Discreet and efficient summer comfort, perfectly integrated into a Montreal apartment
At AirGreen , we design each HVAC installation to integrate with the lifestyle and architecture of Greater Montreal's housing. In this project in Côte-des-Neiges–Notre-Dame-de-Grâce , we are replacing an aging unit with a Danby through-the-wall air conditioner ( PTAC/through-the-wall family), chosen to provide reliable and quiet air conditioning in a bright living room with hardwood floors, an electric baseboard heater at the bottom of the wall, and a large side window.
Why choose a through-the-wall air conditioner (PTAC) in this context?
The through-the-wall air conditioner meets several requirements typical of Montreal apartments and condominiums:
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Compact and aesthetic footprint : the unit fits into a wall sleeve and a finishing frame ; no external condenser on the ground or on the balcony.
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Localized performance : ideal for efficiently air conditioning a large living room or bedroom, without complex refrigeration work.
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Reduced noise : vibrations are dampened by the sleeve and seals; the outer face directs airflow and noise to the outside.
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Easy maintenance : front access to the washable filter; easy cleaning of the coils during HVAC maintenance visits.
The Danby brand: practicality, availability and service
Danby is a well-known brand for through-the-wall air conditioners, which come in a variety of capacities (typically 8,000 to 14,000 BTU ). Key points that make us recommend them for this type of home:
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Precise electronic controls , timer and multiple fan speeds.
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Dry and Auto modes useful during humid inter-seasons.
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Electrical safety with plug incorporating a reset device.
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Parts and service available in the metropolitan area, which speeds up interventions.
Detailed description of the installation
Our team proceeds in stages to guarantee a clean, lasting and safe result.
1) Preparation of the wall and the sleeve
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Checking the existing wall sleeve : rigidity, peripheral sealing and outward slope (approximately 6–8 mm) to promote gravity flow of condensates.
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Re-sealing of the seals around the interior frame to eliminate any air gaps that could create hot infiltrations in summer or cold infiltrations in winter.
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Installation of a rigid finishing frame , flush with the painted wall for a clean finish around the appliance.
2) Electrical configuration
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Check the dedicated circuit (15 A or 20 A depending on the appliance's power) and the polarity of the socket. No extension cord should be used; the cable must go directly to the approved socket.
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Check the clearance of existing electric baseboards to prevent any overheating or recirculation of hot air towards the air conditioner inlet.
3) Setting up the Danby unit
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Sliding the device into the sleeve until it locks; installing anti-vibration pads to limit the transmission of structural noise.
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Alignment of the front panel to the frame; checking the firmness of the slats and the insufflation grid.
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Functional test: start in Cool mode, temperature differential control, verification of condensate flow and ventilation speeds.
4) Finishing and site cleanliness
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Straightening and discreet channeling of the power cable for a clean passage along the wall.
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Advice to the owner on the use of net curtains and blinds : leave the front grille clear and avoid any obstacles within 30 cm.
Constraints encountered and solutions provided
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Proximity to an electric baseboard : we have validated the minimum clearances and oriented the insufflation to prevent cold air from “recirculating” immediately towards the device.
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Wall adjacent to a large window : in order to avoid direct solar gain which distorts the temperature reading, we positioned the probe away from the rays and set the median speed during the day for stable regulation.
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Internal sealing : a small gap around the edge of the frame has been sealed to eliminate thermal bridges and prevent odors or dust from entering from the outside.
Sizing and comfort obtained
For a 20-30 m² living space in a well-maintained apartment, the typical capacity is between 9,000 and 12,000 BTU . The Danby selected comfortably covers these needs, with:
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Rapid cooling in the early afternoon when the solar energy is strong on the bay window;
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Effective dehumidification in Dry mode during humid episodes;
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Pleasantly contained interior noise level thanks to Low speed in the evening.
Good operating practices
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Leave at least 20–30 cm free in front of the grille to ensure even air distribution .
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Avoid extension cords or multiple sockets: the compressor requires a starting current; a dedicated socket is essential.
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In the event of a storm, activate the plug protection (“reset/test” button) if a power outage occurs.
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Keep the adjacent window closed during use; any entry of hot air deteriorates performance and increases consumption.
Maintenance recommended by AirGreen
Simple and regular HVAC maintenance maximizes the longevity of this type of device:
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Monthly filter cleaning during the warm season.
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Gently dust the evaporator battery (interior) and visual inspection of the condenser battery (exterior side) through the facade.
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Annual check of the slope of the sleeve and the condensate drainage hole .
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Checking the electronic controls (keyboard and remote control), the temperature sensor , and the silent blocks .
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At the end of the season, install an exterior winter hood compatible with the facade to prevent the infiltration of cold air and dust.
What to avoid
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Obstruct the exterior facade (bins, canvases, decorations): the machine must breathe freely.
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Block the condensation gutter : condensation water must drain outside; stagnation creates odors and can freeze in spring/autumn.
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Install above a heat source (radiator in operation) without sufficient clearance: this disrupts thermoregulation and the compressor works unnecessarily.
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Forget about sealing : small gaps around the frame result in significant energy losses and a feeling of draft.
Subsidies and alternatives
PTAC through-the-wall air conditioners are generally not eligible for grant programs focused on electrification and heating efficiency. If a customer is interested in financial assistance , we offer certified wall-mounted heat pumps (mini-splits) or central heat pumps , capable of heating efficiently down to -25°C/-30°C . In this case, our team performs a thermal analysis and compares the investment, annual consumption and maintenance to recommend the most cost-effective solution.
Security and Compliance
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Appliance plugged into an approved outlet corresponding to the required amperage, with an appropriate circuit breaker on the panel.
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Cabling runs neatly along the wall; no cables cross unprotected passageways.
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Respect the clearances around the exterior facade in accordance with the manufacturer's recommendations.
A careful project, a lasting result
The Danby unit installed in Côte-des-Neiges–Notre-Dame-de-Grâce now offers consistent summer comfort , without requiring any floor or balcony space, and with a sleek aesthetic thanks to the interior frame. The quality of the installation —controlled slope sleeve, resealed seals, secure power supply—guarantees long-lasting performance and simplified maintenance.
For co-owners and building managers in Greater Montreal who want to quickly modernize their homes without major renovations, the PTAC/through-the-wall solution remains a very relevant option. And when annual savings and grant objectives come into play, our team guides you toward the appropriate heat pump (wall-mounted, multi-zone, or central), always with a professionally installed HVAC system .
Our AirGreen support
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On-site assessment : BTU sizing, thermal load, noise and architectural constraints.
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Appliance selection : Danby or other brands available depending on capacity, voltage and required exterior facade.
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Turnkey installation : sleeve, joints, finishes, testing and commissioning.
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Preventive maintenance : scheduled visits at the start/end of the season to maintain the performance and cleanliness of the coils.
Do you want to replace an old wall-mounted unit, improve the comfort of a main room, or compare it with a wall-mounted heat pump ? We operate in Montreal, Laval, Longueuil, on the North Shore and the South Shore , with solutions adapted to the reality of each building.