Our take in 30 seconds
Best for: cold and very cold climatesStrengths
- Keeps 93% of its heat at 5°F, so backup heat rarely runs
- Heating efficiency (HSPF2 11.5) beats 95% of models
- Cooling efficiency up to SEER2 21.5, better than 78% of models
- Variable-speed compressor: quieter, steadier temperatures and better humidity control
Good to know
- Uses R-410A, a refrigerant being phased down; future service may cost more
Running-cost calculator
Pre-filled with EIA prices · edit any fieldUses the base certified SEER2 (19.2) and HSPF2 (11.5). 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 Senville SENA/24HF/OQ at the three ENERGY STAR test temperatures (cooling capacity is 24,000 BTU/h for reference).
Retention at 17°F: 73% · at 5°F: 93%. Learn how to use these numbers in our cold-climate guide.
Estimated running cost in every state
Same unit, very different bills: from about $549 a year in Louisiana to $2,266 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¢ | $227 | $322 | $549 |
| Florida | 14.99¢ | $170 | $450 | $620 |
| Mississippi | 14.43¢ | $327 | $325 | $652 |
| Nevada | 12.72¢ | $385 | $286 | $671 |
| Arizona | 15.05¢ | $266 | $414 | $680 |
| Washington | 14.63¢ | $627 | $64 | $691 |
| Tennessee | 13.42¢ | $474 | $218 | $692 |
| Oregon | 15.92¢ | $642 | $90 | $732 |
| North Carolina | 14.95¢ | $490 | $243 | $733 |
| Arkansas | 14.37¢ | $471 | $269 | $741 |
| Kentucky | 13.80¢ | $557 | $190 | $747 |
| South Carolina | 15.76¢ | $437 | $315 | $752 |
| Texas | 15.91¢ | $361 | $398 | $759 |
| Georgia | 15.90¢ | $441 | $318 | $759 |
| Alabama | 16.33¢ | $453 | $327 | $780 |
| Utah | 13.31¢ | $638 | $150 | $787 |
| Oklahoma | 14.82¢ | $523 | $278 | $801 |
| Idaho | 13.37¢ | $708 | $117 | $825 |
| New Mexico | 16.51¢ | $625 | $206 | $831 |
| Nebraska | 13.54¢ | $717 | $152 | $869 |
| West Virginia | 16.31¢ | $740 | $163 | $903 |
| Missouri | 16.02¢ | $687 | $220 | $907 |
| Virginia | 17.64¢ | $667 | $243 | $910 |
| Kansas | 15.47¢ | $702 | $213 | $915 |
| Wyoming | 14.43¢ | $910 | $90 | $1,000 |
| Colorado | 17.17¢ | $866 | $150 | $1,016 |
| Delaware | 18.70¢ | $802 | $234 | $1,035 |
| Indiana | 17.02¢ | $858 | $181 | $1,039 |
| California | 29.75¢ | $675 | $372 | $1,047 |
| North Dakota | 13.31¢ | $973 | $75 | $1,048 |
| Montana | 15.57¢ | $982 | $88 | $1,069 |
| South Dakota | 15.15¢ | $955 | $123 | $1,078 |
| Iowa | 17.06¢ | $989 | $160 | $1,149 |
| Ohio | 19.38¢ | $977 | $194 | $1,171 |
| Maryland | 21.40¢ | $917 | $268 | $1,185 |
| Illinois | 19.32¢ | $1,023 | $193 | $1,216 |
| Minnesota | 17.20¢ | $1,171 | $118 | $1,289 |
| Pennsylvania | 21.77¢ | $1,098 | $218 | $1,316 |
| Wisconsin | 19.41¢ | $1,224 | $146 | $1,369 |
| New Jersey | 24.61¢ | $1,117 | $277 | $1,394 |
| District of Columbia | 25.98¢ | $1,048 | $357 | $1,405 |
| Connecticut | 24.51¢ | $1,360 | $199 | $1,559 |
| Michigan | 22.99¢ | $1,391 | $172 | $1,564 |
| Hawaii | 47.18¢ | $59 | $1,533 | $1,593 |
| Vermont | 23.84¢ | $1,563 | $134 | $1,697 |
| Rhode Island | 28.18¢ | $1,563 | $211 | $1,775 |
| New York | 28.65¢ | $1,589 | $233 | $1,822 |
| New Hampshire | 27.64¢ | $1,743 | $173 | $1,915 |
| Massachusetts | 30.48¢ | $1,768 | $229 | $1,996 |
| Alaska | 29.41¢ | $2,225 | $37 | $2,262 |
| Maine | 32.11¢ | $2,105 | $161 | $2,266 |
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 Senville SENA/24HF/OQ at U.S.-average rates.
| Model | Cooling BTU/h | SEER2 | HSPF2 | 5°F kept | Est. yearly cost | |
|---|---|---|---|---|---|---|
| Senville SENA-24HF-OG | 24,000 | 19–21 | 13.5 | 83% | $876 (−$106) | Compare |
| Pioneer YN024GMFI22RPE | 24,000 | 19–21.5 | 11.2 | 80% | $901 (−$82) | Compare |
| Hisense AOU-24U3T25U | 24,000 | 19–20 | 10.5 | 100% | $916 (−$66) | Compare |
| Pioneer YN024GLSI24RPG | 23,000 | 19–23 | 10.4 | 76% | $940 (−$42) | Compare |
| Mitsubishi Electric PUZ-AK24NLHZ2*** | 24,000 | 17–22.8 | 10.8 | 100% | $982 (−$1) | Compare |
| Gree GWH18AVEXF-D6DNA1A/O | 21,000 | 20–27.5 | 10 | 86% | $820 (−$162) | Compare |
Full specifications
| Brand | Senville |
| Outdoor model | SENA/24HF/OQ |
| Certified by | Senville Air Conditioners |
| Product type | Mini-split / multi-split |
| Compressor | Variable-speed (inverter) |
| Refrigerant | R-410A |
| Cooling capacity | 24,000 BTU/h |
| Nominal size | 2 tons |
| SEER2 (certified range) | 19.2 – 21.5 |
| EER2 (best) | 13 |
| HSPF2 (best) | 11.5 |
| Heating capacity @ 47°F | 29,000 BTU/h |
| Heating capacity @ 17°F | 21,200 BTU/h |
| Heating capacity @ 5°F | 27,000 BTU/h |
| COP @ 5°F | 2.21 |
| ENERGY STAR cold-climate | Yes |
| Certified indoor pairings | 7 |
| 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 Senville SENA/24HF/OQ 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 $982 per year ($733 heating, $250 cooling). It ranges from about $549 in Louisiana to $2,266 in Maine.
Does the Senville SENA/24HF/OQ work in cold weather?
Yes. It is ENERGY STAR cold-climate certified and delivers 27,000 BTU/h at 5°F, 93% of its 47°F capacity, with a COP of 2.21 at 5°F.
What size is the Senville SENA/24HF/OQ?
It is rated at 24,000 BTU/h of cooling, roughly 2 tons, and 29,000 BTU/h of heating at 47°F. Proper sizing should be confirmed with a Manual J load calculation.