Preserving the architectural elegance of a heritage home while ensuring optimal indoor comfort can be a real challenge. At AirGreen, we've helped many homeowners across Montréal, Laval, Longueuil, the North Shore, and the South Shore find a discreet air conditioning solution that’s both efficient and perfectly integrated into the classic style of their home. Choosing the right type of indoor HVAC unit is a key step to striking that subtle balance between modern performance and historic charm.
The dilemma for heritage homeowners: modern comfort without compromising aesthetics
Older homes in Montréal, often built before the 1950s, are known for their unique character: original moldings, high ceilings, detailed woodwork, stained glass, and solid hardwood floors. Installing an indoor HVAC unit in such spaces requires special attention to avoid disrupting their timeless aesthetic.
Some owners want to avoid wall-mounted systems that are too visible or exposed ducts that clash with the vintage ambiance. Others are looking for an efficient, quiet air conditioning system that is above all discreet, even invisible to the eye.
Four types of indoor units suited for heritage homes
Here are the four main categories of indoor units we regularly install in older homes, along with their benefits, limitations, and integration tips.
1. Ceiling cassette indoor unit
An almost invisible solution, ideal for large rooms with false ceilings
The cassette unit is integrated directly into the ceiling, with only a discreet square grille visible. It distributes air evenly in four directions, making it ideal for large living spaces or open-plan areas.
Advantages:
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Discreet, nearly invisible once installed
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Even airflow distribution
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Very quiet operation
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Compatible with multi-zone systems
Disadvantages:
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Requires sufficient ceiling space (drop ceiling or attic)
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Recessed installation can be complex
AirGreen example: In a century-old home in the Plateau-Mont-Royal, we installed a Daikin 18,000 BTU cassette, built into a newly created ceiling in the dining room. The result: nothing visible, absolute silence, and perfectly balanced air conditioning.
2. Low or high-wall console unit: discreet and accessible
Wall-mounted low, often under windows
The console unit resembles a modern radiator. It installs low on the wall and fits easily into underutilized areas (under a window, against an inner wall).
Advantages:
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Compact and discreet
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Perfect for rooms with low ceilings
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Can be hidden with furniture or decorative elements
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Easy to install
Disadvantages:
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Less powerful for very large spaces
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Still partially visible
AirGreen example: In a Victorian home in Westmount, we installed a Fujitsu RLS3 12,000 BTU console discreetly beneath sliding sash windows. Its sleek white design blended into the décor, maintaining the interior’s heritage look without sacrificing comfort.
3. Ducted unit: the ultimate invisible solution
Fully integrated with hidden ductwork
Ducted units are placed in attics, drop ceilings, or technical spaces. Air is distributed through small, nearly invisible vents in the walls or ceilings.
Advantages:
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Completely hidden (no visible components)
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Can serve multiple rooms with a single unit
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Even temperature control
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Adds property value
Disadvantages:
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More complex installation
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Higher labor and equipment cost
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Requires ductwork renovation
AirGreen example: In a heritage property in Old Longueuil, we designed a Goodman 24,000 BTU ducted system, with distribution via restored brass-finish grilles. A masterpiece of integration—completely hidden from guests, yet incredibly effective.
4. Floor-ceiling unit: a versatile option for complex layouts
Mounted on wall or suspended from ceiling
Floor-ceiling units can be installed low or high on the wall, or suspended from the ceiling. They offer good flexibility in the face of architectural constraints.
Advantages:
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Powerful even in difficult layouts
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Wall installation possible without ceiling work
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Neutral, unobtrusive design
Disadvantages:
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Larger visible volume than console or cassette units
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Needs strategic positioning for proper airflow
AirGreen example: In a 1930s home in Sainte-Rose (Laval), we suspended a Toshiba 18,000 BTU ceiling unit in a hallway just below a ceiling beam. Invisible from the main rooms, the unit provides comfort throughout the sleeping area.
Choosing the right unit: essential criteria
Here’s what we systematically assess at AirGreen before recommending an indoor unit:
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Home architecture (moldings, ceiling height, wall types)
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Technical constraints (no drop ceiling, load-bearing walls, attic space)
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Volume to cool and number of zones
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Desired aesthetics (maximum integration or minimalist modern look)
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Work budget and grant eligibility (e.g., Hydro-Québec’s LogisVert program)
AirGreen’s expertise in heritage homes
Our expertise is rooted in a deep understanding of Montréal’s historic architecture and surrounding areas. We frequently collaborate with heritage architects, restoration specialists, and homeowners who want to preserve their property while updating it to modern comfort standards.
Each project begins with a detailed on-site assessment. We then propose a custom HVAC solution, including the ideal model, a tailored integration design, and certified commissioning.
Why trust AirGreen?
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Specialists in discreet air conditioning for heritage buildings
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Skilled technical team trained to work with old building constraints
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Meticulous installations that respect materials and building integrity
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Full-service offering, from design to maintenance
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Over 300 installations completed in heritage homes throughout Montréal and its suburbs
Maintenance tips to ensure long-term system performance
Even the most discreet indoor units require regular HVAC maintenance:
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Clean air vents monthly
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Annual filter and condensate inspections
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Professional preventive maintenance at least once a year
A well-maintained system ensures silent operation, optimal air quality, and longer equipment life.
Conclusion: blending heritage and comfort through the right indoor unit
In Montréal and across Québec, historic buildings deserve smart, respectful solutions. Thanks to our experience in HVAC installations, we help homeowners enhance their property’s value while delivering comfort, energy efficiency, and absolute discretion.
At AirGreen, we believe every project deserves a personalized approach, and we take pride in offering premium service that meets your highest expectations.