Each spring, it’s the same scenario. You close the windows to avoid pollen, but the sneezing continues. Runny nose, irritated eyes, persistent congestion. What if the problem was coming from inside? Your ventilation system plays a major role in the air quality you breathe at home.
This article explains what to do for a milder allergy season.
Do you think you are protected from pollen by staying inside? Not really. Canadians spend most of their time indoors. And indoor air can contain more allergens than outdoor air. Surprising? Not really when you understand how your ventilation system works.
Pollen gets in everywhere. Windows, doors, clothing, hair. Once inside, it accumulates in your ventilation ducts for months, even years. The result? Every time your system starts, it recirculates these particles throughout every room in the house.
| Situation | What it means | What to do |
| Dust around vents | Build-up inside ducts | Inspection recommended |
| Symptoms worse indoors | Air possibly contaminated | Check filters and ducts |
| Odors when system starts | Mold or debris | Professional cleaning |
| Humidity above 50% | Favorable conditions for dust mites | Adjust the air exchanger |
A well-maintained ventilation system becomes your ally against allergies. Good news: solutions exist.
Effective filtration. Filters capture pollen and spores before they circulate. MERV 11 filters effectively capture pollen particles and other allergens responsible for symptoms.
Air renewal. A functional air exchanger expels stale air and brings in fresh filtered air. That is its main role.
Humidity control. A level between 30% and 50% limits dust mite and mold growth. Too humid? Allergens multiply.
The most common mistake? Neglecting duct cleaning for years. People often think that what they can’t see isn’t a problem. Wrong. Layers of dust and pollen silently accumulate in your ducts, ready to be redistributed into the air you breathe.
Another common trap: low-quality filters. Saving a few dollars on a cheap filter means letting fine particles pass directly into your air. Bad idea. Same thing for the air exchanger that people forget to maintain. A clogged unit barely filters anything.
In Quebec, pollen season runs from late March to October. That’s long. Trees release pollen from April to June, grasses take over from May to July, then ragweed dominates from August to October. For sensitive people, that’s nearly seven months of potential symptoms.
The ideal time to have your ducts cleaned? February or March, before spring arrives. This way, you start the season with a clean system.
A few simple habits make a difference. Replace your filters regularly, more often during pollen season. Run your air exchanger continuously rather than intermittently. Maintain humidity between 30% and 50%. And vacuum using a HEPA filter to avoid putting dust back into the air.
Seasonal allergies are uncomfortable, but you are not without options. Your ventilation system can become a real relief tool rather than a source of problems. Regular maintenance and professional cleaning make a noticeable difference in your symptoms. Sometimes within the first few days.
Need to evaluate your system? The team at Ventilo Exp’air can inspect your ducts and recommend the right solutions for your situation.
Contact us for a quote.
Yes, professional cleaning makes a real difference for people with allergies. By removing dust, pollen, and mold that have accumulated in your ducts over the years, it significantly reduces the amount of allergens recirculated each time your ventilation system turns on.
Check your filters every month during pollen season, from April to October in Quebec. During peak pollen periods or if you have pets, replacement every 4 to 6 weeks is often necessary to maintain good indoor air filtration.
Yes, a poorly maintained air exchanger or one equipped with clogged filters can allow pollen particles into your home. Regular maintenance of the recovery core and periodic filter replacement ensure effective filtration of the outdoor air entering your home.
Choose MERV 11 filters or higher for effective protection against airborne allergens. These filters capture fine particles such as pollen, mold spores, and microscopic dust mites. HEPA filters offer even greater protection if your ventilation system supports them.
Absolutely. A clean ventilation system improves air quality for everyone in the home, reduces visible dust on furniture and floors, optimizes the energy efficiency of your heating and cooling equipment, and significantly extends their lifespan.
