How Poor Humidity Control Can Ruin Your Comfort, Even with a Good Air Conditioner
In Longueuil, like everywhere else on the South Shore, many homeowners think that installing a wall-mounted air conditioner or heat pump is enough to solve all their summer heat problems. However, there’s one invisible enemy that still lingers: ambient humidity. Even with a high-performing unit, an uncontrolled humidity level can cause sticky air, premature system wear, mold, and constant discomfort. At AirGreen, we’ve helped many Longueuil homeowners optimize their residential air conditioning systems by incorporating targeted humidity control solutions. Here’s a detailed review of one such project and the key lessons to be learned.
A Longueuil Client Struggling with Ineffective Air Conditioning Despite a High-End Unit
Ms. B., owner of a century-old renovated home in Longueuil, reached out to us after noticing that her Fujitsu 18,000 BTU heat pump, installed a year earlier by another company, wasn’t providing the comfort she expected. Despite the hot days, the temperature seemed tolerable... but the air remained heavy, sticky, almost suffocating.
The homeowner’s first instinct: question the unit. But at AirGreen, we know you need to look beyond the machine.
AirGreen Diagnosis: An Indoor Humidity Level Exceeding 70%
Upon arrival, we performed a complete diagnosis with our professional measuring equipment. The result: 74% relative humidity in the main rooms. However, the optimal level should be between 40% and 55%. This discrepancy perfectly explained the discomfort the homeowner felt.
Why such a gap? Two main reasons:
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The installed heat pump was working properly, but it was not configured to maximize dehumidification.
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No mechanical ventilation or standalone dehumidifier had been included in the original project.
Our Solution: Combining Effective Air Conditioning with Humidity Control
We proposed a three-pronged approach, perfectly suited to Longueuil’s climate:
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Reconfiguring the Fujitsu heat pump to optimize its dehumidification mode without affecting its energy performance.
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Installing a Lennox HRV (heat recovery ventilator) to ensure continuous and healthy air exchange, even during summer.
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Adding an intelligent dehumidifier, integrated into the HVAC system, with control via a connected wall thermostat.
This combination reduced the humidity level to 52% within the first week after installation.
Result: Improved Comfort, a Healthier Home, and Optimized Energy Bills
Less humidity means less stress on the air conditioner. This leads to:
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Better heat pump efficiency (fewer start-up cycles).
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Reduced mold and odors in less ventilated areas.
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Lower electricity consumption related to secondary devices (portable fans, mobile units).
Ms. B. told us:
“I was ready to change the entire system, but you understood the problem wasn’t the unit, it was the humidity. Since your intervention, the air feels light, fresh, and I’m rediscovering the comfort of my home.”
What Every Homeowner Should Know About Indoor Humidity
Air Conditioning Isn’t Always Enough
Even the best air conditioners or heat pumps have limits if the indoor environment isn’t balanced. A well-insulated home without proper ventilation becomes a humidity trap.
Signs of Excess Humidity
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Heavy, sticky air despite the cool temperature.
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Foggy windows even on hot days.
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Persistent odors in closets or the basement.
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Condensation on walls or ceilings.
The Solution: Think of HVAC Holistically
At AirGreen, we don’t just sell devices. We provide integrated air conditioning and ventilation solutions, tailored to Longueuil, Montreal, and the South Shore’s climate. Every project is analyzed based on the client’s needs, the home’s construction, solar exposure, insulation, and lifestyle.
Additional Installation: The Case of the Lennox HRV Installed at Ms. B.’s Home
The model chosen for this client was the Lennox HRV4-150, known for:
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Its 150 CFM capacity, ideal for homes up to 2,500 sq. ft.
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Its variable speed ECM motor, quiet and energy-efficient.
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Its washable MERV-8 filter, ensuring constant air quality.
This heat recovery ventilator not only helped stabilize the humidity level but also improved air quality by reducing pollutants and allergens.
Why AirGreen is Your Best Ally in Longueuil for Humidity and Heat Control
We are HVAC experts with hands-on experience. Our installations in Longueuil, Boucherville, Saint-Hubert, and throughout Greater Montreal have enabled us to develop a customized approach focused on long-term results and comfort. We master air conditioning, but also ventilation, dehumidification, and grants.
Whether you already have a system in place or are considering a new installation, our team is with you every step of the way:
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Free diagnostics
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Clear technical advice
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Tailored and durable products
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Optimized LogisVert grants
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Local, responsive after-sales service
Humidity isn’t always visible, but you can feel it. Don’t let it ruin your comfort.