Our take in 30 seconds
Best for: cold and very cold climatesStrengths
- Keeps 83% of its heat at 5°F, so backup heat rarely runs
- 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 (15.2) and HSPF2 (9.25). 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-24MTB-M18S at the three ENERGY STAR test temperatures (cooling capacity is 24,000 BTU/h for reference).
Retention at 17°F: 88% · at 5°F: 83%. Learn how to use these numbers in our cold-climate guide.
Estimated running cost in every state
Same unit, very different bills: from about $640 a year in Louisiana to $2,369 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¢ | $234 | $406 | $640 |
| Washington | 14.63¢ | $645 | $81 | $726 |
| Florida | 14.99¢ | $175 | $568 | $743 |
| Mississippi | 14.43¢ | $337 | $410 | $747 |
| Nevada | 12.72¢ | $396 | $362 | $758 |
| Tennessee | 13.42¢ | $487 | $275 | $763 |
| Oregon | 15.92¢ | $661 | $113 | $774 |
| Arizona | 15.05¢ | $273 | $523 | $796 |
| North Carolina | 14.95¢ | $504 | $307 | $811 |
| Kentucky | 13.80¢ | $573 | $240 | $813 |
| Arkansas | 14.37¢ | $485 | $340 | $825 |
| Utah | 13.31¢ | $656 | $189 | $845 |
| South Carolina | 15.76¢ | $450 | $398 | $848 |
| Georgia | 15.90¢ | $454 | $402 | $855 |
| Texas | 15.91¢ | $372 | $502 | $874 |
| Idaho | 13.37¢ | $728 | $148 | $876 |
| Alabama | 16.33¢ | $466 | $413 | $879 |
| Oklahoma | 14.82¢ | $538 | $351 | $889 |
| New Mexico | 16.51¢ | $643 | $261 | $903 |
| Nebraska | 13.54¢ | $738 | $192 | $930 |
| West Virginia | 16.31¢ | $762 | $206 | $968 |
| Missouri | 16.02¢ | $707 | $278 | $985 |
| Kansas | 15.47¢ | $722 | $269 | $991 |
| Virginia | 17.64¢ | $687 | $306 | $993 |
| Wyoming | 14.43¢ | $936 | $114 | $1,050 |
| Colorado | 17.17¢ | $891 | $190 | $1,081 |
| North Dakota | 13.31¢ | $1,001 | $95 | $1,096 |
| Indiana | 17.02¢ | $883 | $228 | $1,112 |
| Delaware | 18.70¢ | $825 | $295 | $1,120 |
| Montana | 15.57¢ | $1,010 | $111 | $1,121 |
| South Dakota | 15.15¢ | $983 | $155 | $1,138 |
| California | 29.75¢ | $695 | $470 | $1,164 |
| Iowa | 17.06¢ | $1,018 | $202 | $1,220 |
| Ohio | 19.38¢ | $1,006 | $245 | $1,250 |
| Maryland | 21.40¢ | $944 | $338 | $1,282 |
| Illinois | 19.32¢ | $1,053 | $244 | $1,297 |
| Minnesota | 17.20¢ | $1,205 | $149 | $1,354 |
| Pennsylvania | 21.77¢ | $1,130 | $275 | $1,405 |
| Wisconsin | 19.41¢ | $1,259 | $184 | $1,443 |
| New Jersey | 24.61¢ | $1,149 | $350 | $1,499 |
| District of Columbia | 25.98¢ | $1,079 | $451 | $1,530 |
| Michigan | 22.99¢ | $1,432 | $218 | $1,649 |
| Connecticut | 24.51¢ | $1,399 | $252 | $1,651 |
| Vermont | 23.84¢ | $1,608 | $169 | $1,778 |
| Rhode Island | 28.18¢ | $1,609 | $267 | $1,876 |
| New York | 28.65¢ | $1,635 | $294 | $1,929 |
| Hawaii | 47.18¢ | $61 | $1,937 | $1,998 |
| New Hampshire | 27.64¢ | $1,793 | $218 | $2,011 |
| Massachusetts | 30.48¢ | $1,819 | $289 | $2,108 |
| Alaska | 29.41¢ | $2,289 | $46 | $2,336 |
| Maine | 32.11¢ | $2,166 | $203 | $2,369 |
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-24MTB-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 (−$25) | Compare |
| Rheem RP19AY24AJVC | 22,800 | 20–21 | 10 | 81% | $925 (−$144) | Compare |
| Trane 5TWR7024A1 | 24,000 | 15.2–17.1 | 11 | 79% | $907 (−$162) | Compare |
| Trane 5TWX7024A1 | 24,000 | 15.2–18 | 11 | 79% | $907 (−$162) | Compare |
| Bryant 37MUHAQ24AA3 | 24,000 | 16–18.7 | 10.5 | 86% | $991 (−$78) | Compare |
| ACiQ ACIQ-24-HPD | 24,000 | 16–18.6 | 10.5 | 83% | $1,019 (−$50) | Compare |
Full specifications
| Brand | Bosch |
| Outdoor model | BOHA-24MTB-M18S |
| Certified by | Bosch Thermotechnology Corporation |
| Product type | Ducted split system |
| Compressor | Variable-speed (inverter) |
| Refrigerant | R-454B |
| Cooling capacity | 24,000 BTU/h |
| Nominal size | 2 tons |
| SEER2 (certified range) | 15.2 – 17.7 |
| EER2 (best) | 12 |
| HSPF2 (best) | 9.25 |
| Heating capacity @ 47°F | 24,000 BTU/h |
| Heating capacity @ 17°F | 21,000 BTU/h |
| Heating capacity @ 5°F | 20,000 BTU/h |
| COP @ 5°F | 2 |
| 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 Bosch BOHA-24MTB-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 $1,069 per year ($754 heating, $315 cooling). It ranges from about $640 in Louisiana to $2,369 in Maine.
Does the Bosch BOHA-24MTB-M18S work in cold weather?
Yes. It is ENERGY STAR cold-climate certified and delivers 20,000 BTU/h at 5°F, 83% of its 47°F capacity, with a COP of 2 at 5°F.
What size is the Bosch BOHA-24MTB-M18S?
It is rated at 24,000 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.