As trees bud and flowers bloom, allergy sufferers brace for impact. But did you know your home’s ventilation system, specifically an HRV or ERV, can do more than just manage energy loss? In fact, it can actively help reduce allergy symptoms indoors. Here’s how!
Filtered Fresh Air In, Pollens Out
HRVs and ERVs continuously bring in outdoor air, but with a major advantage: it’s filtered. High-efficiency filters (MERV 13 or higher) can trap pollen, dust, and other allergens before they enter your breathing space.
Most people assume opening windows is the best way to “air out” a home in spring, but that can let in high volumes of pollen and particulate matter. A properly balanced HRV/ERV gives you that fresh air benefit without all the sneezes. For homeowners with respiratory sensitivities or children with asthma, this becomes a major quality-of-life improvement.
Balanced Pressure Prevents Contaminant Infiltration
In spring, fluctuating temperatures and shifting wind patterns can create uneven pressure zones inside your home. This often results in unfiltered outdoor air being pulled in through cracks, gaps, and weak points like window seals, attic hatches, and garage doors—bringing allergens in with it. Pressure imbalances are a hidden contributor to poor indoor air quality, especially in homes without dedicated ventilation.
HRV and ERV systems help regulate this by balancing indoor and outdoor air pressure, minimizing the suction effect that draws pollen and other contaminants indoors. They maintain a steady, controlled airflow throughout the house, preventing unwanted infiltration from areas like attics or crawlspaces. This is especially important in newer, airtight homes, where stale air and pressure issues can build quickly without mechanical ventilation.
Humidity Control = Fewer Dust Mites & Mold Spores
What most people don’t realize is that dust mites thrive when humidity rises above 50%, which is common in Canadian springtime when wet ground and warmer air collide. Mold spores also become more active in higher humidity, particularly in basements or poorly ventilated bathrooms.
ERVs, in particular, manage both moisture and heat without the need for a separate dehumidifier. Maintaining indoor humidity in the 40–50% range helps inhibit mould growth and dust mites, which are major indoor allergy triggers, especially during damp spring months.
Little-Known Tip: Filter Types Matters
Most homeowners don’t realize the filters inside their HRV/ERV unit are just as important as their furnace filter. Upgrading these internal filters to pleated, washable versions with higher MERV ratings can significantly improve allergen removal at the source.
Our service techs often find HRV/ERV filters that have been overlooked for years. These filters can become clogged with pollen, pet dander, and even mould if neglected—essentially turning your ventilation system into a circulation problem. If you’re especially allergy-prone, consider pairing your HRV/ERV with a whole-home HEPA filter for medical-grade protection.
Upgrade Your Spring Air Quality Today with Guelph ClimateCare
If you suffer from seasonal allergies, an HRV or ERV can offer you a major indoor air quality upgrade. With the right filter setup and basic maintenance, it can noticeably reduce allergy symptoms and help you breathe easier all year long.
Contact Guelph ClimateCare today to learn more about our solutions.
