Is Your HVAC System Making Your Allergies Worse?

Dirty Air Filters Can Circulate Allergens

Your HVAC filter is your home’s first line of defense against pollen, dust, pet dander, and other airborne particles. However, when filters become clogged or remain unchanged, they can’t perform their intended function. Worse, dirty filters can actually blow irritants back into your living space.

Solution: Replace your filter every 1–3 months, or more often if you have pets or seasonal allergies. Consider using a HEPA or high-MERV-rated filter for added protection.

Ductwork May Be Full of Dust and Debris

Over time, your home’s ductwork can collect layers of dust, mold spores, and other particles. Every time your furnace or A/C runs, these allergens can get stirred up and blown into every room.

Signs of dirty ducts:

• Visible dust near vents
• Musty odors
• Increased allergy symptoms when indoors

Tip: If your ductwork hasn’t been inspected in years, it might be time to schedule a professional cleaning or evaluation. Contact H&S Heating and A/C today!

High Humidity Can Worsen Indoor Allergens

In the summer, high humidity levels can make your home a breeding ground for mold, mildew, and dust mites—common triggers of allergies. Your air conditioner helps remove some moisture, but it may not be enough on its own.

Solution: Use a whole-home dehumidifier to keep indoor humidity between 30–50%. This creates a less hospitable environment for allergens.

Mold Can Grow in A/C Units or Around Vents

Moisture buildup inside your A/C system—especially around coils or drainage lines—can lead to mold growth. If you notice black spots, musty smells, or allergy flare-ups when your A/C runs, mold could be the cause.

Prevention Tip: Schedule annual HVAC maintenance with a company like H&S to check for mold, leaks, and drainage issues before they become a health concern.

Poor Ventilation Traps Allergens Indoors

A tightly sealed home is excellent for energy efficiency, but it can also trap stale air and pollutants inside. Without proper ventilation, allergens accumulate and recirculate every time your system runs.

Solution: Consider air purifiers, upgraded filtration systems, or energy recovery ventilators (ERVs) that bring in fresh air without sacrificing comfort.