Home / Comparisons / 12,000 BTU wall heat pumps
MIDEA28 and MIDEA35: what changes from one series to the other
Two MIDEA 12,000 BTU wall units using R-454B, ENERGY STAR cold climate certified and offered by AirGreen. Same manufacturer, same brochure, same refrigerant: this page lines up every certified difference between the two series, and what the MIDEA35 changes in size and weight.
MIDEA28 12,000 BTU
MSEHU-H12B-2A / MO1HS-H12B-2A · AHRI 215471381
See the product pageSame NEEP values: SENVILLE AURA R454B, DIRECT AIR HEAT XTREME PRO R-454B, BOSCH MAX PERFORMANCE R-454B.
MIDEA35 12,000 BTU
MSESU-H12B-2A / MO1SS-H12B-2A · AHRI 215471387
See the product pageSame NEEP values: SENVILLE ELITE (AHRI 217607368).
What electricity costs, in dollars, winter and summer
AirGreen estimate for the same 12,000 BTU/h zone in Montréal, at Hydro-Québec 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.
How this amount is calculated
- Heat to supply 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 heating around the clock, all winter. Heating degree-days (base 18 °C) and design temperature: Natural Resources Canada, HOT2000 climate data, Montréal Intl station. With fewer hours a 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 the recovery after a temperature setback.
- Electricity for heating. Heat pump: heat × 3.412 ÷ Region V HSPF2, 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 seasonal SEER2 efficiency from the AHRI certificate. The number of hours is a scenario, adjustable above from 1 to 24 h. At 24 h, the calculation assumes rated capacity all day long: this is a maximum, since a variable-speed unit slows down once the room reaches the right temperature.
- Price. Hydro-Québec Rate D in force on 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. The system access charge, the same with or without a heat pump, is 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.
What the MIDEA35 changes compared with the MIDEA28
On the left, both indoor units on the same wall, to the scale of their published dimensions. On the right, every certified or published difference, MIDEA35 minus MIDEA28. The arrows go up or down with the figure, with no judgment: a higher value is not always the one you want.
Wall 48 in wide. Dimensions W × H × D according to MIDEA (2025-08-20): 31.30 × 11.61 × 8.86 in and 37.99 × 12.56 × 9.41 in. Photos: AirGreen product cards, scaled to the published width.
Difference MIDEA35 − MIDEA28
Below −15 °C: 2,000 BTU/h more for the MIDEA35, then 1,600 at −30 °C
NEEP certifies both series at −15 °C and at −30 °C: these two rows compare directly. MIDEA publishes no capacity between −15 and −30 °C for these models; the table then gives the range between the two certified points on either side of the temperature.
One brochure, one feature table
The MIDEA Canada wall-mounted systems brochure (2025-08-20) presents the features of the MIDEA35, 28 and 25 series in a single table, without telling them apart. What this page can state: both series share the list below, according to MIDEA. The differences between them are in the figures, above.
MIDEA28 and MIDEA35: Wi-Fi and SmartHome app, optional voice control; optional 7-day programmable wired control; optional 24 V interface; dry contact.
MIDEA28 and MIDEA35: fan speed adjustable from 1 to 100%; horizontal and vertical swing; “Follow Me”.
MIDEA28 and MIDEA35: humidity sensor, dual control of temperature and humidity. Dehumidification capacity not published.
MIDEA28 and MIDEA35: automatic cleaning; removable blower wheel for deep cleaning.
MIDEA28 and MIDEA35: A2L leak detection sensor and A2L dispersion system.
MIDEA28 and MIDEA35: ECO and “Gear”, Turbo, sleep mode, silent mode, 8 °C heating, smart presence sensor.
A feature missing from a brochure is not necessarily missing from the unit: the document simply does not mention it. Each unit’s user guide, provided with the quote, is more complete.
Same manufacturer, same method: speed by speed
Both series are measured by MIDEA and published in the same table, with the same speed names. They can therefore be read speed by speed. MIDEA publishes no “Turbo” value for the MIDEA35, nor the measurement distance.
How to read these figures. dB(A) measures a noise level as the ear perceives it: the lower the figure, the quieter the unit. Each dot is a fan speed published by MIDEA, from the slowest to the fastest.
What can be compared, and what cannot. At the “Silent”, “Low” and “Medium” speeds, the two series are within half a point or one point of each other. At “High”, 36.5 and 41.5 dB(A), for published airflows of 323.7 and 423.8 CFM. The “Turbo” level of the MIDEA35 is not published.
Indoor unit, in the room
All published speeds
Outdoor unit, outside
“High” speed
Measurements published by MIDEA in a single table, with no measurement distance: read them speed by speed, not as a ranking.
Source: MIDEA Canada brochure of 2025-08-20, p. 10 (MIDEA35) and p. 11 (MIDEA28), “sound level” and “indoor airflow”.
The same piping, a larger outdoor unit
Units to scale
Same scale for both photos. The MIDEA35 outdoor unit is also larger: 35.04 × 26.50 × 13.46 in and 99.65 lb, versus 31.69 × 21.81 × 12.99 in and 72.75 lb.
| Installation | MIDEA28 | MIDEA35 |
|---|---|---|
| Maximum piping length | 82 ft | 82 ft |
| Precharged length | 24.6 ft | 24.6 ft |
| Additional charge beyond the precharged length | 0.16 oz/ft | 0.16 oz/ft |
| Maximum height difference | 49.2 ft | 49.2 ft |
| Liquid – gas diameters | 1/4 – 3/8 in | 1/4 – 3/8 in |
| Outdoor unit W × H × D, weight | 31.69 × 21.81 × 12.99 in, 72.75 lb | 35.04 × 26.50 × 13.46 in, 99.65 lb |
| Indoor unit W × H × D, weight | 31.30 × 11.61 × 8.86 in, 22.93 lb | 37.99 × 12.56 × 9.41 in, 28.22 lb |
| Electrical protectionAccording to the manufacturer | Max. fuse 15 A (MCA 15 A) | Max. fuse 20 A (MCA 16 A) |
| Dehumidification | Not published by the manufacturer. | Not published by the manufacturer. |
| Refrigerant and factory charge | R-454B, 35.27 oz | R-454B, 44.09 oz |
| Stated heating / cooling range | −30 to 24 °C / −30 to 50 °C | −30 to 24 °C / −30 to 50 °C |
Outdoor unit clearances: MIDEA service manual for single-zone outdoor units (figures SC-1 and SC-2, common to all capacities); the installer measures them on site. The higher electrical protection of the MIDEA35 is checked against the existing panel at the time of the quote.
What people ask about these two series
What is different about the MIDEA35, in figures?
According to the AHRI certificates: SEER2 29.4 versus 25.4, HSPF2 12.7 and 9.5 versus 10.5 and 8.0, and more maximum capacity at 8.3, −8.3, −15 and −30 °C. According to MIDEA: an indoor unit 6.69 in wider and an outdoor unit 26.9 lb heavier.
Are there points where the MIDEA28 has the higher value?
Yes. The COP at full capacity at 8.3 °C (3.35 versus 3.17), the certified rated capacity at −8.3 °C (12,000 versus 11,000 BTU/h) and the rated COPs at 8.3 °C (3.74 versus 3.59) and at −8.3 °C (2.51 versus 2.41). Rated points are settings chosen by the manufacturer for the test.
My room has a narrow wall: is there a difference?
Yes: 31.30 in wide for the MIDEA28, 37.99 in for the MIDEA35, not counting the required side clearances. The overlaid wall, above, shows the difference to scale.
The MIDEA35 brochure says HSPF2 14.5: why does this page say 12.7?
The MIDEA brochure of 2025-08-20 prints 14.5 and 10.0; AHRI certificate 215471387, as listed by NEEP and ENERGY STAR, gives 12.7 and 9.5. When sources disagree, this page follows the certificate.
Do they have other names?
At 12,000 BTU, the SENVILLE ELITE carries the same NEEP certified values as the MIDEA35; the SENVILLE AURA R454B, the DIRECT AIR HEAT XTREME PRO R-454B and the BOSCH MAX PERFORMANCE R-454B, the same as the MIDEA28.
Which one is quieter?
At the “Silent”, “Low” and “Medium” speeds, MIDEA publishes values within one point of each other for both. At “High”, 36.5 dB(A) for the MIDEA28 and 41.5 for the MIDEA35, which also moves more air at that speed.
Are they eligible for grants?
Eligibility depends on the official list in force on the date of purchase. This page promises no amount; the current list is checked at the time of the quote.
AHRI certificates 215471381 and 215471387, line by line
| Certified value | MIDEA28 | MIDEA35 |
|---|---|---|
| Cooling | ||
| Rated capacity at 35 °C | 12,000 BTU/h | 12,000 BTU/h |
| SEER2 | 25.4 | 29.4 |
| EER2 | 13.4 | 14.2 |
| Heating, same conditions | ||
| HSPF2 Region IV | 10.5 | 12.7 |
| HSPF2 Region V | 8.0 | 9.5 |
| 8.3 °C: min. / rated / max.BTU/h | 3,800 / 12,000 / 16,000 | 4,000 / 12,000 / 17,200 |
| 8.3 °C: COP min. / rated / max. | 4.84 / 3.74 / 3.35 | 5.86 / 3.59 / 3.17 |
| −8.3 °C: min. / rated / max.BTU/h | 5,300 / 12,000 / 12,800 | 1,600 / 11,000 / 14,600 |
| −8.3 °C: COP min. / rated / max. | 2.22 / 2.51 / 1.75 | 1.88 / 2.41 / 2.26 |
| −15 °C: min. / rated / max.BTU/h | 4,100 / 11,500 / 11,500 | 900 / 13,500 / 13,500 |
| −15 °C: COP min. / rated / max. | 1.72 / 1.80 / 1.80 | 1.15 / 2.00 / 2.00 |
| −30 °C (−22 °F): same temperature for both | ||
| −30 °C: capacity min. / max.BTU/h | 2,000 / 5,900 | 4,100 / 7,500 |
| −30 °C: COP min. / max. | 1.17 / 1.25 | 1.14 / 1.29 |
| Listings and refrigerant | ||
| ENERGY STAR / cold climate (NEEP) | Yes / Yes | Yes / Yes |
| AHRI certificate · NEEP record | 215471381 · 387358 | 215471387 · 387352 |
| RefrigerantGWP according to the IPCC (AR4); ASHRAE 34 class | R-454B · GWP 466 · A2L | R-454B · GWP 466 · A2L |
higher marks the higher value of the same measure, under the same conditions. It is not a recommendation. Capacities and COPs by point are not highlighted: the order changes depending on the point read.
The MIDEA28 and the MIDEA35 are both on the AirGreen website.
To choose between the MIDEA28 and the MIDEA35, talk to our team: bring the room dimensions, the width of the planned wall, the planned outdoor location and your current heating.
Where the MIDEA28 and MIDEA35 figures come from
Data verified November 9, 2026. Performance: AHRI certificates and the NEEP database. Dimensions, sound, piping and features: according to the manufacturer. When a source contradicts the AHRI certificate, the certificate prevails.
Trademarks. MIDEA, MIDEA28 and MIDEA35 are trademarks of their owner. 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.
Does a figure look wrong to you? Write to us: every reported figure is checked again.