Our take in 30 seconds
Best for: mixed climates with occasional hard freezesStrengths
- 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 (15.5) and HSPF2 (8.5). 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 Bosch BOHA-24RTB-M18S at the three ENERGY STAR test temperatures (cooling capacity is 23,000 BTU/h for reference).
Retention at 17°F: 75% · at 5°F: 73%. Learn how to use these numbers in our cold-climate guide.
Estimated running cost in every state
Same unit, very different bills: from about $636 a year in Louisiana to $2,548 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¢ | $254 | $382 | $636 |
| Florida | 14.99¢ | $190 | $534 | $724 |
| Mississippi | 14.43¢ | $367 | $385 | $752 |
| Nevada | 12.72¢ | $431 | $340 | $771 |
| Washington | 14.63¢ | $702 | $76 | $778 |
| Arizona | 15.05¢ | $297 | $491 | $789 |
| Tennessee | 13.42¢ | $530 | $259 | $789 |
| Oregon | 15.92¢ | $719 | $106 | $826 |
| North Carolina | 14.95¢ | $549 | $288 | $837 |
| Arkansas | 14.37¢ | $527 | $320 | $847 |
| Kentucky | 13.80¢ | $623 | $225 | $849 |
| South Carolina | 15.76¢ | $489 | $374 | $864 |
| Georgia | 15.90¢ | $494 | $377 | $871 |
| Texas | 15.91¢ | $404 | $472 | $876 |
| Utah | 13.31¢ | $714 | $178 | $892 |
| Alabama | 16.33¢ | $507 | $388 | $895 |
| Oklahoma | 14.82¢ | $586 | $330 | $916 |
| Idaho | 13.37¢ | $793 | $139 | $932 |
| New Mexico | 16.51¢ | $699 | $245 | $944 |
| Nebraska | 13.54¢ | $803 | $181 | $984 |
| West Virginia | 16.31¢ | $829 | $194 | $1,023 |
| Missouri | 16.02¢ | $769 | $261 | $1,030 |
| Virginia | 17.64¢ | $747 | $288 | $1,035 |
| Kansas | 15.47¢ | $786 | $253 | $1,039 |
| Wyoming | 14.43¢ | $1,019 | $107 | $1,126 |
| Colorado | 17.17¢ | $970 | $178 | $1,148 |
| Delaware | 18.70¢ | $898 | $277 | $1,175 |
| Indiana | 17.02¢ | $961 | $215 | $1,176 |
| North Dakota | 13.31¢ | $1,090 | $89 | $1,179 |
| California | 29.75¢ | $756 | $441 | $1,197 |
| Montana | 15.57¢ | $1,099 | $104 | $1,203 |
| South Dakota | 15.15¢ | $1,069 | $146 | $1,216 |
| Iowa | 17.06¢ | $1,108 | $190 | $1,298 |
| Ohio | 19.38¢ | $1,094 | $230 | $1,324 |
| Maryland | 21.40¢ | $1,027 | $318 | $1,345 |
| Illinois | 19.32¢ | $1,146 | $229 | $1,375 |
| Minnesota | 17.20¢ | $1,311 | $140 | $1,452 |
| Pennsylvania | 21.77¢ | $1,229 | $258 | $1,488 |
| Wisconsin | 19.41¢ | $1,370 | $173 | $1,543 |
| New Jersey | 24.61¢ | $1,251 | $329 | $1,579 |
| District of Columbia | 25.98¢ | $1,174 | $424 | $1,598 |
| Connecticut | 24.51¢ | $1,523 | $236 | $1,759 |
| Michigan | 22.99¢ | $1,558 | $205 | $1,763 |
| Hawaii | 47.18¢ | $67 | $1,820 | $1,887 |
| Vermont | 23.84¢ | $1,750 | $159 | $1,909 |
| Rhode Island | 28.18¢ | $1,750 | $251 | $2,001 |
| New York | 28.65¢ | $1,780 | $276 | $2,056 |
| New Hampshire | 27.64¢ | $1,951 | $205 | $2,156 |
| Massachusetts | 30.48¢ | $1,979 | $271 | $2,251 |
| Alaska | 29.41¢ | $2,491 | $44 | $2,535 |
| Maine | 32.11¢ | $2,357 | $191 | $2,548 |
Similar-size alternatives
Other ducted split system units within ±15% of this model's cooling capacity, sorted by efficiency. Cost difference is versus the Bosch BOHA-24RTB-M18S at U.S.-average rates.
| Model | Cooling BTU/h | SEER2 | HSPF2 | 5°F kept | Est. yearly cost | |
|---|---|---|---|---|---|---|
| Carrier 27VNA324A*030* | 23,800 | 18–23 | 10.5 | 82% | $1,044 (−$72) | Compare |
| Rheem RP19AY24AJVC | 22,800 | 20–21 | 10 | 81% | $925 (−$192) | Compare |
| Trane 5TWR7024A1 | 24,000 | 15.2–17.1 | 11 | 79% | $907 (−$210) | Compare |
| Trane 5TWX7024A1 | 24,000 | 15.2–18 | 11 | 79% | $907 (−$210) | Compare |
| Bryant 37MUHAQ24AA3 | 24,000 | 16–18.7 | 10.5 | 86% | $991 (−$125) | Compare |
| ACiQ ACIQ-24-HPD | 24,000 | 16–18.6 | 10.5 | 83% | $1,019 (−$98) | Compare |
Full specifications
| Brand | Bosch |
| Outdoor model | BOHA-24RTB-M18S |
| Certified by | Bosch Thermotechnology Corporation |
| Product type | Ducted split system |
| Compressor | Variable-speed (inverter) |
| Refrigerant | R-454B |
| Cooling capacity | 23,000 BTU/h |
| Nominal size | 2 tons |
| SEER2 (certified range) | 15.5 – 16.7 |
| EER2 (best) | 11 |
| HSPF2 (best) | 8.5 |
| Heating capacity @ 47°F | 24,000 BTU/h |
| Heating capacity @ 17°F | 18,000 BTU/h |
| Heating capacity @ 5°F | 17,500 BTU/h |
| COP @ 5°F | 1.8 |
| ENERGY STAR cold-climate | Yes |
| Certified indoor pairings | 9 |
| Latest certification | 2026-04 |
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 Bosch BOHA-24RTB-M18S 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 $1,117 per year ($820 heating, $296 cooling). It ranges from about $636 in Louisiana to $2,548 in Maine.
Does the Bosch BOHA-24RTB-M18S work in cold weather?
Yes. It is ENERGY STAR cold-climate certified and delivers 17,500 BTU/h at 5°F, 73% of its 47°F capacity, with a COP of 1.8 at 5°F.
What size is the Bosch BOHA-24RTB-M18S?
It is rated at 23,000 BTU/h of cooling, roughly 2 tons, and 24,000 BTU/h of heating at 47°F. Proper sizing should be confirmed with a Manual J load calculation.