How HVAC Filters Affect Allergies
Allergy season doesn't just happen in spring—indoor allergens can cause symptoms year-round. One of the most effective ways to reduce allergens in your home is by choosing the right HVAC filter.
What Triggers Indoor Allergies?
For many people, allergies aren’t just a seasonal nuisance—they’re a year-round struggle. Take Mia, for instance, a mom of two who noticed that no matter how clean she kept her house, her kids always seemed to be sneezing, especially during bedtime. She vacuumed regularly, avoided opening windows, and even replaced the carpet. But the culprit? Her HVAC system’s old, inefficient filter.
Indoor allergies are often triggered by:
Pet dander
Pollen tracked indoors
Mold spores from excess humidity
Dust mites that live in bedding and upholstery
Cockroach droppings (surprisingly common in older homes)
These allergens can linger in the air and cycle through your vents unless your HVAC system is equipped with the right filter. That’s why understanding and choosing the right filtration system is crucial—not just for comfort, but for health.?
Pet dander
Pollen tracked indoors
Mold spores
Dust mites
Cockroach droppings (yes, really!)
Your HVAC filter can trap many of these allergens—if you’re using the right one.
Understanding MERV Ratings
Filters are rated on a MERV scale (1–20):
MERV 1–4: Basic filtration (pollen, dust)
MERV 5–8: Better dust control, some pet dander
MERV 9–12: Traps mold spores, fine dust, some bacteria
MERV 13+: Excellent for allergy and asthma sufferers
For most allergy-prone homes, MERV 11 or higher is ideal.
How Often Should You Replace Your Filter?
Every 1–3 months for standard filters
Every 6–12 months for HEPA or specialty filters
Check more often if you have pets or high usage
Other Allergy-Friendly HVAC Tips
Keep windows closed during high pollen seasons
Clean ducts and vents annually
Use a vacuum with a HEPA filter
Install UV lights in your HVAC system
👉 Breathe easier by upgrading your HVAC filters with Decker Heating & Cooling.
