A raised outdoor unit precisely integrated into a restricted space
This Samsung WindFree™ MaxHeat wall-mounted heat pump installation carried out by our AirGreen team in Rosemont–La Petite-Patrie illustrates a frequent reality in Montreal's central neighborhoods: the space available for the outdoor unit is often limited by the building's architecture, windows, adjacent walls, and traffic areas.
At this site, we had to place the outdoor unit in a narrow section directly beneath a window, between a brick wall and an exterior stucco finish. An improvised ground-level installation would have exposed the unit to water, debris, and winter accumulation, while leaving less space for drainage. We therefore designed an installation on a raised metal support that was stable and adapted to the actual dimensions of the location.
The photograph shows several important details of our work:
- the Samsung outdoor unit is raised above the slab;
- the support rests on four feet equipped with base plates;
- anti-vibration isolators are placed beneath the unit's support points;
- the fan remains completely unobstructed toward the front;
- the refrigerant lines enter discreetly from the right side;
- the outdoor unit is centered on its support beam;
- access to the service panel remains possible;
- water can flow beneath the unit without remaining trapped against its base.
This compact configuration allowed us to maintain an orderly installation without sacrificing the essential elements for performance: airflow, stability, drainage, accessibility, and vibration reduction.
Why a Samsung WindFree™ MaxHeat heat pump was suitable for this residence
For this project in Rosemont–La Petite-Patrie, we installed a 12,000 BTU Samsung WindFree™ MaxHeat. This capacity is often suitable for a living area, an open floor, or a well-defined portion of a dwelling, but it should never be selected solely according to an approximate rule based on square footage.
Before recommending a unit, we assess in particular:
- the actual area served;
- the layout of the rooms;
- the quality of the insulation;
- the age of the doors and windows;
- sun exposure;
- ceiling height;
- air infiltration;
- the possible location of the indoor unit;
- natural air circulation;
- winter heating needs;
- the presence of electric baseboard heaters or another supplementary system.
In Rosemont–La Petite-Patrie buildings, configurations vary considerably. Some homes occupy an entire floor of a duplex or triplex, while others include several small rooms connected by a corridor. A wall-mounted heat pump can be highly effective, but its perceived performance also depends on the air's ability to circulate toward adjacent areas.
The Samsung WindFree™ MaxHeat series is designed to provide cooling in summer and low-temperature heating. For the commonly offered 12,000 BTU combination, performance can reach approximately 24 SEER2, with heating capacity maintained in very cold outdoor temperatures and operation possible down to approximately -30 °C, depending on the exact combination of indoor and outdoor units.
The AHRI reference associated with the combination must always be verified before purchase and before submitting any request for financial assistance. For certain 12,000 BTU Samsung WindFree™ MaxHeat combinations, the known reference is AHRI 215399291. Nevertheless, we confirm the exact numbers shown on the nameplates when preparing the customer's application.
WindFree™ technology: reducing the sensation of drafts
The WindFree™ function is one of the most popular features of this Samsung range.
A conventional wall-mounted heat pump projects air through a louver located beneath the indoor unit. This mode remains useful when a room needs to be cooled quickly. Once the desired temperature is reached, WindFree™ mode can then distribute air through numerous micro-openings on the front of the unit.
The result is gentler air distribution, which is particularly useful when the indoor unit is located:
- near a sofa;
- facing a table;
- in a bedroom;
- near a workstation;
- in a room where occupants are sensitive to drafts;
- in a living area used for long periods.
This technology does not replace proper placement. Even with WindFree™ mode, the indoor unit must be installed in a location that promotes air circulation and allows access to the filters.
An inverter system adapted to the home's changing needs
The Samsung WindFree™ MaxHeat uses an inverter technology compressor. Instead of constantly operating at full power and then stopping completely, the system adjusts its output according to the room temperature.
When the difference between the ambient temperature and the setpoint is significant, the heat pump increases its output. As the temperature stabilizes, it reduces its power to maintain comfort with fewer fluctuations.
This modulation helps:
- limit short cycling;
- reduce temperature fluctuations;
- improve acoustic comfort;
- support more stable energy consumption;
- provide greater efficiency at partial load;
- maintain the requested temperature more consistently.
For this modulation to be truly beneficial, the sizing must be consistent with the building’s needs. An oversized unit may reach its setpoint too quickly, while an undersized unit may operate continuously during the coldest or hottest days.
Choosing a metal support instead of a direct ground-level installation
The support visible in the photograph is not merely an aesthetic accessory. It is an important part of this HVAC installation in Montreal.
The outdoor unit produces water when it runs its defrost cycles in heating mode. This water must be able to fall and drain away without forming a large mass of ice directly beneath the unit’s base.
A ground-level installation would have reduced the clearance beneath the heat pump. It would also have exposed the coil and the cabinet base to more dirt, splashes, and buildup.
The raised structure offers several advantages:
- it keeps the unit away from accumulated water;
- it facilitates drainage during defrost cycles;
- it reduces exposure to debris;
- it simplifies inspection beneath the unit;
- it improves access for certain maintenance work;
- it helps protect the outdoor unit during the winter;
- it limits the risk of obstruction around the base.
We adjusted the support height according to the space beneath the window. The unit had to be high enough for drainage, without obstructing the opening or coming too close to the window’s lower sill.
Visible vibration isolators beneath the unit
We installed vibration isolators between the Samsung unit’s feet and the metal crossbeam.
These small components help reduce mechanical transmission between the compressor, the outdoor cabinet, and the supporting structure. This precaution is particularly relevant in a dense area such as Rosemont–La Petite-Patrie, where the units may be located near bedrooms, neighboring dwellings, or surfaces capable of transmitting vibration.
However, vibration isolation depends on the installation as a whole. We also check:
- that the structure is completely stable;
- that the bolts are properly tightened;
- that the unit is level;
- that the lines do not make rigid contact with a surface;
- that no loose metal part can vibrate;
- that the ground anchors do not allow movement;
- that the support is sized for the weight of the unit.
A modern heat pump can be quiet, but an improperly stabilized installation can turn a slight vibration into a noticeable resonance inside the building.
A layout between the brick, stucco, and window
The available location required careful measurements. The outdoor unit is positioned between two distinct surfaces: a brick wall on the left and a stucco wall on the right, with a window directly above.
We had to maintain sufficient space for:
- the intake of air through the heat exchanger;
- the discharge of air by the fan;
- the possible removal of the service panel;
- access to the refrigerant connections;
- the coil cleaning;
- the electrical inspection;
- the circulation of defrost water.
The fan is directed toward an open area. This is essential. An outdoor unit must not blow directly against a fence, privacy screen, cabinet, or wall placed too close.
When the discharged air immediately returns toward the coil, recirculation can occur. In summer, the unit then draws in air that has already been heated. In winter, it may draw in colder air produced by its own heat exchange. In both cases, performance may decrease.
A refrigerant finish grouped near the building
On the right side of the unit, the refrigerant lines are grouped near the wall. This arrangement reduces their exposure and maintains a tidy appearance.
A quality installation includes several elements that are less visible than the unit itself:
- the properly sized copper lines;
- the continuous refrigerant insulation;
- the communication cable;
- the compliant electrical supply;
- the protection of the wall passage;
- the sealing against water and air;
- the fastening of the lines;
- the indoor unit’s drainage.
We make sure that the lines do not put strain on the outdoor unit’s valves. Constant mechanical tension can weaken the fittings and promote leaks over time.
The leak test before commissioning
Once the connections are complete, we check the circuit for leaks. Flared fittings must be prepared properly and tightened to the appropriate torque.
Insufficient tightening can cause a leak. Excessive tightening can damage the flare or weaken the copper. The precision of this step directly affects the heat pump’s reliability.
Evacuating the refrigeration circuit
Before releasing the refrigerant into the lines, we evacuate the system to remove air and moisture.
Moisture left in a refrigeration circuit can cause:
- oil contamination;
- an undesirable chemical reaction;
- unstable pressures;
- a loss of efficiency;
- premature compressor wear;
- intermittent problems that are difficult to diagnose.
This operation is not visible in the final photograph, but it is one of the most important steps in a wall-mounted heat pump installation.
The presence of the A2L label on the outdoor unit
An A2L safety label is visible on the heat pump cabinet. It indicates that the equipment uses a refrigerant classified as mildly flammable under the applicable standards.
This technological development entails specific requirements for transport, installation, handling, and servicing. Technicians must use methods and tools suited to the refrigerant concerned, follow the manufacturer’s procedures, and avoid any ignition source when working on the circuit.
For the owner, this classification does not mean that the unit is dangerous when installed correctly. Rather, it means that installation and maintenance must be entrusted to a qualified team that understands the specific requirements of A2L refrigerants.
The technical decisions that make this installation durable
Plan for the Montreal winter from the day of installation
A heat pump installed in Rosemont–La Petite-Patrie must operate under very different conditions throughout the year: summer heat, humidity, rain, freezing temperatures, snow, and rapid temperature fluctuations.
In heating mode, the outdoor coil becomes cold and may accumulate frost. The system then starts a defrost cycle. The ice melts and produces water beneath the unit.
The height of the support helps maintain clear space beneath the cabinet. However, the owner should avoid accumulating the following there:
- boxes;
- seasonal furniture;
- bags;
- tools;
- a cover;
- absorbent materials;
- objects that could block the water.
It is normal to see water or steam during a defrost cycle. However, an accumulation of ice reaching the base of the outdoor unit should be monitored.
Keep the front of the fan clear
The large fan visible in the photograph must have clear space around it. Do not place an enclosed decorative structure in front of the unit, even to conceal it.
A screen may be suitable in some configurations, but it must comply with the manufacturer’s clearance requirements and allow unobstructed air discharge. A purely aesthetic decision can quickly impair performance and increase noise.
Clean the coil without damaging the fins
The outdoor coil can accumulate:
- pollen;
- dust;
- leaves;
- fibers;
- urban debris;
- residue from trees;
- dirt carried by rain.
A clogged coil reduces heat transfer. However, cleaning with a high-pressure jet can bend the aluminum fins and cause more damage than good.
During HVAC maintenance, we use methods suited to the level of dirt buildup and the construction of the unit.
Maintain access to the service panel
The unit was positioned so that its service side remains accessible. This decision facilitates:
- connection checks;
- electrical measurements;
- compressor diagnostics;
- inspection of electronic control boards;
- sensor testing;
- leak detection;
- future repairs.
A heat pump squeezed too tightly between two walls may function properly at first, but make every service call longer and more expensive. We therefore incorporate technical access into the initial planning.
Use the heat pump as the primary source, with the baseboard heaters as backup
In many Montreal homes, electric baseboard heaters remain in place after a wall-mounted heat pump is installed.
To promote energy savings, we generally recommend setting the heat pump to the desired comfort temperature, then setting the baseboard thermostats a few degrees lower.
For example:
- heat pump set to 21°C;
- baseboard heaters set to 18 or 19°C;
- interior doors left open whenever possible;
- a stable temperature rather than frequent changes.
This strategy allows the heat pump to provide most of the heating, while the baseboard heaters come on when certain remote areas become cooler.
Eligibility for financial assistance: verify both model numbers
A Samsung WindFree™ MaxHeat may qualify for financial assistance under a program such as LogisVert, but eligibility must be confirmed based on the exact combination installed.
You must verify:
- the indoor unit model;
- the outdoor unit model;
- the AHRI reference;
- the applicable ENERGY STAR® certification;
- the recognized heating capacity at low temperatures;
- the purchase date;
- the installation date;
- the type of building;
- the current program criteria.
The name WindFree™ MaxHeat alone does not guarantee a subsidy. Two visually similar units may have different technical references and different eligible amounts.
At AirGreen, we record the relevant information in the project documentation so that the homeowner can prepare their application using accurate data.
The mistakes we avoided on this project
In such a compact location, several mistakes could have compromised the result:
- place the unit directly on the slab;
- install a support that is too wide for the available space;
- partially obstruct the fan;
- place the cabinet against the window;
- forget access to the service panel;
- leave the lines unsupported;
- secure the unit without anti-vibration isolators;
- neglect defrost water;
- install an unstable structure;
- select the capacity without assessing the home;
- promise a subsidy without verifying the models;
- use improper methods with an A2L refrigerant.
Our role is to anticipate these problems before the unit is started, rather than correct them after the first season of use.
An AirGreen installation adapted to Rosemont–La Petite-Patrie
The result is a Samsung outdoor unit neatly integrated into a limited space, with a structure proportionate to the building and placement that facilitates maintenance.
The elevated support protects the unit from ground-level accumulation. Anti-vibration isolators limit mechanical transmission. The fan remains unobstructed, the lines are grouped near the wall, and technical access is maintained.
This installation allows the homeowner to benefit from:
- of a 12,000 BTU wall-mounted heat pump suited to cold climates;
- of modulating heating;
- of efficient air conditioning;
- of the comfort of WindFree™ technology;
- of a securely supported outdoor unit;
- of a space better protected against water and ice;
- of an installation designed for long-term service.
At AirGreen, we install wall-mounted heat pumps in Rosemont–La Petite-Patrie, throughout Montreal, as well as in Laval, Longueuil, the North Shore, and the South Shore. Each project is assessed based on its architecture, access constraints, window placement, available clearances, drainage, and the occupants’ actual needs.
A good HVAC installation depends on more than just the brand chosen. It relies on a series of consistent technical decisions, from sizing to the outdoor support, including refrigerant connections, evacuation, vibration management, and commissioning.