Installation of a Samsung WindFree™ MaxHeat wall-mounted heat pump in the City of Laval

A heat pump integrated into a narrow corner, above a glazed opening

This Samsung WindFree™ MaxHeat wall-mounted heat pump installation in Laval stands out because of its particularly challenging indoor location. The unit was positioned in the upper section of a wall, directly above a glazed opening and immediately beside a corner of the room. The ceiling, perpendicular wall, framing beneath the unit, and curtain rod considerably reduced the room for manoeuvre.

In such a configuration, a few centimetres can completely change the feasibility of the project. It is not enough for the casing to physically fit in the available space. We must also preserve air intake, allow the louver to move fully, plan the route for the lines, ensure condensate drainage, and maintain reasonable access for future service.

The photograph taken beneath the unit clearly shows the complexity of this installation. The side of the indoor unit remains visible, along with its technical labels and service panel, while the lower section is installed just above the framing. This perspective visually emphasizes the proximity of the surfaces. On site, however, we rely on actual measurements and the manufacturer's requirements rather than an impression created by the camera angle.

The result makes it possible to cool and heat the room without taking up a large interior wall, blocking the opening below, or placing a unit in a traffic area.

Why this location required in-depth analysis

Completely unobstructed walls are rare in many homes in Laval. Windows, patio doors, curtains, cabinets, furniture, and decorative elements often limit the installation options for a wall-mounted air conditioner or heat pump.

In this room, the upper section of the opening was the most logical location, but several constraints had to be resolved simultaneously:

• a short distance between the ceiling and the framing;
• the proximity of a perpendicular wall;
• the presence of a rod and curtain;
• limited access to the side of the unit;
• the need to direct the air toward the living area;
• a drainage route to plan before drilling;
• a mounting surface capable of supporting the unit without vibration.

We therefore studied the position of the wall plate, the direction in which the connections exit, and the clearance required around the housing before beginning the installation.

This preparation avoids having to move the unit after drilling, a correction that could leave unnecessary openings in the wall, complicate the finishing work, or require a less attractive piping route.

The importance of the side wall in air circulation

A unit installed near a corner must be oriented so that it does not unnecessarily direct its air against the adjacent wall. The lower louver must be able to direct the airflow toward the depth of the room.

We specifically check that:

1. the louver can open fully;
2. the side wall does not block a significant portion of the airflow;
3. the discharged air does not immediately return to the intake;
4. the curtains do not move in front of the unit;
5. the room temperature can be measured without excessive influence from the glazing.

Poor positioning can create a very cold or very hot area near the unit, while the opposite end of the room remains uncomfortable. A high-performance heat pump cannot fully compensate for poorly planned air distribution.

For this installation in Laval, we used the available height to give the airflow useful reach while keeping the unit away from the traffic area.

Preserving technical access despite limited space

The side panel visible in the photograph highlights an aspect that is often overlooked: a wall-mounted heat pump must remain serviceable.

During its service life, a technician may need access to various components:

• the electronic control board;
• the sensors;
• the fan motor;
• the condensate pan;
• the electrical connections;
• the refrigerant connections;
• the louver mechanism;
• the filters and heat exchanger.

A very compact installation should not turn every service visit into a complex disassembly. Before securing the unit, we therefore assess how its front panel can be opened and how it can be detached from its mounting plate if necessary.

The photograph also shows the identification labels on the side of the housing. This information is important for warranty registration, ordering parts, and identifying the installed combination.

Why we keep the model numbers in the file

The exterior appearance does not make it possible to determine a heat pump’s capacity with certainty. Several capacities in the same series may use nearly identical housings.

To avoid any confusion, we document:

• the indoor unit model number;
• the outdoor unit model number;
• the serial numbers;
• the installation date;
• the AHRI or ENERGY STAR® certification number, when applicable;
• the information required for the warranty;
• photographs of the nameplates.

The exact BTU capacity cannot be read in the photograph provided. We therefore do not infer it from the cabinet width. The current Samsung WindFree™ MaxHeat range includes different capacities, including 9,000, 12,000, 15,000, 18,000, and 24,000 BTU. Performance and efficiency ratings vary depending on the indoor-outdoor combination selected.

Samsung WindFree™ MaxHeat: distribution designed to reduce cold drafts

The microperforated front panel is the most distinctive visual and functional feature of the WindFree™ series.

When a rapid temperature reduction is needed, the unit can first use its main louver to distribute a more direct airflow. Once the room is close to the setpoint, WindFree™ mode diffuses air through the microperforations in the front panel to achieve gentler circulation.

Samsung states that in WindFree™ mode, the air velocity is below 0.15 m/s, a level associated with the concept of “still air” according to the ASHRAE reference used by the manufacturer. This function is intended to limit the sensation of a concentrated cold draft on occupants.

This technology is particularly relevant in a room where positioning options are limited. A unit installed above a window or near a corner may be relatively close to an occupied area. WindFree™ distribution can then maintain comfort without continuously directing an air jet in the same direction.

A holding function, not a correction for a poor location

WindFree™ mode does not replace a proper airflow assessment. It does not correct:

• an air intake blocked by the ceiling;
• a curtain covering the front panel;
• a louver directed toward a wall;
• an improperly sized capacity;
• a sensor influenced by a heat source;
• a unit installed in an area without communication with the rest of the room.

We therefore always begin by selecting the best possible location. The unit’s advanced features then help improve the comfort achieved.

A heat pump suited to Quebec’s low temperatures

The Samsung WindFree™ MaxHeat series is designed for cold climates. Samsung advertises low-temperature heating output, with operation and heating capacity available down to approximately −30 °C, depending on the capacity and certified combination. The current lineup is offered with several residential capacities and efficiencies of up to approximately 24.5 SEER2, depending on the model.

However, three specifications must be distinguished:

Nominal capacity

This is the capacity generally used to designate the model, for example 12,000 or 18,000 BTU.

Capacity available in very cold weather

Actual heating capacity varies with the outdoor temperature. A heat pump does not necessarily provide the same capacity at −25 °C as it does at a milder temperature.

The minimum operating temperature

The fact that a unit can continue operating down to a very low temperature does not mean it can heat just any residence on its own under all conditions.

We therefore take into account the building’s heat losses and existing supplementary heating. Electric baseboards or another backup heat source may remain necessary during periods of extreme cold, depending on the area served, insulation, and installed capacity.

Sizing a room with a large opening

The presence of a window or glass door beneath the unit directly affects the heat load.

In summer, the sun can quickly raise the indoor temperature. In winter, the glazing can become a source of heat loss and create a cold-wall sensation.

To choose the appropriate capacity, we consider in particular:

• room dimensions;
• ceiling height;
• window orientation;
• glazing quality;
• sun exposure;
• wall and ceiling insulation;
• air infiltration around the frames;
• the opening toward adjacent rooms;
• the number of occupants;
• heat-producing appliances.

An oversized heat pump can reach its cooling setpoint very quickly. It may then run shorter cycles and spend less time dehumidifying.

An undersized unit may run continuously without managing to maintain comfort during the most demanding days.

At AirGreen, we therefore do not choose capacity solely from a chart showing an approximate number of square feet per BTU range.

Routing the lines through a wall corner

The location near the corner also required precise planning of the connections.

A wall-mounted installation generally requires:

• two insulated refrigerant lines;
• one electrical and communication cable;
• a condensate drain;
• a sealed wall opening;
• protection for the outdoor lines;
• a power supply that complies with the unit’s specifications.

The route must avoid bends that are too tight. A crushed or deformed refrigeration line can reduce refrigerant circulation and impair system operation.

The pipe insulation must remain continuous. An unprotected section of cold line can produce condensation inside the wall, behind a line cover, or near the frame.

A hole that must take the opening below into account

Above a window or door, the wall may contain a lintel, reinforced framing elements, electrical wires, or previous modifications.

We therefore inspect the structure before drilling. The goal is to find a route that:

• does not compromise the opening support;
• allows for an adequate drainage slope;
• protects the lines;
• limits visible finishing;
• remains accessible in case of service.

Particularly important drainage above a frame

During cooling and dehumidification, water forms on the indoor coil. This water must be collected in the condensate pan and then discharged through the drain.

When the unit is installed above an opening, a drainage problem could damage:

• the top of the frame;
• the trim;
• the wall;
• the curtains;
• the finish around the window;
• the floor below.

We therefore pay particular attention to the pipe slope. A gravity drain must remain sloped downward, with no hidden rise or compressed section.

We also perform a drainage test before completing the work. This check confirms that water flows properly through the drain and that no connection is leaking.

Vacuuming before opening the circuit

After the lines are installed, they still contain air and moisture. These must be removed before the service valves are opened.

Vacuuming removes unwanted elements from the circuit. An incomplete operation can contribute to:

• abnormal operating pressures;
• reduced efficiency;
• contamination of the refrigeration oil;
• premature compressor wear;
• problems appearing several months after installation.

We also check the tightness of the connections before commissioning. An installation is not complete simply because the unit starts and produces cold air.

The tests carried out after installation

Our commissioning includes several checks:

1. cooling startup;
2. heating startup;
3. operation of the lower flap;
4. verification of WindFree™ mode;
5. remote control response;
6. communication between the units;
7. condensate drainage;
8. absence of abnormal vibration;
9. wall plate stability;
10. outdoor unit operation.

We also explain to the homeowner how to adjust the airflow direction, clean the filters, and choose a stable setpoint.

Maintenance, mistakes to avoid, and financial assistance for this installation in Laval

The curtain must remain away from the unit

The photograph shows a curtain rod and curtain near the heat pump. This situation is common when the unit is installed above an opening.

The fabric must not rise in front of the air intake or touch the louver. A poorly positioned curtain can:

• reduce airflow;
• draw dust toward the filters;
• interfere with temperature readings;
• deflect air toward the ceiling;
• come into contact with moving parts;
• produce a rubbing noise.

We recommend keeping the curtain to the side while the unit is operating.

Filter cleaning and thorough maintenance

Washable filters should be inspected periodically. A frequently used exterior opening can increase the entry of dust, pollen, and particles.

The homeowner can generally clean the basic filters, but professional HVAC maintenance may become necessary when contaminants accumulate on:

• the heat exchanger;
• the blower wheel;
• the condensate pan;
• the drain;
• the louvers;
• the interior surfaces of the casing.

A clean filter does not guarantee that the blower wheel is also clean. Buildup on the blades can reduce airflow, cause an imbalance, and produce odors.

The main mistakes to avoid in a tight corner

Install the unit simply because the casing fits

You must also plan for air intake, discharge, removal, and maintenance.

Infer the capacity from the appliance size

The nameplate and AHRI combination are the only reliable references.

Neglect the service side

An unplanned unit installed flush against a wall may become difficult to repair.

Let the curtain cover the front of the unit

WindFree™ mode cannot distribute air properly if the microperforations are blocked.

Drill without checking the structure

The area above an opening may contain a lintel and various concealed elements.

Omit the condensate test

An improper slope may remain unnoticed until indoor humidity increases.

Set the louver the same way in summer and winter

In cooling mode, the air can be directed more horizontally. In heating mode, directing it downward helps distribute heat throughout the occupied area.

LogisVert eligibility to be verified using the exact combination

A Samsung WindFree™ MaxHeat may be eligible for the LogisVert program when the specific combination of the indoor and outdoor units meets the current criteria.

For installations completed since November 26, 2025, Hydro-Québec requires, among other things, ENERGY STAR® certification for a heat pump to be eligible. The regular incentive is calculated based on the recognized heating capacity at −8 °C: $50 per 1,000 BTU/h for an eligible ENERGY STAR® heat pump, or $120 per 1,000 BTU/h when it is certified for cold climates.

The amount must not be calculated solely from the nominal capacity listed in the commercial name. The AHRI number or the number recognized by Hydro-Québec’s official tool must be used. The application must currently be submitted within nine months of the installation date.

For certain eligible multi-unit residential buildings, the incentive can reach $220 per 1,000 BTU/h at −8 °C for a cold-climate wall-mounted heat pump. Additional building criteria apply, including its construction date, number of units and location in a targeted area.

Without the complete outdoor unit number and the certified combination, we cannot announce a precise amount for the unit shown in the photograph. This verification prevents presenting the owner with an estimate based on the wrong model.

A compact installation designed to last

This installation in the City of Laval demonstrates that a difficult location can be used effectively when it is assessed before the work begins.

We had to coordinate:

• the proximity of the ceiling;
• the side wall;
• the opening below the unit;
• the curtain rod;
• the routing of the lines;
• drainage;
• access to the components;
• airflow direction.

Choosing the Samsung WindFree™ MaxHeat combines cooling, low-temperature heating and gentle air distribution. Installing it high up frees the other walls and makes use of an area of the room that would otherwise have been underused.

At AirGreen, we carry out this type of HVAC installation in Laval, as well as in Montreal, Longueuil, the North Shore and the South Shore, adapting each project to the building’s actual structure. Our goal is to deliver a heat pump that is properly positioned, correctly connected, accessible for maintenance and capable of distributing air throughout the area that is actually occupied.