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La climatisation idéale pour votre chalet : les erreurs classiques à éviter absolument
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The Ideal Air Conditioning System for Your Cottage: The Most Common Mistakes to Absolutely Avoid

Comfort, Efficiency, and Longevity: Choosing Right to Fully Enjoy Your Getaway

Installing an air conditioning system in a cottage located on the North Shore, in Montréal, Longueuil, or on the South Shore is far more than just mounting a unit on the wall. It’s a thoughtful investment that must take into account several critical elements: building insulation, seasonal needs, energy constraints, and long-term reliability. At AirGreen, we’ve helped hundreds of clients make this important decision, and over the years, we’ve seen the same recurring mistakes that compromise performance and comfort. Here’s what we’ve learned from our real-world installations, with practical advice to help you avoid unpleasant surprises.

Real Example: A Poor First Installation in Rawdon, Corrected by AirGreen

A retired couple recently contacted us about an issue with their wall-mounted air conditioner installed two years ago in their Rawdon cottage. The unit—a basic 12,000 BTU model—struggled to cool the main living area, especially during peak heatwaves. Upon inspection, we identified several major flaws:

  • Improper sizing (insufficient BTUs for the floor space and high ceilings)

  • Unit installed too close to the ceiling, causing poor air circulation

  • No HVAC maintenance, with clogged filters after just one year

  • No insulation in some sections of the roof

After removing the old unit, we recommended and installed a FUJITSU KZAH 18,000 BTU wall-mounted heat pump featuring Inverter technology, outstanding energy efficiency (SEER over 20, R-32 refrigerant, quiet operation, and heating capability down to -26°C). The result: even temperature throughout, a discreet system, and most importantly, a nearly 30% reduction on their annual energy bill.

The Most Common Mistakes to Absolutely Avoid

Based on our experience working in hundreds of cottages across Québec, here are the most frequent errors:

Choosing an Undersized Unit

This is the most common mistake. A 9,000 or 12,000 BTU air conditioner might be enough for a downtown condo, but not for an open-plan cottage, often featuring mezzanines, cathedral ceilings, and poorly insulated wood walls. It’s essential to assess:

  • The actual square footage to be cooled

  • The vertical layout of the space

  • Potential thermal leakage points

Installing the Unit in the Wrong Place

Too high, too low, or poorly oriented—a bad HVAC installation can ruin the efficiency of even the best system. Our certified installers make sure to follow:

  • An optimal mounting height for air distribution

  • Unobstructed airflow for proper circulation

  • A secure installation protected from infiltration

Neglecting HVAC Maintenance

Cottages are often used during summer and left empty in winter. The result: condensation, dust buildup, and mold growth. Without annual maintenance, a high-performance system quickly becomes a bacterial trap. AirGreen offers full servicing including:

  • Coil cleaning

  • Condensate pan sanitization

  • Filter replacement

  • Electrical connection inspections

AirGreen’s Top System Picks for Cottages

Here are the units we most often recommend for cottages located in Montréal, Laval, Longueuil, the North Shore, and the South Shore:

  • Fujitsu KZAH R-32 | 18,000 BTU: consistently high performance, energy efficient, perfect for larger cottages

  • Gree Lomo R-32 | 24,000 BTU: great price-performance ratio, heating down to -25°C, ideal for seasonal residences

  • Bosch BOVA36 | 3 tons (central system): for renovated cottages with existing ductwork. Ultra-quiet operation, Inverter technology

All these models are eligible for Hydro-Québec’s LogisVert grants, significantly reducing the initial installation cost.

AirGreen’s Tips for a Successful Installation

  • Work with specialists: every cottage is unique. At AirGreen, our evaluations are free and fully customized

  • Ask for an energy simulation: we’ll show you the difference in consumption before and after installation

  • Choose a reversible system (heating/cooling) to maximize your investment

  • Check available grants based on your municipality

Conclusion: Your Comfort Depends on That First Decision

Choosing the right air conditioning system for your cottage lays the foundation for long-lasting comfort and intelligent energy use. Too many owners make rushed choices based on price or poor advice—only to call AirGreen in an emergency later. By choosing us from the beginning, you get:

  • A precise diagnosis

  • A professional installation

  • Full aftercare, tailored to your seasonal home usage

We serve all of Québec with proven expertise, certified installations, and solutions tailored to every cottage, whether rustic or high-end.

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