-impact R-454B 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 (16.2) and HSPF2 (10.2). 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 Mitsubishi Electric SUZ-AA18NLHZ*** at the three ENERGY STAR test temperatures (cooling capacity is 18,000 BTU/h for reference).
Retention at 17°F: 67% · at 5°F: 100%. Learn how to use these numbers in our cold-climate guide.
Estimated running cost in every state
Same unit, very different bills: from about $463 a year in Louisiana to $1,780 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¢ | $177 | $286 | $463 |
| Florida | 14.99¢ | $132 | $400 | $532 |
| Mississippi | 14.43¢ | $255 | $289 | $543 |
| Washington | 14.63¢ | $488 | $57 | $545 |
| Nevada | 12.72¢ | $299 | $254 | $554 |
| Tennessee | 13.42¢ | $368 | $194 | $562 |
| Arizona | 15.05¢ | $207 | $368 | $574 |
| Oregon | 15.92¢ | $499 | $80 | $579 |
| North Carolina | 14.95¢ | $381 | $216 | $597 |
| Kentucky | 13.80¢ | $433 | $169 | $602 |
| Arkansas | 14.37¢ | $366 | $240 | $606 |
| South Carolina | 15.76¢ | $340 | $280 | $620 |
| Georgia | 15.90¢ | $343 | $283 | $626 |
| Utah | 13.31¢ | $496 | $133 | $629 |
| Texas | 15.91¢ | $281 | $354 | $634 |
| Alabama | 16.33¢ | $352 | $290 | $643 |
| Oklahoma | 14.82¢ | $407 | $247 | $654 |
| Idaho | 13.37¢ | $551 | $104 | $655 |
| New Mexico | 16.51¢ | $486 | $183 | $669 |
| Nebraska | 13.54¢ | $558 | $135 | $693 |
| West Virginia | 16.31¢ | $576 | $145 | $721 |
| Missouri | 16.02¢ | $534 | $196 | $730 |
| Virginia | 17.64¢ | $519 | $216 | $734 |
| Kansas | 15.47¢ | $546 | $189 | $735 |
| Wyoming | 14.43¢ | $707 | $80 | $788 |
| Colorado | 17.17¢ | $673 | $134 | $807 |
| North Dakota | 13.31¢ | $757 | $67 | $823 |
| Indiana | 17.02¢ | $667 | $161 | $828 |
| Delaware | 18.70¢ | $623 | $208 | $831 |
| Montana | 15.57¢ | $763 | $78 | $841 |
| South Dakota | 15.15¢ | $743 | $109 | $852 |
| California | 29.75¢ | $525 | $331 | $856 |
| Iowa | 17.06¢ | $769 | $142 | $912 |
| Ohio | 19.38¢ | $760 | $172 | $932 |
| Maryland | 21.40¢ | $713 | $238 | $951 |
| Illinois | 19.32¢ | $796 | $172 | $967 |
| Minnesota | 17.20¢ | $911 | $105 | $1,016 |
| Pennsylvania | 21.77¢ | $854 | $194 | $1,047 |
| Wisconsin | 19.41¢ | $951 | $129 | $1,081 |
| New Jersey | 24.61¢ | $869 | $246 | $1,115 |
| District of Columbia | 25.98¢ | $815 | $318 | $1,133 |
| Connecticut | 24.51¢ | $1,057 | $177 | $1,234 |
| Michigan | 22.99¢ | $1,082 | $153 | $1,235 |
| Vermont | 23.84¢ | $1,215 | $119 | $1,335 |
| Rhode Island | 28.18¢ | $1,216 | $188 | $1,403 |
| Hawaii | 47.18¢ | $46 | $1,363 | $1,409 |
| New York | 28.65¢ | $1,236 | $207 | $1,443 |
| New Hampshire | 27.64¢ | $1,355 | $154 | $1,508 |
| Massachusetts | 30.48¢ | $1,375 | $203 | $1,578 |
| Alaska | 29.41¢ | $1,730 | $33 | $1,763 |
| Maine | 32.11¢ | $1,637 | $143 | $1,780 |
Similar-size alternatives
Other mini-split / multi-split units within ±15% of this model's cooling capacity, sorted by efficiency. Cost difference is versus the Mitsubishi Electric SUZ-AA18NLHZ*** at U.S.-average rates.
| Model | Cooling BTU/h | SEER2 | HSPF2 | 5°F kept | Est. yearly cost | |
|---|---|---|---|---|---|---|
| Bryant 37MARAQ18AA3 | 18,000 | 20–23.9 | 13.5 | 71% | $610 (−$181) | Compare |
| Bryant 37MAHAQ18AA3 | 18,000 | 18–21.5 | 12.4 | 90% | $668 (−$123) | Compare |
| Senville SENA-18HF-OG | 18,000 | 18–21.4 | 12.3 | 90% | $672 (−$119) | Compare |
| Fujitsu AOUH18KUAS1 | 18,000 | 18.6–26.3 | 11.4 | 82% | $744 (−$48) | Compare |
| Fujitsu AOUH18LUAS1 | 18,000 | 18.6–23.5 | 11.2 | 95% | $660 (−$131) | Compare |
| Senville SENA/18HF/OQ | 18,000 | 18–21.5 | 11.3 | 95% | $688 (−$103) | Compare |
Full specifications
| Brand | Mitsubishi Electric |
| Outdoor model | SUZ-AA18NLHZ*** |
| Certified by | Mitsubishi Electric U.S. HVAC Division |
| Product type | Mini-split / multi-split |
| Compressor | Variable-speed (inverter) |
| Refrigerant | R-454B |
| Cooling capacity | 18,000 BTU/h |
| Nominal size | 1.5 tons |
| SEER2 (certified range) | 16.2 – 17.5 |
| EER2 (best) | 12.8 |
| HSPF2 (best) | 10.2 |
| Heating capacity @ 47°F | 20,000 BTU/h |
| Heating capacity @ 17°F | 13,400 BTU/h |
| Heating capacity @ 5°F | 20,000 BTU/h |
| COP @ 5°F | 2.1 |
| ENERGY STAR cold-climate | Yes |
| Certified indoor pairings | 12 |
| Latest certification | 2026-06 |
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 Mitsubishi Electric SUZ-AA18NLHZ*** 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 $792 per year ($570 heating, $222 cooling). It ranges from about $463 in Louisiana to $1,780 in Maine.
Does the Mitsubishi Electric SUZ-AA18NLHZ*** work in cold weather?
Yes. It is ENERGY STAR cold-climate certified and delivers 20,000 BTU/h at 5°F, 100% of its 47°F capacity, with a COP of 2.1 at 5°F.
What size is the Mitsubishi Electric SUZ-AA18NLHZ***?
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.