Your HVAC system circulates all the air in your home multiple times per day. With the right approach, it can significantly reduce indoor allergens.
Common Indoor Allergens
- Dust and dust mites
- Pet dander
- Pollen
- Mold spores
- Cockroach particles
- Bacteria
HVAC-Based Solutions
Filter Upgrades
MERV Ratings for Allergies: - MERV 8: Basic allergen control - MERV 11: Effective for most allergens - MERV 13: Excellent allergen capture - HEPA: Maximum filtration (may need modification)
Recommendation: MERV 11-13 for allergy sufferers
Filter Maintenance - Check monthly - Replace at first sign of dirt - More frequent changes during high pollen seasons - Consider allergy-specific filters
Air Purification Add-Ons
UV Light Systems - Kill mold and bacteria - Install in ductwork - Low maintenance - Cost: $400-$800 installed
Electronic Air Cleaners - Trap particles electrically - Washable components - Very effective - Cost: $600-$1,200 installed
HEPA Bypass Filters - Hospital-grade filtration - Doesn't restrict airflow - Maximum allergen removal - Cost: $1,000-$2,500 installed
Humidity Control
Why It Matters: - Dust mites thrive above 50% humidity - Mold grows in high humidity - Dry air irritates airways
Ideal Range: 30-50% humidity
Solutions: - Whole-home humidifier (winter) - Whole-home dehumidifier (if needed) - Monitor with hygrometer
Operational Strategies
Run Fan Continuously - Filter air constantly - Better allergen capture - Slight energy increase - Worth it for severe allergies
Regular Duct Cleaning - Every 3-5 years - After renovations - When moving into new home - If visible mold or debris
Seal Ductwork - Prevents unfiltered air entry - Reduces dust infiltration - Improves overall air quality
Room-by-Room Tips
Bedrooms - Highest priority for clean air - Consider portable HEPA filter - Keep doors closed during high pollen - Vacuum with HEPA weekly
Living Areas - Main filtration handles these - Vacuum regularly - Control pet access if needed
Problem Areas - Basements: Watch for mold - Bathrooms: Good ventilation - Kitchens: Use exhaust fans
Bay Area Allergy Seasons
Spring (Feb-May) - Tree pollen peak - Grass pollen begins - Upgrade filters
Summer - Grass pollen continues - Less tree pollen - Maintain filters
Fall (Aug-Oct) - Weed pollen (ragweed) - Mold from rain - Check filters frequently
Winter - Indoor allergens predominate - Dust mites in heated homes - Focus on humidity control
Creating an Allergen-Reduction Plan
- Upgrade to MERV 11+ filters
- Change filters monthly during peak seasons
- Consider UV light or air cleaner
- Maintain proper humidity
- Run fan more during high pollen days
- Schedule duct cleaning if overdue
Your HVAC system is your best tool for whole-home allergen control. The right upgrades can make a significant difference in allergy symptoms.