What is the SEER2 rating of the Bosch BOHA-24RTB-M18S?

The Bosch BOHA-24RTB-M18S is rated at up to 18.0 SEER2 and 11.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 12 certified matchups SEER2 ranges from 15.5-18.0.

Is the Bosch BOHA-24RTB-M18S good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 20,000 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.

How much does the Bosch BOHA-24RTB-M18S cost to run per year?

At its rated efficiency it costs about $600-$1,598 a year in electricity in large U.S. cities, depending on climate and local rates - for example $739 in Phoenix and $1,334 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Which indoor units work with the Bosch BOHA-24RTB-M18S?

ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use BIVB-24RCB-M20X, BIVA-24RCB-M20X, BIVA-24VCB-M18X.

2-ton central heat pump · IDS Edge

Bosch BOHA-24RTB-M18S

Average cooling efficiency and very good heating efficiency for a 2-ton central heat pump, and certified for cold climates.

Ranks #161 of 331 2 ton central heat pumps for cooling efficiency, and costs about $669 a year to run in a mixed climate like Atlanta.

SEER2: 18.0 Cooling efficiency over a season
Average · beats 66%
HSPF2: 9.5 Heating efficiency over a season
Very good · beats 70%
EER2: 11.0 Cooling efficiency on a 95°F day
Below average · beats 23%
Heat at 5°F: 20,000 BTU/h77% of its 47°F output
Below average · beats 5%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 20,000 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 70% of central heat pumps.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 12 certified pairings.

Think twice if…

Nothing stands out - its ratings have no weak spot for its class.

Calculate my running cost

Details

Specifications2 ton, R-454B

General
Brand	Bosch
Outdoor unit model	BOHA-24RTB-M18S
Series	IDS Edge
Type	Central heat pump
Nominal size	2 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	January 1, 2026
Last certified	April 27, 2026
Cooling
SEER2Seasonal efficiency, higher is better	18.0 (range 15.5-18.0)
EER2Efficiency at 95°F outdoors	10.0-11.0
Cooling capacity	18,000-24,400 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.1-9.5
Capacity at 47°F	18,000-26,000 BTU/h
Capacity at 17°F	15,600-18,300 BTU/h
Capacity at 5°F	16,800-20,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.75-1.80
ENERGY STAR cold climate	Yes

Heating output as it gets colder77% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its best matchup at the standard test temperatures, in BTU/h:

Certified matchups12 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. Ask your installer for the AHRI reference number of the exact system you are quoted.

Indoor unit	Furnace	SEER2	EER2	HSPF2	Heat @5°F	AHRI ref.
- BOSCH · cold climate	-	18.0	11.0	9.1	20,000	218043840
- BOSCH · cold climate	-	17.3	11.0	9.5	20,000	218043841
BIVB-24RCB-M20X · cold climate	-	16.7	11.0	8.5	17,500	218032246
BIVB-24RCB-M20X · cold climate	-	16.7	11.0	8.5	17,500	218160628
BIVA-24RCB-M20X · cold climate	-	16.7	11.0	8.5	17,500	218160620
- BOSCH · cold climate	-	16.5	11.0	8.5	20,000	218043838
BIVA-24VCB-M18X · cold climate	-	16.5	11.0	8.5	17,500	218032260
BIVA-18VCB-M18X · cold climate	-	16.5	11.0	8.5	17,500	218032259
BMAC2430BBTA · cold climate	BGH97M080B3A	15.5	10.0	8.4	17,500	218032257
BMAC2430BBTA · cold climate	BGH97M060B3A	15.5	10.0	8.2	17,500	218032256
BMAC2430ABTA · cold climate	BGH97M060B3A	15.5	10.0	8.1	16,800	218032254
BMAC2430ABTA · cold climate	BGH97M080B3A	15.5	10.0	8.1	16,800	218032253

Yearly running cost in 10 large cities$600-$1,598

Phoenix, AZ$739/yr
Miami, FL$600/yr
Houston, TX$662/yr
Atlanta, GA$669/yr
Los Angeles, CA$651/yr
New York, NY$1,598/yr
Chicago, IL$1,297/yr
Denver, CO$1,078/yr
Seattle, WA$662/yr
Minneapolis, MN$1,334/yr

At each state's average electricity price and the city's typical heating and cooling hours.

Questions5

What is the SEER2 rating of the Bosch BOHA-24RTB-M18S?: The Bosch BOHA-24RTB-M18S is rated at up to 18.0 SEER2 and 11.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 12 certified matchups SEER2 ranges from 15.5-18.0.
Is the Bosch BOHA-24RTB-M18S good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 20,000 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
How much does the Bosch BOHA-24RTB-M18S cost to run per year?: At its rated efficiency it costs about $600-$1,598 a year in electricity in large U.S. cities, depending on climate and local rates - for example $739 in Phoenix and $1,334 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Which indoor units work with the Bosch BOHA-24RTB-M18S?: ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use BIVB-24RCB-M20X, BIVA-24RCB-M20X, BIVA-24VCB-M18X.
What refrigerant does the Bosch BOHA-24RTB-M18S use?: It uses R-454B.

Running cost and savings

Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

Heat pump $733/yrYou save $470/yrSee details ↓

1. Where you live

StateCityElectricity ¢ per kWh

Adjust heating and cooling hours

Filled in from your city's climate. Change them if you run the system much more or less than usual.

Cooling hours full-load hours per yearHeating hours full-load hours per year

2. The heat pump Bosch BOHA-24RTB-M18S

Find a model (fills in the ratings below)

SEER2 cooling efficiencyHSPF2 heating efficiencyCooling capacity BTU/hHeating capacity BTU/h

3. What it replaces

Current heatingFurnace efficiency (AFUE %)Gas price, $/thermCurrent coolingOld AC rating SEER2 (10 ≈ 15+ years old)

4. Price replace the example with your quote

Installed price, $Rebates and incentives, $ utility, state

Heat pump, per year: $733
Current system, per year: $1,202
You save per year: $470
Payback: 18.1 years
Net after 10 years: -$3,804

Cooling $450Heating $283Electricity used: 4,580 kWhSaved vs. a minimum-efficiency heat pump: $192

Estimates use the unit's rated SEER2 and HSPF2, full-load hours derived from NOAA 1991-2020 degree days, average residential electricity prices from the U.S. EIA (12 months to July 2026) and fuel prices from EIA (2025 for natural gas, week of 2026-10-05 for propane and heating oil). Very cold days that need backup heat are not modelled. Federal minimum for comparison: 14.3 SEER2 / 7.5 HSPF2.

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See all 331 2 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of April 27, 2026. How we use the data.