Why a Ducted System Can Be a Great Asset or a Headache Depending on Your Choices
At AirGreen, we install ducted HVAC systems throughout the Montréal, Laval, Longueuil, North Shore and South Shore regions. This type of system is a discreet, quiet, and powerful solution—perfect for homeowners looking to heat or cool multiple rooms from a single central indoor unit. But like any technology, there are common traps we’ve seen firsthand and help our clients avoid.
Our team shares its experience with central ducted heat pumps by revealing 5 critical mistakes to avoid to ensure optimal performance and extended system life.
1. Neglecting the Design of the Ductwork Network
One of the most common traps is thinking that all ductwork is created equal. But a poorly designed network can completely sabotage your system’s performance.
Common symptoms of poor duct sizing:
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Uneven temperatures from room to room
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Excessive air noise
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Loss of energy efficiency
At AirGreen, we carry out a full thermal analysis of the home before every installation to precisely size the ductwork, taking into account pressure drops, optimal lengths, and proper airflow balancing. This step is crucial, especially in older homes around Montréal or the South Shore, where integrating the system into the structure can be challenging.
2. Choosing a Central Unit That Doesn’t Match the Real Needs
It's common for some installers to propose an oversized system "just to be safe," or an undersized one to cut costs. Both mistakes can affect comfort and system durability.
What to avoid:
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An oversized unit leads to short cycles, which causes premature wear.
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An undersized unit runs constantly, driving up the electricity bill.
Real-world example:
In Laval, we replaced a 5-ton central system with a 3-ton Bosch BOVA model. The result: improved comfort, electricity use cut in half, and a quieter system. A proper heat load calculation is essential — and it's part of our standard approach.
3. Poor Placement of Supply or Return Grilles
Grille placement is often underestimated. Yet, poor positioning can cause uncomfortable drafts, uneven air mixing, or air pushing back in closed rooms.
At AirGreen, we design the grilles based on:
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The required airflow volume per room
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The furniture layout and room setup
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The actual use of the room (bedroom, living room, basement, etc.)
We recently corrected an installation in Longueuil, where warm air wasn’t reaching a bedroom at the end of a hallway. A simple modification to the return duct network restored balance.
4. Skimping on Duct Insulation, Especially in Unconditioned Areas
A central system can lose up to 30% of its efficiency if the ducts pass through an attic, crawlspace, or unheated garage.
We always use R-8 insulated ducts at a minimum in unconditioned zones, with special attention to sealing (tape, aluminum foil, flexible or rigid ducts properly sealed).
This is especially important in homes on the North Shore, where winters are harsh and attics are often freezing cold.
5. Skipping Regular Maintenance for Your Ducted System
A ducted system requires a structured HVAC maintenance plan, which includes:
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Cleaning the return filters
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Inspecting ducts for leaks
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Checking static pressure
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Cleaning the central unit’s coils
In Montréal, we offer an annual maintenance program that extends the life of your central heat pump and ensures healthier indoor air.
Recent example:
A client in Brossard suffered from frequent allergies. Upon inspection, we found dust and mold buildup in the ducts. After a full cleaning, symptoms disappeared and the indoor air quality drastically improved.
AirGreen’s Expertise in Ducted System Installations
We’ve installed dozens of ducted systems in various contexts: duplexes in Rosemont, heritage homes in Old Longueuil, modern bungalows in Boisbriand. Every time, our expert team adapts the solution to the building, the budget, and the client’s expectations.
Our approach is guided by:
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A detailed thermal evaluation (required BTUs)
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Choosing the ideal brand and model (Bosch, Goodman, Fujitsu, etc.)
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Smart ductwork planning
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Complete support, from grant applications to final testing
Extra Practical Tips
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LogisVert or Chauffez Vert Grants: These programs cover part of the cost when switching from oil heating to a central heat pump. We support you every step of the way.
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Smart Thermostats: Adding intelligent control helps optimize the system's energy usage.
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Zoning: Consider a multi-zone setup to customize temperature room by room.
Why Trust AirGreen for Your Ducted System Project?
Because we don’t sell promises—we deliver measurable results: better comfort, lower energy bills, whisper-quiet operation, and top-quality finishes.
We serve Montréal, Laval, Longueuil, the North Shore, and the South Shore with experienced technicians, dedicated customer service, and premium equipment.
Call us or request a free quote for your central ducted heat pump project. Together, let’s turn your home into a quiet, comfortable, and perfectly climate-controlled space.