SENVILLE ELITE Wall-Mounted Heat Pump | 18000 BTU | Montréal, Laval, South Shore

An 18,000 BTU heat pump that stands out most when the Quebec winter begins to put other appliances to the test

The SENVILLE ELITE 18,000 BTU R454B Wall-Mounted Heat Pump should not be viewed as simply a larger version of a standard residential mini-split. Its technical specifications instead show an appliance designed around three very concrete priorities: particularly high seasonal efficiency, heating capacity maintained at low temperatures, and a sufficiently broad modulation range to adapt to the load variations of a Quebec home.

For an installation in Montreal, Laval, Longueuil, Boucherville, on the South Shore, the North Shore, or elsewhere in Greater Montreal, these are precisely the features that matter to us at AirGreen.

The certified match is listed under reference AHRI 217607369, with models SENE-18EL-IHH and SENE-18EL-OH. The AHRI certificate confirms a rated cooling capacity of 18,000 BTU/h, a SEER2 of 25.6, an EER2 of 15.0, a rated heating capacity of 20,000 BTU/h, and an HSPF2 of 16.2 for Region IV.

These figures place this Senville ELITE in a category quite different from an entry-level heat pump intended primarily for summer cooling.

The essential technical figures for the 18,000 BTU SENVILLE ELITE

The official brochure describes the SENE-18EL as an 18,000 BTU wall-mounted heat pump, ENERGY STAR certified, designed for cold-climate heating and covered by a ten-year manufacturer’s warranty on the compressor.

The main features are as follows:

• Rated cooling capacity: 18,000 BTU/h
• Cooling range: 12,600 to 27,900 BTU/h
• Rated heating capacity: 20,000 BTU/h
• Heating range: 9,700 to 29,700 BTU/h
• SEER2: 25.6
• EER2: 15.0
• HSPF2-4: 16.2
• HSPF2-5: 10.0
• Rated COP: 4.40
• Minimum outdoor heating temperature: -30 °C
• Refrigerant: R454B
• Refrigerant charge: 63.45 oz
• Precharge: 25 ft
• Power supply: 208/230 V, single-phase, 60 Hz
• Minimum circuit ampacity: 24.9 A
• Maximum protection: 25 A
• Refrigerant piping: 1/4 in – 1/2 in
• Wi-Fi and Alexa: included
• Warranty: 10-year compressor / 10-year parts
• AHRI reference: 217607369

Page 4 of the brochure mainly highlights the true extent of the modulation range. In heating mode, capacity can vary from 9,700 to 29,700 BTU/h, while in cooling mode it can reach up to 27,900 BTU/h under certain conditions.

18,000 BTU on the label, up to 29,700 BTU under certain conditions

This is a point we always take the time to explain during a wall-mounted heat pump estimate.

The 18,000 BTU figure does not mean that the unit constantly operates at 18,000 BTU. The Inverter compressor adjusts its speed according to the building’s needs.

This Senville ELITE can therefore reduce its output when heating demand is low, then increase it when conditions become more demanding.

In an open-concept area in Brossard or Longueuil, for example, a heat pump may need only a fraction of its capacity on a mild October day. On a much colder January morning, the same unit can significantly increase its output.

This modulation improves several aspects of comfort:

• more consistent indoor temperature;
• fewer abrupt starts and stops;
• reduced temperature fluctuations;
• generally quieter operation at partial load;
• better adaptation to the shoulder seasons.

A properly sized unit does not need to operate at full capacity continuously to be efficient.

25.6 SEER2: very high cooling efficiency

With a SEER2 of 25.6, the SENVILLE ELITE 18,000 BTU achieves remarkable efficiency for a wall-mounted heat pump of this capacity.

The Senville brochure itself highlights the 25.6 SEER2, ENERGY STAR certification, and significant potential energy savings compared with less efficient systems.

At AirGreen, however, we avoid automatically converting SEER2 into an annual savings amount.

The actual bill depends on many factors:

• quality of the insulation;
• programmed indoor temperature;
• solar exposure;
• use of air conditioning;
• size of the space;
• replaced system;
• condition of the windows;
• air infiltration;
• occupant habits.

SEER2 remains an excellent tool for comparing equipment tested using the same methods.

EER2 of 15.0: a figure that also deserves attention

SEER2 indicates seasonal efficiency. The EER2 of 15.0, for its part, indicates cooling performance under a defined test condition.

For an 18,000 BTU unit, a high EER2 becomes relevant on hot days when the heat pump operates for long periods.

In areas such as Montreal, Laval, or the South Shore, where episodes of heat accompanied by humidity are common in summer, an efficient, properly sized heat pump can operate for long periods at a modulated output instead of constantly alternating between completely off and full capacity.

The real advantage of this ELITE: heating down to -30 °C

The brochure explicitly states a minimum operating temperature for heating of -30 °C.

This does not mean that the heat pump maintains exactly the same efficiency or capacity at all temperatures. That is precisely why performance must be examined at low-temperature points.

The data associated with the unit indicate, among other things:

• approximately 19,300 BTU/h at -8 °C;
• approximately 22,600 BTU/h at -15 °C;
• approximately 11,900 BTU/h at -30 °C.

The fact that some certified values may appear to increase between two temperatures sometimes surprises homeowners. With an Inverter heat pump, certification data correspond to specific operating points and test conditions; they do not necessarily represent a simple linear curve in which every temperature decrease automatically results in lower capacity than at the previous point.

What is particularly significant for a Quebec homeowner is the capacity of 11,900 BTU/h still specified at -30 °C.

At this temperature, many standard heat pumps are simply no longer designed to operate.

A COP still above 1 at -30 °C

COP, or coefficient of performance, helps explain how much heat the heat pump delivers compared with the electricity it consumes.

The data provided for this Senville indicate, among other things:

• COP of approximately 3.01 at -8 °C;
• COP of approximately 2.34 at -15 °C;
• COP of approximately 1.45 at -30 °C.

A COP of 1 corresponds approximately to resistive electric heating, which directly transforms electricity into heat.

A COP above 1 means that the heat pump provides more thermal energy than the electricity directly consumed by its compressor.

At -30 °C, a COP of 1.45 therefore indicates that the heat pump still retains a theoretical advantage over electric resistance heating under the relevant test conditions, even though its performance is obviously much lower than that observed in mild weather.

This is exactly the nuance we find important at AirGreen: a heat pump is not absolutely “efficient” or “inefficient.” Its performance constantly changes with the outdoor temperature and the building’s load.

Up to 20,000 BTU of nominal heating capacity for a unit sold as 18,000 BTU

The brochure lists a nominal heating capacity of 20,000 BTU/h, despite a nominal cooling capacity of 18,000 BTU/h.

This distinction is normal for certain high-performance heat pumps and particularly relevant in Quebec, where heating often accounts for a much larger share of annual use than in other markets.

For a homeowner who wants to reduce the use of electric baseboard heaters, we always look at the heating capacity rather than relying solely on the number of BTUs printed in the product's commercial name.

A heat pump for 750 to 1,000 sq. ft.?

Senville recommends this unit for approximately 750 to 1,000 sq. ft., depending on the layout.

We consider this indication a guideline, not a rule.

At AirGreen, when we assess an 850- or 900-sq.-ft. home, we specifically check:

• open or partitioned layout;
• number of windows;
• their orientation;
• insulation level;
• the floor where the space is located;
• ceiling height;
• exposed walls;
• air circulation toward adjacent rooms.

Our own installation experience in Greater Montreal also shows that a home of approximately 800 to 900 sq. ft. can often fall within a range of 12,000 to 18,000 BTU, but the correct capacity cannot be determined solely from the floor area.

A typical case in Montreal

Let’s consider an approximately 850 sq. ft. duplex floor in Montreal.

If the living room, dining room, and kitchen are largely connected, an 18,000 BTU unit installed in a central location can distribute its air effectively.

Now let’s consider the same floor area with three closed bedrooms, a narrow hallway, and a separate kitchen.

Even with a high-capacity heat pump, air cannot pass through walls.

In this second scenario, increasing the capacity even further would rarely be the solution. A different system configuration may be more appropriate.

This is a mistake we regularly encounter in the HVAC field: confusing insufficient capacity with poor air distribution.

SENVILLE ELITE installation: the details that determine its actual performance

An airflow rate of up to 812 CFM

This heat pump can move a lot of air.

The brochure states:

• 318 CFM at low speed;
• 412 CFM;
• 618 CFM;
• up to 812 CFM in Turbo mode.

The indoor sound level similarly ranges from 27 dB(A) to approximately 54.5 dB(A) in Turbo mode.

At low speed, 27 dB(A) allows for very quiet operation.

But 812 CFM represents considerable airflow for a wall-mounted unit. The evaporator's orientation then becomes essential.

If the unit blows directly toward a wall a few feet in front of it, some of its air-distribution capacity is wasted. In a large open area, we instead look for an orientation that allows the airflow to travel across the room and mix naturally with the surrounding air.

An indoor unit nearly four feet wide

The indoor module measures approximately:

46.85 in. wide × 11.02 in. deep × 13.46 in. high.

It weighs approximately 43.65 lb.

The outdoor unit measures approximately:

37.24 × 16.14 × 31.89 in.

and weighs approximately 130.29 lb.

These dimensions genuinely change the installation preparation.

In a recent condo in Laval, we may have a large, unobstructed wall available. In an older plex in Montréal, we sometimes have to work around a window, a door, trim, a load-bearing wall, or a stairwell.

We therefore check the dimensions before even bringing the unit to the worksite.

The outdoor unit requires a proper support structure

At more than 130 lb, the condenser is not a small, lightweight outdoor unit.

Its support must be suitable for the weight, vibrations, and especially Québec's winter conditions.

We must plan for:

• sufficient height above accumulated snow;
• adequate airflow;
• access for servicing;
• a location that limits vibration transmission;
• reasonable protection from water and ice coming from a roof;
• compliance with applicable municipal requirements and clearance specifications.

In Longueuil, Boucherville, Laval, or Montréal, the outdoor location is often just as important as the indoor location.

1/4 in.–1/2 in. piping: what to watch for during a replacement

The unit uses a combination of 1/4 in. and 1/2 in. refrigerant piping.

When a homeowner replaces an old heat pump, we never automatically confirm that the existing piping can be retained.

We check in particular:

1. the actual diameters;
2. the length;
3. the condition of the copper;
4. the condition of the insulation;
5. compatibility with the new equipment;
6. the absence of contamination;
7. the route through the building.

Reusing a poor line set simply because it is already concealed in a wall can cancel out all the benefits of a high-efficiency heat pump.

R454B and 25-foot precharge

The Senville ELITE uses R454B refrigerant and contains a specified charge of 63.45 oz. The system is precharged for a piping length of up to 25 ft.

The brochure also specifies that with a 50-foot line set, additional refrigerant must be added on site by the installer.

R454B belongs to the A2L refrigerant category. The Senville manual specifically provides for a leak-detection system on the affected units and explains that, if a leak is detected, the compressor stops and the indoor fan is activated according to a safety sequence.

For us, this reinforces the importance of a professional HVAC installation, using tools and procedures suited to the refrigerant being used.

208/230 V, MCA of 24.9 A, and maximum protection of 25 A

The system operates on 208/230 V single-phase, 60 Hz.

The technical specifications state:

• MCA: 24.9 A;
• maximum protection: 25 A;
• power supply range: 187 to 253 V;
• specified interconnection cable: 14/4 AWG.

We use these values to plan the project, but the electrical installation must always be validated based on the panel and the building’s actual conditions.

A high-efficiency heat pump installed on an inadequate circuit remains a poor installation.

Wi-Fi, Alexa, and integrated diagnostics

Smart control is one of the model’s useful features.

The brochure mentions compatibility with Alexa, app control, the ability to set schedules, and the option to change settings remotely.

It also mentions self-diagnostic and leak-detection features.

In a primary residence, Wi-Fi makes daily management easier. In a cottage, rental unit, or intermittently occupied property, remote control becomes even more relevant.

LogisVert: why the $2,316 amount corresponds precisely to this model

The heating capacity indicated at -8°C is 19,300 BTU/h.

Hydro-Québec currently offers, when all program conditions are met, $120 per 1,000 BTU/h at -8°C for a cold-climate ENERGY STAR-certified heat pump.

The calculation for this Senville is therefore:

19.3 × $120 = $2,316

This is the $2,316 LogisVert grant amount displayed for this model.

The unit is ENERGY STAR certified and presented as a cold-climate heat pump. AHRI certification 217607369 is active and concerns the exact pairing targeted here.

For owners of multi-unit residential buildings meeting Hydro-Québec’s specific criteria, a bonus of $100 per 1,000 BTU/h at -8 °C can bring the total assistance to $220 per 1,000 BTU/h, for installations eligible since June 15, 2026.

At 19,300 BTU/h, this would theoretically represent:

19.3 × $220 = $4,246

This bonus is not automatic. The building must meet the specific conditions of the multi-unit residential program.

At AirGreen, we always verify the criteria applicable to the address and installation date rather than assuming a subsidy is available solely because the model is eligible.

A 10-year warranty on the compressor and parts

The Senville brochure indicates a warranty of:

10 years on the compressor and 10 years on the parts.

It also specifies that professional installation is required to maintain warranty coverage.

The AirGreen information sheet therefore presents the configuration as 10-10-0 years, with the option of additional protection.

As always, the exact registration and warranty conditions stated in the final quotation must be kept with the invoice and serial numbers.

The classic problem we want to avoid: buying an ELITE and installing it like an ordinary heat pump

A heat pump with 25.6 SEER2, a high HSPF2, and heating capacity at -30 °C may lose some of its appeal if several details are overlooked.

In our profession, we encounter errors such as:

• indoor unit positioned solely to shorten the piping;
• condenser too close to the ground;
• poorly insulated pipes;
• drainage line without adequate slope;
• electrical circuit selected without checking the nameplate data;
• unit oversized for the room;
• old copper reused without validation;
• condenser installed beneath a roof drainage outlet;
• service access almost impossible after the work.

Product quality does not make up for these errors.

Maintenance that preserves performance

The owner can directly contribute to the proper operation of their system.

We particularly recommend:

• clean the filters regularly;
• keep the outdoor unit clear of leaves and snow;
• do not block the indoor airflow with furniture;
• monitor the drain discharge;
• have the unit inspected if its capacity decreases;
• plan for a deep cleaning of the wall-mounted heat pump when the indoor heat exchanger is dirty.

With a unit capable of moving up to 812 CFM, keeping the heat exchanger and filters clean is especially important. Reduced airflow can affect comfort, energy consumption, and the unit’s operation.

Which homeowners do we primarily recommend the 18,000 BTU SENVILLE ELITE to?

This heat pump becomes particularly appealing when the homeowner is looking to combine:

• winter heating down to -30 °C;
• high cooling efficiency;
• high capacity without immediately moving up to a 24,000 BTU model;
• quiet operation at low speed;
• ENERGY STAR cold-climate certification;
• Wi-Fi control;
• R454B refrigerant;
• long-term warranty;
• attractive LogisVert rebate;
• heating capable of continuing well beyond the range of a standard mini-split.

For someone whose only priority is affordable summer cooling, some simpler product lines may be sufficient.

For someone who wants to use their heat pump as a true tool for reducing electric heating during Quebec winters, the ELITE becomes much more relevant.

Why choose AirGreen for this installation?

At AirGreen, our job is to match the heat pump to the building, not simply sell a number of BTUs.

For an 18,000 BTU SENVILLE ELITE in Montreal, Laval, Longueuil, on the South Shore, or the North Shore, we check the heating load, airflow, indoor location, outdoor support, piping, refrigerant-circuit length, drainage, and electrical supply before commissioning.

Our installation process in Greater Montreal is based in part on an assessment of the floor area, room layout, insulation, windows, and the actual volume to be heated and cooled.

This is particularly important with a high-performance model like this: we want the features customers pay for on paper to genuinely translate into comfort and savings in their home.

Request an AirGreen quote for your 18,000 BTU SENVILLE ELITE

For a SENVILLE ELITE 18,000 BTU R454B wall-mounted heat pump installation in Montreal, Laval, Longueuil, on the South Shore, North Shore, or in Montérégie, contact AirGreen.

We can verify the sizing, location, electrical installation, piping, the $2,316 LogisVert rebate applicable under the current conditions, and the various warranty options for your project.