A raised installation designed to withstand snow without cluttering the property
On this brick residence in Vaudreuil-Dorion, the location of the outdoor unit was a decisive part of the project. A wall-mounted heat pump can offer excellent performance on paper, but its actual performance, lifespan, and noise level depend largely on the quality of its installation. Here, we installed a Hitachi airHome 800 on sturdy wall brackets, at a height that protects the unit from snow accumulation, splashes, leaves, and debris.
The jobsite photo shows a façade with several constraints: brick masonry, closely spaced windows, a metal overhang beneath the unit, limited ground-level space, and considerable working height. We therefore had to find a location that would ensure all of the following simultaneously:
- adequate airflow around the condenser;
- sufficient clearance for future servicing;
- protection against winter accumulation;
- a secure fastening adapted to the masonry;
- an orderly routing of the refrigerant lines and wiring;
- a visually cohesive integration with the façade.
This approach is particularly relevant in Vaudreuil-Dorion, where an outdoor heat pump installed too close to the ground can quickly become surrounded by compacted snow after a storm or after a snowblower passes.
Why did we choose a wall-mounted installation on brackets?
A ground pad is not always the best solution. Depending on a home's layout, it can encroach on a yard, driveway, side passage, or an area already used for storage. It can also place the condenser too close to snowbanks.
In this project, mounting on wall brackets made it possible to completely free up the space below. The unit remains accessible while being positioned above the main snow accumulation risks. The metal brackets were installed to properly distribute the weight of the unit and maintain an appropriate distance between the wall and the condenser.
This distance is essential. The outdoor unit must be able to draw in and discharge air without obstruction. A condenser pressed against a façade, enclosed beneath a structure, or surrounded by objects may lose efficiency and undergo more frequent defrost cycles.
A masonry attachment that requires careful planning
Brick must never be treated as a simple decorative surface. A wall-mounted installation requires choosing fasteners compatible with the building’s actual substrate, as well as carefully checking the condition of the masonry.
Before drilling, we assess in particular:
- the condition of the bricks and mortar joints;
- the thickness and composition of the wall;
- the position of the windows and architectural elements;
- the weight of the outdoor unit;
- vibrations that may be transmitted to the structure;
- accessibility of the connections for HVAC maintenance.
We also seek to avoid locations where vibrations could be more noticeable in a bedroom or near a resting area. Anti-vibration components and proper tightening help limit noise transmission through the building.
Working at height without compromising technical access
The installation visible in the photo is clearly above ground level. This configuration requires adapted work methods, controlled equipment handling, and precise preparation before lifting the unit.
Once the heat pump is in place, enough space must remain to:
- remove the service panels;
- access the refrigeration valves;
- take pressure and temperature measurements;
- inspect the electrical connections;
- clean the outdoor coil;
- work on the fan or internal components.
A unit installed very high up but too close to an obstacle or a corner of the building can become difficult and costly to maintain. We therefore incorporate future accessibility into the design of every HVAC installation.
A position that also protects the façade
The unit was installed above a metal overhang located beneath the window. We had to prevent water from defrosting from falling into a problem area or accumulating against the building.
In heating mode, a heat pump extracts heat from the outdoor air. Frost naturally forms on the coil, after which the unit periodically initiates a defrost cycle. The resulting water must be able to drain freely.
Proper placement reduces the following risks:
- ice formation on a walkway;
- water accumulation near the foundation;
- accelerated corrosion of certain surfaces;
- blockage underneath the unit;
- refreezing around the base pan;
- water infiltration into a vulnerable area of the building envelope.
In Montreal, Laval, Longueuil, on the North Shore, the South Shore, and in Vaudreuil-Soulanges, this water management is just as important as the refrigerant connection itself.
Lines installed with particular attention to detail
A wall-mounted heat pump includes several connections between the indoor unit and the outdoor condenser:
- a liquid line;
- a refrigerant gas line;
- an interconnection cable;
- a power supply;
- a condensate drain for the indoor unit.
Refrigerant lines must be properly sized for the specific model. They are insulated to limit heat loss and prevent condensation. Flared connections must be prepared carefully, tightened to the proper torque, and checked before commissioning.
We then pressurize the system and perform a vacuum procedure in accordance with the applicable requirements. Evacuation is not a mere formality: it removes air and moisture from the circuit. An installation started with residual moisture may eventually experience performance issues, oil acidity, or premature compressor wear.
The Technical Shortcuts We Refuse to Take
To preserve the equipment's performance, we avoid several errors that are still far too common:
- selecting the pipes solely based on the existing lines;
- ignoring the maximum permitted lengths;
- neglecting the vacuum procedure;
- leaving insulation exposed to the elements;
- installing the condenser too close to the wall;
- directing defrost water toward an entrance;
- selecting the capacity based solely on the floor area;
- starting the unit without checking for leaks.
Within the airHome 800 lineup, connection diameters vary depending on capacity. Higher-capacity models do not necessarily use the same lines as 9,000- or 12,000-BTU units. The model number must therefore be verified before reusing any existing piping.
Why the Hitachi airHome 800 is a good fit for homes in Vaudreuil-Dorion
The Hitachi airHome 800 is a wall-mounted heat pump with Inverter technology designed for cooling, heating, and indoor air treatment. The lineup includes models with rated cooling capacities ranging from 9,500 to 22,000 BTU/h, with rated heating capacities ranging from 12,000 to 25,400 BTU/h.
The exact capacity must always be determined through a calculation that takes the building into account. Floor area alone is not enough. We also consider:
- the number of floors;
- insulation;
- windows;
- solar orientation;
- room layout;
- ceilings;
- air infiltration;
- the existing heating system;
- the desired temperature;
- the unit's actual capacity at low temperatures.
According to the manufacturer's documentation, the airHome 800 range can operate in heating mode down to −30 °C and retain up to 100% of its heating capacity at −20 °C, depending on the model. It uses R32 refrigerant, includes a Wi-Fi interface for the airCloud Go app, and offers efficiency ratings of up to 26.5 TRÈS2. The smaller models can operate as quietly as 30 dB(A) in indoor silent mode.
A heat pump suited to rapid temperature changes
In the Vaudreuil-Dorion area, the same week can include overnight freezing temperatures, a mild day, humidity, and significant temperature swings. Inverter technology allows the compressor to modulate its speed instead of operating only at full capacity.
This modulation offers several advantages:
- more stable indoor temperature;
- fewer on-off cycles;
- energy consumption better suited to actual needs;
- generally quieter operation;
- better management of shoulder seasons;
- more gradual heating on cold days.
Proper sizing remains essential, however. An oversized unit is not automatically an improvement. In cooling mode, it may reach the requested temperature too quickly without removing enough humidity. An undersized unit, on the other hand, may run continuously without achieving the desired comfort.
Cleaning functions that complement regular maintenance
The airHome 800 incorporates several technologies designed to limit the accumulation of contaminants inside the unit.
FrostWash 3.0
The FrostWash 3.0 function cools the heat exchanger to trap some of the dust and impurities in a layer of ice. The melting process then carries the residue toward the drain.
This function helps keep the coil cleaner, but it does not replace professional maintenance. The fan, condensate pan, drain, filters, and internal surfaces must still be inspected and cleaned periodically.
Mold Guard 2.0
The Mold Guard 2.0 function monitors internal conditions that may promote moisture buildup. When certain conditions are met, the system heats the indoor coil to dry it.
This function is useful in homes that are frequently air-conditioned during humid periods. It reduces the time that certain internal surfaces remain wet after an air-conditioning cycle.
Filtration and Air Quality
The unit includes a PM2.5 activated carbon filter and a stainless steel prefilter. Filtration helps trap certain particles and reduce certain odors, but a wall-mounted heat pump does not replace a complete ventilation system or central filtration system.
To maintain good air quality, we also recommend:
- to clean the prefilters regularly;
- to maintain reasonable indoor humidity;
- to check the operation of the air exchanger;
- to have the condensate drain inspected;
- to schedule thorough cleaning when deposits are visible.
The airCloud Go Wi-Fi control
The Wi-Fi interface is designed to be discreetly installed inside the unit. The airCloud Go app allows you to change settings remotely, create schedules, and view certain operating information.
Available features include:
- a weekly timer;
- remote temperature management;
- integration with certain voice assistants;
- consumption estimates;
- the display of certain error codes;
- the activation of compatible maintenance functions;
- the location-based Smart-Fence function.
Connected control is particularly practical for a residence that is occupied irregularly or when homeowners want to adjust the temperature before their arrival.
Outdoor protection designed for Quebec’s climate
Hitachi documentation indicates that the outdoor units are equipped with a durable metal cabinet and an anti-corrosion coating applied to the condenser. These features are useful in an environment exposed to rain, snow, freezing temperatures, and repeated defrost cycles.
However, the unit must not be installed beneath a gutter downspout or in an area directly exposed to large amounts of water or ice. A snow protection accessory may also be considered in particularly exposed locations, provided that it complies with the ventilation clearances.
Maintenance required after installation
Even a heat pump equipped with self-cleaning functions requires regular HVAC maintenance.
To maintain reliable operation, we recommend:
- to wash the filters according to how the unit is used;
- to keep the front and top of the indoor unit unobstructed;
- to remove leaves from around the condenser;
- to keep the air intakes and outlets clear;
- not to break the ice with metal objects;
- to monitor unusual noises or vibrations;
- to have the unit inspected when its performance decreases;
- to schedule a thorough cleaning based on the environment.
A residence located near a dusty road, mature trees, a construction site or a significant source of pollen may require more frequent maintenance.
Financial incentives must be verified before signing
Some Hitachi heat pump models may qualify for financial assistance programs. However, eligibility does not depend solely on the airHome 800 trade name.
You must verify the exact pairing of the indoor and outdoor units, the AHRI number, capacity at the required temperature, building type, heating source and the rules in effect at the time of the application.
We recommend keeping:
- the detailed quote;
- the final invoice;
- model and serial numbers;
- proof of payment;
- installation photographs;
- the warranty registration documents;
- the applicable AHRI reference.
A potential subsidy amount should never be promised before the file has been fully validated.
The result of this Vaudreuil-Dorion installation
This installation demonstrates that a complex location can be transformed into a durable solution with proper planning. The heat pump is mounted high up, frees up floor space and remains protected from some of the winter accumulation. Its positioning respects the facade’s architecture while allowing the condenser to breathe.
For us, a successful installation involves much more than mounting a unit and turning it on. It must take into account the building, climate, access, water drainage, vibrations, electrical safety and actual heating needs.
This rigor guides our wall-mounted heat pump projects in Vaudreuil-Dorion, as well as our HVAC installations in Montreal, Laval, Longueuil, the North Shore and the South Shore.