Home / Comparisons / 12,000 BTU wall-mounted heat pumps
BOSCH Climate 5000 Regular and MAX PERFORMANCE R-454B: same season, not the same extreme cold
Same wall unit, same R-454B refrigerant, and the same HSPF2 Region V of 8.0: over a whole season, both certificates give the same heating efficiency. The difference appears when the cold sets in. The MAX PERFORMANCE keeps more heat at every published cold temperature, and BOSCH rates it down to −30 °C, against −25 °C for the Regular.
Climate 5000 Regular R-454B, 12,000 BTU
AHRI 215223298
Per BOSCH: heating from −25 to 24 °C; 62.17 lb outdoor unit.
See the product pageHSPF2 Region V, on a scale of 0 to 10: the same season for both.
Climate 5000 MAX PERFORMANCE R-454B, 12,000 BTU
AHRI 215223282
Same AHRI and NEEP certified values as: SENVILLE AURA R454B, MIDEA MIDEA28 and DIRECT AIR HEAT XTREME PRO R-454B, in 12,000 BTU. Checked in NEEP on November 9, 2026.
See the product pageWhat the electricity costs, in dollars, winter and summer
AirGreen estimate for the same 12,000 BTU/h zone in Montréal, at Hydro-Québec’s Rate D, taxes included. Both heat pumps are calculated in exactly the same way, with the same method as on all our comparison pages; only their certified efficiencies change. Electric baseboards serve as the reference point.
How this amount is calculated
- Heat to deliver over the winter. A zone whose heat loss reaches 12,000 BTU/h ( kW) at −23.1 °C, Montréal’s design temperature: kW × 24 h × 4,167 degree-days ÷ (18 − (−23.1)) = kWh of heat for round-the-clock heating, all winter. Heating degree-days (base 18 °C) and design temperature: Natural Resources Canada, HOT2000 climate data, Montréal Intl station. With fewer hours per day (“Heating” slider), the heat is reduced in the same proportion, for the heat pump as for the baseboards: this simplification does not account for recovery after a temperature setback.
- Electricity for heating. Heat pump: heat × 3.412 ÷ HSPF2 Region V, the AHRI certificate value published by NEEP. Region V is the coldest in the standard, and its calculation includes the electric backup expected when the heat pump is no longer enough. Electric baseboards: 1 kWh of electricity for 1 kWh of heat.
- Electricity for cooling. 12,000 BTU/h ÷ SEER2 × hours per day × 60 days ÷ 1,000: the method of Hydro-Québec’s air-conditioning calculator, with the SEER2 seasonal efficiency from the AHRI certificate. The number of hours is a scenario you can set above, from 1 to 24 h. At 24 h, the calculation assumes rated capacity all day long: that is a ceiling, since a variable-speed unit slows down once the room is at temperature.
- Price. Hydro-Québec Rate D in effect April 1, 2026: 7.065¢ per kWh up to 40 kWh a day, 11.142¢ beyond; the average price, 9.104¢, is the one Hydro-Québec’s calculators use. GST and QST included. Network access charges, the same with or without a heat pump, are not counted.
AirGreen method v1.1, November 9, 2026. An estimate is used to compare units under the same conditions. The actual bill depends on the house, the insulation, the settings and the use; this amount is not a promise.
Both certificates give the same HSPF2 Region V (8.0), so winter costs the same amount in this calculation. In cooling, the SEER2 is 25.5 for the Regular and 25.4 for the MAX PERFORMANCE: the summer difference comes to a few cents. What the HSPF2 does not show is the heat available on very cold days. That is the subject of the next test.
Bring the thermometer down: how much of the heating need does each one cover?
Take the zone from our cost calculation: it loses 12,000 BTU/h when it is −23.1 °C outside, Montréal’s design temperature, and needs nothing at 18 °C. At each published temperature, the test compares that need with each unit’s maximum heating capacity.
The need follows a straight line, from 0 BTU/h at 18 °C to 12,000 BTU/h at −23.1 °C, extended below that: the same simplification as our cost calculation. A real house depends on its insulation, its windows and the wind. The share not covered must come from another heat source. Days per year: ECCC records at Montréal–Trudeau, 1991–2020, by the day’s minimum.
Below −15 °C: every published value, none invented
The Regular’s certificate publishes a point at −25 °C, its rated heating limit; the MAX PERFORMANCE’s, a point at −30 °C. BOSCH’s January 2026 technical sheets add a low-temperature heating table, which we read at an indoor temperature of 70 °F (21.1 °C).
What the BOSCH sheets list for each
BOSCH’s two January 2026 technical sheets do not describe comfort features; they list the parts supplied and the accessories offered, the same for both. Since the wall unit is the same, so are these lists.
RegularSupplied (standard part 8-733-969-088).
MAXSupplied (standard part 8-733-969-088).
BOSCH, technical sheets BTC 769208307 C and 769208308 B
RegularAccessory: BMS-WT2-XXD.
MAXAccessory: BMS-WT2-XXD.
BOSCH, technical sheets
RegularAccessory: BMS-DRY-XXD.
MAXAccessory: BMS-DRY-XXD.
BOSCH, technical sheets
RegularAccessory: BMS-PK2-7X1.
MAXAccessory: BMS-PK2-7X1.
BOSCH, technical sheets
Regular2.32 pints per hour.
MAX2.53 pints per hour.
BOSCH, technical sheets
RegularNot listed in the technical sheet consulted.
MAXNot listed in the technical sheet consulted.
BOSCH, technical sheets BTC 769208307 C and 769208308 B
The same wall unit, two sound tables
Each BOSCH sheet publishes the sound level of the BMS500-AAU012-1AHWXD wall unit at five speeds. The unit is the same, but the figures differ slightly from one sheet to the other. Here they are, as published.
How to read these figures. A lower dB(A) means a quieter unit. Each point is a published speed, from “Si” (silent) to “Turbo”.
What the sheets do not say. Neither the measurement distance nor the method is stated.
BMS500-AAU012-1AHWXD indoor unit
dB(A) per each BOSCH sheet, from lowest to highest
Method not stated in either sheet: different method — not comparable. Outdoors, each sheet gives 56 dB(A) maximum.
Same indoor wall, two outdoor units
Both pairs use the same wall unit, 31.42 in wide, and the same piping. Outside, the MAX PERFORMANCE unit is wider, deeper and heavier, according to the dimensions published by BOSCH.
Outdoor units, at the same scale
Front view and side view, from the dimensions published by BOSCH
Diagram drawn from the published dimensions, not a photo: the grille and panels are indicative.
| Installation, per BOSCH | BOSCH Climate 5000 Regular | BOSCH Climate 5000 MAX PERFORMANCE |
|---|---|---|
| Outdoor unit W × H × D, weight | 30.12 × 21.85 × 11.93 in, 62.17 lb | 31.69 × 21.81 × 12.99 in, 72.75 lb |
| Indoor unit W × H × D, weight | 31.42 × 11.85 × 9.21 in, 22.93 lb | 31.42 × 11.85 × 9.21 in, 22.93 lb |
| Liquid – gas diameters | 1/4 – 3/8 in | 1/4 – 3/8 in |
| Precharged length | 24.6 ft (7.5 m) | 24.6 ft (7.5 m) |
| Maximum piping length | 82 ft (25 m)0.16 oz of refrigerant per added foot | 82 ft (25 m)0.16 oz of refrigerant per added foot |
| Maximum height difference | 49.2 ft (15 m) | 49.2 ft (15 m) |
| Refrigerant and charge | R-454B, 32.45 oz (0.92 kg) | R-454B, 35.27 oz (1 kg) |
| Electrical protection | 208/230 V; minimum circuit ampacity 12 A, maximum fuse 15 A | 208/230 V; minimum circuit ampacity 15 A, maximum fuse 15 A |
| Indoor airflow, maximum speed | 441.4 CFMTurbo speed | 441.4 CFMTurbo speed |
| Rated heating / cooling range | −25 to 24 °C / −25 to 50 °C | −30 to 24 °C / −30 to 50 °C |
Sources: BOSCH, “Engineering Submittal Sheet” technical sheets, Climate 5000 Gen 4, 12,000 BTU wall-unit system, Regular (BTC 769208307 C) and MAX PERFORMANCE (BTC 769208308 B), January 2026, in English, consulted November 9, 2026.
What we get asked about these two BOSCH units
Why is the winter cost the same?
Because our calculation uses the certificate’s HSPF2 Region V, which is 8.0 for both. The HSPF2 sums up a whole season; it does not say how much heat each unit delivers on the coldest days.
Is it the same indoor unit?
Yes. Both AHRI certificates and both BOSCH sheets name the same wall unit, BMS500-AAU012-1AHWXD. The outdoor units differ: BMS500-AAS012-1CSXRD for the Regular, BMS500-AAS012-1CSXHD for the MAX PERFORMANCE.
What does the Regular do below −25 °C?
BOSCH rates a heating range of −25 to 24 °C for the Regular and publishes no figure below that. In Montréal, from 1991 to 2020, the day’s minimum dropped to −25 °C or lower 2.5 days a year on average.
Is the MAX PERFORMANCE sold under other names?
Three 12,000 BTU pairs have exactly the same AHRI and NEEP certified values: SENVILLE AURA R454B (AHRI 215735296), MIDEA MIDEA28 (215471381) and DIRECT AIR HEAT XTREME PRO R-454B (216571373), checked November 9, 2026.
Which one is quieter?
The sheets give 18 to 46 dB(A) for the Regular and 19.5 to 47 dB(A) for the MAX PERFORMANCE, for the same wall unit, without stating the distance or the measurement method. The documents do not allow them to be ranked.
Do they have Wi-Fi?
The technical sheets consulted do not mention it. They list a supplied remote control, a wired wall thermostat and a 24 V interface as accessories.
What about the warranty?
This page does not compare warranties. The manufacturer’s warranty documents are provided with the quote.
The AHRI certificate values, as published
| Certified value (AHRI, via NEEP) | BOSCH Climate 5000 Regular | BOSCH Climate 5000 MAX PERFORMANCE |
|---|---|---|
| Seasonal efficiency | ||
| SEER2 | 25.5 | 25.4 |
| EER2 | 13.0 | 13.4 |
| HSPF2 Region IV | 10.6 | 10.5 |
| HSPF2 Region V | 8.0 | 8.0 |
| Rated capacity at 35 °C | 12,000 BTU/h | 12,000 BTU/h |
| Heating at 8.3 °C (47 °F) | ||
| Capacity min. / rated / max. | 4,500 / 12,000 / 15,400 BTU/h | 3,800 / 12,000 / 16,000 BTU/h |
| Maximum capacity | 15,400 BTU/h | 16,000 BTU/h |
| COP min. / rated / max. | 5.73 / 3.91 / 3.50 | 4.84 / 3.74 / 3.35 |
| Heating at −8.3 °C (17 °F) | ||
| Capacity min. / rated / max. | 4,500 / 10,100 / 10,100 BTU/h | 5,300 / 12,000 / 12,800 BTU/h |
| Maximum capacity | 10,100 BTU/h | 12,800 BTU/h |
| COP min. / rated / max. | 2.40 / 2.85 / 2.85 | 2.22 / 2.51 / 1.75 |
| Heating at −15 °C (5 °F) | ||
| Capacity min. / rated / max. | 3,600 / 8,400 / 8,400 BTU/h | 4,100 / 11,500 / 11,500 BTU/h |
| Maximum capacity | 8,400 BTU/h | 11,500 BTU/h |
| COP min. / rated / max. | 1.99 / 2.30 / 2.30 | 1.72 / 1.80 / 1.80 |
| Coldest published point | ||
| Test temperature | −25 °C (−13 °F) | −30 °C (−22 °F) |
| Capacity min. and max. | 900 and 5,300 BTU/h | 2,000 and 5,900 BTU/h |
| COP min. and max. | 0.73 and 1.6 | 1.17 and 1.25 |
| Certificates | ||
| Certificate: indoor and outdoor units | BMS500-AAU012-1AHWXD and BMS500-AAS012-1CSXRD | BMS500-AAU012-1AHWXD and BMS500-AAS012-1CSXHD |
| Refrigerant | R-454BGWP 466 (IPCC, AR4); class A2L (ASHRAE 34) | R-454BGWP 466 (IPCC, AR4); class A2L (ASHRAE 34) |
| ENERGY STAR and cold climate | Yes; cold climate: yesper NEEP, Nov. 9, 2026 | Yes; cold climate: yesper NEEP, Nov. 9, 2026 |
| AHRI certificate · NEEP record | 215223298 · record 392006 | 215223282 · record 392021 |
“higher” marks the higher value of the same measure, under the same conditions. It is not a recommendation. The coldest published points are not at the same temperature: they cannot be compared with each other.
Both BOSCH units are on the AirGreen website.
A question about either one, or about the installation in your home? Talk to our team.
Documents consulted
Data checked November 9, 2026. Performance: AHRI certificates and NEEP database. Heating table below −15 °C, dimensions, sound and piping: per the manufacturer. When a source contradicts the AHRI certificate, the certificate prevails.
Trademarks. BOSCH and Climate 5000 are trademarks of their respective owners. Logos are used only to identify the products compared. AirGreen is a dealer for the brand; this page is not produced, sponsored or endorsed by the manufacturer.
Photos: AirGreen and manufacturer, for identification. Outdoor units in the Installation section: diagrams drawn from the published dimensions.
Does a figure look wrong to you? Write to us : any reported value is checked again.