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
- 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 (15.7) and HSPF2 (9.4). 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-36MTB-M18S at the three ENERGY STAR test temperatures (cooling capacity is 36,000 BTU/h for reference).
Retention at 17°F: 87% · 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 $935 a year in Louisiana to $3,492 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¢ | $345 | $590 | $935 |
| Washington | 14.63¢ | $953 | $117 | $1,070 |
| Florida | 14.99¢ | $258 | $825 | $1,083 |
| Mississippi | 14.43¢ | $497 | $596 | $1,093 |
| Nevada | 12.72¢ | $585 | $525 | $1,110 |
| Tennessee | 13.42¢ | $720 | $400 | $1,120 |
| Oregon | 15.92¢ | $976 | $164 | $1,140 |
| Arizona | 15.05¢ | $403 | $759 | $1,163 |
| North Carolina | 14.95¢ | $744 | $446 | $1,190 |
| Kentucky | 13.80¢ | $846 | $348 | $1,194 |
| Arkansas | 14.37¢ | $715 | $494 | $1,210 |
| South Carolina | 15.76¢ | $664 | $578 | $1,242 |
| Utah | 13.31¢ | $969 | $275 | $1,243 |
| Georgia | 15.90¢ | $670 | $583 | $1,253 |
| Texas | 15.91¢ | $548 | $730 | $1,278 |
| Alabama | 16.33¢ | $688 | $599 | $1,287 |
| Idaho | 13.37¢ | $1,075 | $215 | $1,290 |
| Oklahoma | 14.82¢ | $795 | $510 | $1,304 |
| New Mexico | 16.51¢ | $948 | $379 | $1,327 |
| Nebraska | 13.54¢ | $1,089 | $279 | $1,368 |
| West Virginia | 16.31¢ | $1,124 | $299 | $1,424 |
| Missouri | 16.02¢ | $1,043 | $404 | $1,447 |
| Kansas | 15.47¢ | $1,066 | $390 | $1,457 |
| Virginia | 17.64¢ | $1,013 | $445 | $1,458 |
| Wyoming | 14.43¢ | $1,382 | $165 | $1,547 |
| Colorado | 17.17¢ | $1,315 | $276 | $1,591 |
| North Dakota | 13.31¢ | $1,478 | $137 | $1,616 |
| Indiana | 17.02¢ | $1,304 | $332 | $1,635 |
| Delaware | 18.70¢ | $1,217 | $429 | $1,646 |
| Montana | 15.57¢ | $1,491 | $161 | $1,651 |
| South Dakota | 15.15¢ | $1,451 | $226 | $1,676 |
| California | 29.75¢ | $1,025 | $682 | $1,708 |
| Iowa | 17.06¢ | $1,503 | $293 | $1,796 |
| Ohio | 19.38¢ | $1,484 | $356 | $1,840 |
| Maryland | 21.40¢ | $1,393 | $491 | $1,884 |
| Illinois | 19.32¢ | $1,554 | $354 | $1,908 |
| Minnesota | 17.20¢ | $1,779 | $217 | $1,995 |
| Pennsylvania | 21.77¢ | $1,667 | $399 | $2,067 |
| Wisconsin | 19.41¢ | $1,858 | $267 | $2,125 |
| New Jersey | 24.61¢ | $1,697 | $508 | $2,204 |
| District of Columbia | 25.98¢ | $1,592 | $655 | $2,247 |
| Michigan | 22.99¢ | $2,113 | $316 | $2,429 |
| Connecticut | 24.51¢ | $2,065 | $365 | $2,430 |
| Vermont | 23.84¢ | $2,374 | $246 | $2,620 |
| Rhode Island | 28.18¢ | $2,374 | $388 | $2,762 |
| New York | 28.65¢ | $2,414 | $427 | $2,841 |
| Hawaii | 47.18¢ | $90 | $2,813 | $2,903 |
| New Hampshire | 27.64¢ | $2,646 | $317 | $2,963 |
| Massachusetts | 30.48¢ | $2,685 | $419 | $3,104 |
| Alaska | 29.41¢ | $3,379 | $67 | $3,446 |
| Maine | 32.11¢ | $3,197 | $295 | $3,492 |
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-36MTB-M18S at U.S.-average rates.
| Model | Cooling BTU/h | SEER2 | HSPF2 | 5°F kept | Est. yearly cost | |
|---|---|---|---|---|---|---|
| Ruud UP19AY36AJVC | 34,200 | 19–21 | 10 | 87% | $1,353 (−$218) | Compare |
| Bryant 37MUHAQ36AA3 | 36,000 | 15.8–18 | 10.3 | 103% | $1,527 (−$44) | Compare |
| Daikin DH9VSA361CA* | 34,200 | 16.9–21 | 10 | 100% | $1,398 (−$173) | Compare |
| Panasonic CU-HM36BAHU | 36,000 | 15.6–17.4 | 10.3 | 103% | $1,533 (−$38) | Compare |
| MrCool CENTRAL-36-HP-C-230B00-O | 36,000 | 15.2–17.4 | 10.3 | 103% | $1,545 (−$26) | Compare |
| Midea MO1SE-H36B-2A | 36,000 | 15.2–18 | 10.3 | 103% | $1,545 (−$26) | Compare |
Full specifications
| Brand | Bosch |
| Outdoor model | BOHA-36MTB-M18S |
| Certified by | Bosch Thermotechnology Corporation |
| Product type | Ducted split system |
| Compressor | Variable-speed (inverter) |
| Refrigerant | R-454B |
| Cooling capacity | 36,000 BTU/h |
| Nominal size | 3 tons |
| SEER2 (certified range) | 15.7 – 17.2 |
| EER2 (best) | 11.7 |
| HSPF2 (best) | 9.4 |
| Heating capacity @ 47°F | 36,000 BTU/h |
| Heating capacity @ 17°F | 31,200 BTU/h |
| Heating capacity @ 5°F | 36,000 BTU/h |
| COP @ 5°F | 2 |
| ENERGY STAR cold-climate | Yes |
| Certified indoor pairings | 16 |
| 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-36MTB-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 $1,571 per year ($1,113 heating, $458 cooling). It ranges from about $935 in Louisiana to $3,492 in Maine.
Does the Bosch BOHA-36MTB-M18S work in cold weather?
Yes. It is ENERGY STAR cold-climate certified and delivers 36,000 BTU/h at 5°F, 100% of its 47°F capacity, with a COP of 2 at 5°F.
What size is the Bosch BOHA-36MTB-M18S?
It is rated at 36,000 BTU/h of cooling, roughly 3 tons, and 36,000 BTU/h of heating at 47°F. Proper sizing should be confirmed with a Manual J load calculation.