Installation of an ELIOS EMC wall-mounted heat pump in Napierville

A discreet installation designed to distribute air efficiently throughout the room

In Napierville, we installed an wall-mounted ELIOS EMC heat pump in a residential room where visual integration mattered just as much as heating and cooling performance. The result shown in the photo clearly illustrates our approach: an indoor unit mounted high on the wall, perfectly level, clear of obstacles, and discreetly integrated into a white wall.

The selected location allows the treated air to move freely throughout the room without being blocked by the furniture below. The unit is also installed at an appropriate distance from the ceiling and decorative molding, leaving enough space for air intake through the top of the unit and making access easier during future HVAC maintenance.

This project demonstrates that a successful wall-mounted heat pump installation is not simply a matter of mounting a unit on the wall. Every detail affects comfort: the height, the airflow direction, the routing of the refrigerant lines, condensate drainage, clearance around the unit, and the machine’s ability to meet the building’s actual needs.

Why the indoor unit’s location was crucial

In this room, part of the wall is occupied by a relatively tall storage unit. We therefore had to choose a position that would avoid several common problems:

• an air stream directly blocked by the furniture;
• poor circulation of heat toward the center of the room;
• a unit installed too close to the ceiling;
• difficult access to the filters;
• an unbalanced visual result;
• an uncomfortable air draft toward the occupants.

We placed the ELIOS unit in a clear section of the wall, far enough away from the furniture. This configuration promotes more even distribution of warm or cool air. It also allows the motorized louvers to direct the air into the room rather than against an obstacle.

The top of the unit remains unobstructed, which is particularly important since the indoor unit generally draws ambient air in from above before passing it through its filters and coil.

Clean integration into a bright residential setting

The white casing of the ELIOS EMC wall-mounted heat pump naturally blends with the room’s wall and ceiling. The unit remains visible, as with any ductless unit, but its positioning reduces its visual impact.

No piping, electrical wires, or drainage lines are visible on the photographed interior section. This clean finish indicates that the technical route was planned to preserve the appearance of the room.

At AirGreen, we pay particular attention to these details, especially when working in an already finished home. A clean installation often requires more preparation: precise selection of the drilling location, verification of the outdoor route, anticipation of the drain slope, and protection of surfaces during the work.

The ELIOS EMC wall-mounted heat pump: designed for the Quebec climate

The ELIOS EMC series is available in several nominal cooling capacities: 9,000, 12,000, 18,000, 24,000 and 33,000 BTU/h. The exact capacity of the installed unit cannot be confirmed from the photo alone; it must be verified using the model number or nameplate.

According to the manufacturer’s technical documentation, all EMC series sizes use R454B refrigerant and are certified ENERGY STAR V6.1 for cold climates. The range is designed to operate in heating mode down to an outdoor temperature of -30 °C.

This point is particularly relevant in Napierville and on the South Shore, where winter temperatures can drop quickly. A heat pump designed for cold climates must be able to continue providing useful heat when the building’s demand increases.

Heat+ technology and maintaining heating capacity

The EMC series incorporates Heat+ technology, developed to increase heating capacity as the outdoor temperature drops. The brochure states that these units can provide up to 100% of their rated heating capacity at -15 °C, while remaining capable of operating down to -30 °C.

However, this feature does not replace professional sizing. A high-performance heat pump can provide disappointing results if it is too small, too large, or improperly positioned.

When evaluating a project, we consider, among other things:

• the actual area served;
• the number of floors;
• the age and insulation of the building;
• the number and orientation of the windows;
• ceiling height;
• sun exposure;
• the layout of the rooms;
• air infiltration;
• the presence of supplemental heating.

At equal capacity, two homes in Napierville may have very different heating and cooling needs. That is why we avoid selecting a heat pump solely based on the number of square feet.

An Inverter compressor for more stable operation

The ELIOS EMC heat pump is equipped with an Inverter compressor. Unlike a conventional appliance that operates primarily through complete on and off cycles, an Inverter system can gradually adjust its output.

The EMC series documentation mentions compressor frequency control in increments of 1 %. This modulation allows the unit to adapt better to the room’s immediate needs.

In practice, this helps to:

• limit sudden temperature fluctuations;
• reduce repeated starts;
• maintain a more consistent comfort level;
• improve performance at partial load;
• reduce noise when demand is low;
• reduce the sensation of an intense draft.

When the indoor temperature approaches the setpoint, the unit can reduce its output rather than shutting off immediately. This makes operation more consistent, particularly during the transitional periods of spring and fall.

Variable performance depending on the selected capacity

Energy performance varies according to the series format. The documentation lists the following values for cooling:

• 9,000 BTU: up to 26 TRÉS2;
• 12,000 BTU: up to 24 TRÉS2;
• 18,000 BTU: 21.7 TRÉS2;
• 24,000 BTU: 22.3 TRÉS2;
• 33,000 BTU: 20 TRÉS2.

In heating mode, the 9,000 BTU model achieves a 10.1 CPSC2 rating in Region V, while the other capacities deliver results suited to different load levels and residential configurations.

These values show why it is important to compare systems with equivalent capacity. High performance on paper should always be analyzed according to the actual need, the design temperature, and the building layout.

Quiet indoor operation

The noise level of a wall-mounted unit is particularly important when the appliance is installed in a living room, bedroom, office, or frequently occupied living area.

Depending on capacity, the ELIOS EMC indoor unit can reach approximately 20 to 23 dB(A) at low silent speed. The compact 9,000 and 12,000 BTU models reach approximately 20.5 and 20 dB(A), respectively, in this setting.

The series also offers a “Do Not Disturb” mode, which disables the display and sound alerts during the night. This feature can be useful when the unit is located near a sleeping area.

Two-stage filtration and active cleaning

The ELIOS EMC uses a two-stage filtration system. The first helps capture dust, pollen, and pet hair. The second includes a carbon element designed to absorb certain odors, smoke, and certain contaminants in the air.

The unit also has an active cleaning function designed to reduce the accumulation of contaminants on the indoor coil.

However, these functions do not make the unit maintenance-free. The filters must be removed and cleaned regularly. A clogged filter can reduce airflow, increase noise, decrease performance, and encourage dirt buildup on the coil.

For a home occupied daily, we generally recommend checking the filters every month during periods of heavy use. The frequency should be increased in the presence of pets, construction work, heavy dust, or smoke.

Heated pan and outdoor defrost management

In winter, the outdoor unit extracts heat from the surrounding air. Moisture can then turn into frost on the coil. The heat pump periodically performs a defrost cycle to remove this buildup.

The ELIOS EMC series is equipped with a heated condensate pan, which helps prevent ice from accumulating in the base of the outdoor unit.

For this protection to remain effective, the outdoor installation must also follow certain rules:

• the unit must be sufficiently elevated above the ground;
• snow must not block the air intake or outlet;
• water produced during defrosting must be able to drain;
• the support must be solid and stable;
• vibrations must not be unnecessarily transmitted to the building;
• access for maintenance must be preserved.

A machine designed to operate down to -30 °C must still be installed with snow, ice, wind, and winter drainage in mind.

The technical steps that ensure installation reliability

Wall inspection and support preparation

Before installing the indoor unit, we must verify that the wall surface can support the mounting plate securely. The plate must be perfectly level to ensure proper drainage and a professional appearance.

A unit that is slightly tilted or improperly secured can cause vibrations, noise, poor condensate drainage, or movement of the casing.

We also check the location of studs, electrical wires, plumbing, and other hidden elements in the wall before drilling.

Refrigerant line routing

Piping dimensions vary according to system capacity. The brochure specifies, among other things:

• 9,000 and 12,000 BTU: 1/4 in. liquid and 3/8 in. gas;
• 18,000 BTU: 1/4 in. liquid and 1/2 in. gas;
• 24,000 BTU: 3/8 in. liquid and 5/8 in. gas;
• 33,000 BTU: 3/8 in. liquid and 3/4 in. gas.

Using the correct diameter is essential. An incorrect line can hinder oil return, increase pressure losses, and compromise compressor operation.

The flared connections must be prepared carefully, tightened to the appropriate torque, and checked for any leaks. The circuit is then evacuated to remove air and moisture before the service valves are opened.

Condensate drainage

In cooling and dehumidification mode, the indoor unit removes moisture from the air. This water must drain through a drainage line installed with a continuous slope.

An improper slope can cause:

• gurgling noises;
• standing water;
• odors;
• overflow;
• marks on the wall;
• a leak beneath the unit.

On this installation in Napierville, the clean interior finish and absence of exposed ductwork demonstrate the importance given to the routing of the drainage and technical lines.

Proper electrical supply

Electrical requirements depend on the selected capacity. The specification sheet indicates a maximum outdoor fuse rating of:

• 15 A for the 9,000 and 12,000 BTU models;
• 20 A for the 18,000 BTU model;
• 25 A for the 24,000 BTU model;
• 35 A for the 33,000 BTU model.

The unit nameplate remains the final reference for selecting the circuit breaker, wiring, and disconnect switch. The power supply must be installed in accordance with applicable electrical requirements and the manufacturer's instructions.

Commissioning and operation check

After installation, we do more than simply power on the unit. A complete commissioning includes, among other things:

1. checking the connections;
2. confirming drainage;
3. checking the power supply;
4. testing in cooling mode;
5. testing in heating mode;
6. observing the fan and louvers;
7. checking for noises or vibrations;
8. explaining the remote control to the customer;
9. presenting the maintenance instructions.

The EMC series offers several useful features, including turbo mode, freeze protection at 8 °C, automatic restart after a power outage, local temperature sensing, and optional compatibility with a 24 V interface for a third-party thermostat.

Common mistakes to avoid with a wall-mounted heat pump

Several issues observed during service calls stem less from the quality of the unit than from its selection or installation.

Choosing solely based on floor area

Square footage is a starting point, but it does not replace a thermal load analysis. An oversized unit may quickly reach the requested temperature without operating long enough to dehumidify properly. An undersized unit may run continuously without maintaining comfort during the coldest periods.

Installing the unit too close to the ceiling

Insufficient clearance above the unit limits air intake and makes maintenance more difficult. In the photo of this installation in Napierville, the unit is installed beneath the moulding while still maintaining an unobstructed space.

Directing air toward a piece of furniture

A tall piece of furniture placed in front of the air outlet can redirect air toward the ceiling or cause it to return quickly to the unit. The system then reaches its setpoint without properly treating the entire room.

Neglecting filter cleaning

Even a new heat pump will quickly lose efficiency if its filters remain clogged. Regular cleaning is one of the simplest ways to maintain airflow.

Blocking the outdoor unit with snow

A cold-climate heat pump cannot operate properly if its coil is buried in snow or if the air outlet is blocked. Sufficient clearance must be maintained throughout the winter.

A solution adapted to homes in Napierville and the South Shore

This ELIOS EMC wall-mounted heat pump installation in Napierville meets a specific goal: providing a high-performance, discreet four-season unit that is properly integrated into the indoor environment.

The EMC series combines several features suited to Quebec’s climate: operation down to -30 °C, Inverter technology, a heated base pan, ENERGY STAR certification for cold climates, R454B refrigerant, quiet modes, and two-stage filtration.

However, final quality depends on the project as a whole. Capacity selection, positioning, piping, drainage, electrical work, outdoor support, and commissioning must be treated as one system.

At AirGreen, we install wall-mounted heat pumps in Montreal, Laval, Longueuil, the North Shore, and the South Shore, adapting each project to the building’s actual configuration. This installation in Napierville illustrates our priority: achieving a clean result that is accessible for maintenance and capable of distributing air efficiently throughout the space being served.