Reduce Allergens with Your HVAC System

How HVAC Systems Help Reduce Allergens in Your Home

If you or someone in your home suffers from allergies, you're not alone. Common allergens like dust mites, pet dander, mold, and pollen can make indoor air uncomfortable and even harmful. Luckily, your HVAC system can help reduce these allergens and improve your indoor air quality.

In Los Angeles the load on your system is heavier than most of the country. Valley smog, a pollen season that effectively never ends, and wildfire smoke that can blanket the region for days all arrive through the same air your HVAC system is moving. By using filtration, ventilation, humidity control, and regular maintenance, your system can help create a cleaner, healthier home.

1. Filtration: Catching Allergens in the Air

Your HVAC system's air filter is the first line of defense against allergens.

• HEPA filters (High-Efficiency Particulate Air) are especially good at trapping tiny particles, some as small as 0.3 microns! That includes dust, pollen, pet dander, and mold spores.
• It’s important to change or clean your filter regularly so it doesn't get clogged and keeps working well.

How to Choose the Right Filter: Understanding MERV Ratings

Filters are rated on the MERV scale, which runs from 1 to 16 for residential equipment. The higher the number, the smaller the particles the filter captures. For perspective on the sizes involved, a human hair is roughly 50 microns across, and the particles that trigger most allergy symptoms are a fraction of that.

• MERV 8: captures dust, pollen and dust mite debris. A reasonable baseline for a home without allergy sufferers.
• MERV 10 to 12: adds finer pet dander and mold spores. This is the range most Los Angeles households with allergies should be in.
• MERV 13: the level generally recommended for wildfire smoke, because it captures the fine particulate that makes smoke dangerous. Worth switching to when smoke is in the forecast.
• MERV 14 to 16 and true HEPA: hospital-grade filtration, but be careful. A filter this dense restricts airflow, and residential systems that were not designed for it can freeze coils or strain the blower motor. Ask your technician whether your equipment can handle it before installing one.

If someone in the home has allergies or asthma, check the filter monthly rather than quarterly. During pollen season and after any smoke event, expect to replace it sooner than the package says.

2. Humidity Control: Keep Moisture Balanced

Too much moisture in the air can help allergens grow, especially mold and dust mites.

• HVAC systems can include humidifiers or dehumidifiers to keep the indoor air balanced.
• The ideal humidity level is between 30% and 50%.
• This helps stop mold and mildew and keeps the air healthier to breathe.

3. Ventilation: Bring in Fresh Air

Good airflow is key to keeping indoor air clean.

• HVAC systems pull out stale indoor air and replace it with fresh outdoor air.
• This reduces allergen buildup by moving pollutants out and bringing clean air in.
• Placing vents and fans in the right spots helps keep air moving throughout your home.

4. Sealing Ductwork: Stop Outside Allergens from Sneaking In

If your ducts have leaks, outside allergens like pollen and dust can enter your system and spread through the house.

• Sealing your ductwork stops these leaks. Proper sealing uses mastic or foil-backed tape at the joints, not standard duct tape, which dries out and fails.
• It also helps your HVAC system run more efficiently by sending air exactly where it's needed without contamination.

5. Regular Maintenance: Keep Your System Running Clean

Like any machine, your HVAC system needs regular checkups to keep working well.

• Clean the coils, change filters, and have your ducts inspected regularly.
• This helps prevent allergens from building up and keeps the system running smoothly.
• A professional HVAC tune-up can catch problems early and improve your indoor air quality.

6. UV Lights & Air Scrubbers: Kill Germs and Mold

You can add UV lights or an air scrubber to your HVAC system for extra protection.

• UV lights use special light to kill bacteria, mold, and viruses as air passes through the system.
• An air scrubber goes even further by sending out ions that help trap and destroy germs both in the air and on surfaces. Most units pair UV-C light with photocatalytic oxidation to treat both the air and the surfaces in the room.

These systems are great for people with allergies or asthma.

7. Air Purifiers: Extra Help in Specific Rooms

In addition to your HVAC system, you can use portable air purifiers in bedrooms or living areas.

• Look for purifiers with HEPA filters for the best allergen control.
• They help remove extra dust, pollen, and dander in the areas you use most.

8. Pest Control: Fighting Dust Mites Naturally

Did you know your HVAC system can help with pest control too?

• Dust mites love warm, humid places.
• By keeping your home’s humidity under control and improving airflow, your HVAC system helps make the environment less inviting for these tiny pests.

Building Air Quality Into a New System Installation

The cheapest time to solve an air quality problem is while the equipment is being replaced, not after. If you are planning an AC replacement or a new system, ask your contractor to include these in the scope of work:

• A filter cabinet sized for the MERV rating you actually want, rather than a one-inch slot that limits you forever
• Duct sealing and repair while the system is open and accessible
• An air scrubber or UV system installed in the plenum at the same time as the equipment
• A test and balance pass after startup, so every room gets the airflow the design calls for
• Fresh air ventilation sized to the home rather than left to leaks and open windows

Contact Our Indoor Air Quality Specialist

In the battle against indoor allergens, HVAC systems emerge as indispensable allies, offering multifaceted solutions for allergen reduction. Through advanced filtration, precise humidity control, strategic ventilation, and diligent maintenance, HVAC systems create a healthier indoor environment, free from the scourge of allergens.

By harnessing the capabilities of HVAC technology and adopting proactive allergen mitigation strategies, homeowners can enjoy cleaner air, improved respiratory health, and enhanced overall well-being within the sanctuary of their homes. Give us a call today or contact us online to schedule maintenance, air scrubber installation, air conditioning repair, or AC replacement. See our full range of air quality solutions in Los Angeles.

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