How to Reduce Allergens with Your HVAC System

Allergens like pollen, dust mites, mold spores, and pet dander don’t just exist outside—they circulate through your indoor air, impacting occupant comfort, productivity, and health. For commercial and industrial facilities, controlling allergens isn't just about comfort—it’s about creating healthier indoor environments, reducing employee sick days, and maintaining efficient system operation. 

Thankfully, your HVAC system can play a vital role in managing indoor air quality and reducing allergens—if it’s designed and maintained with that goal in mind. 

In this month’s Northstar University blog, we’ll cover the key ways your HVAC system can help reduce allergens and improve indoor air quality (IAQ) for your building or facility. 

How HVAC Systems Can Help Control Allergens 

1. Use High-Quality Air Filters 

    The first line of defense against airborne allergens is your system’s air filter. Standard fiberglass filters may  
protect your HVAC system, but they’re not effective at capturing smaller particles like pollen and mold spores.  

 For allergen reduction, consider upgrading to: 

• MERV 11–13 filters for most commercial systems 

• HEPA filters (if your system is compatible) for sensitive environments like healthcare or labs 

Pro tip: Check and replace filters regularly clogged filters reduce airflow and trap fewer particles over time. 

MERV Ratings & What They Capture 

2. Maintain Ductwork 

    Leaky, dirty, or poorly insulated ducts can introduce allergens into your system and recirculate them throughout your building. Schedule regular duct inspections and cleanings to: 

• Remove accumulated dust and debris 

• Seal leaks that allow allergens to enter 

• Prevent mold growth in humid areas 

 3. Add Air Purification Technology 

    HVAC-integrated air purifiers offer an extra layer of protection. Depending on your facility’s needs, consider: 

• UV-C light systems to kill bacteria and mold 

• Bipolar ionization units to neutralize allergens and VOCs 

• Activated carbon filters to remove odors and gaseous pollutants 

    These enhancements are especially useful in schools, offices, and high-occupancy spaces. 

4. Control Humidity 

    Humidity control is essential to minimizing allergens like mold and dust mites. Your HVAC system should maintain relative humidity between 30% and 50%. 

• Install humidifiers or dehumidifiers as needed 

• Use your building automation system (BAS) to monitor and adjust humidity levels 

• Regularly inspect for leaks or pooling water around HVAC components

5. Stay on Top of Preventative Maintenance 

    Even the best system can fail to control allergens if it’s not properly maintained. A preventative maintenance plan ensures that: 

• Filters are changed regularly 

• Coils are cleaned and sanitized 

• Fans, blowers, and ductwork are inspected 

• IAQ devices are tested and calibrated 

    At Northstar Refrigeration, we tailor our maintenance plans to meet your indoor air quality goals—whether it’s for health compliance, productivity, or occupant comfort. 

Who Benefits from Allergen-Reducing HVAC Practices? 

• Offices: Improved employee comfort and productivity 

• Schools: Healthier environments for students and staff 

• Healthcare: Compliance with air quality standards and infection control 

• Warehouses: Protection of sensitive inventory 

• Hospitality: Better guest experiences and reviews 

Northstar is Here to Help 

From filter upgrades to full IAQ system retrofits, Northstar Refrigeration has the knowledge and experience to help you reduce allergens and improve your building’s indoor environment. Let us evaluate your current system and recommend strategies that align with your goals, budget, and building type. 

Call us at (508) 888-3692 to schedule a system evaluation or learn more about improving your building’s indoor air quality. 

(508) 888-3692 
www.northstarhvacr.com