HVAC Making Allergies Worse
Does your HVAC make allergies worse? Learn how your heating and cooling system affects allergies and what you can do about it.
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Understanding the Problem
If your allergy symptoms get worse when you're at home or when the HVAC runs, your heating and cooling system may be circulating allergens throughout your house. This is a common problem with solutions. Your HVAC can spread dust, mold spores, pet dander, and pollen if not properly maintained and filtered. The good news is that the right upgrades can actually make your HVAC a powerful tool for allergy relief.
Common Symptoms
You might be experiencing this problem if you notice:
- Allergies worse when HVAC runs
- Symptoms improve when leaving home
- Dust visible coming from vents
- Sneezing, congestion, itchy eyes at home
- Symptoms worsen when heat or AC turns on
Possible Causes
This problem can be caused by several factors, listed from most to least likely:
Inadequate air filter
Upgrade to MERV 11-13 filter. Higher captures more allergens.
Dirty ductwork
Professional duct cleaning to remove accumulated allergens.
Mold in system
Professional coil cleaning and mold remediation. Consider UV light.
Dirty evaporator coil
Professional coil cleaning during maintenance.
Duct leaks
Professional duct sealing.
Lack of air purification
Add whole-home air purifier, HEPA filter, or UV light system.
DIY Troubleshooting Steps
Before calling a professional, try these safe troubleshooting steps:
- 1
Upgrade to a MERV 11-13 filter
- 2
Replace filter more frequently (monthly)
- 3
Vacuum vents and registers
- 4
Keep pets out of bedrooms
- 5
Reduce indoor allergen sources
When to Call a Professional
Contact a licensed HVAC technician if:
- Symptoms persist after filter upgrade
- You haven't had ducts cleaned in years
- You see mold near vents or in the system
- You want professional air quality assessment
- Interested in air purification options
Prevention Tips
Help prevent this issue in the future with these maintenance tips:
- Use quality filters and change monthly
- Schedule annual HVAC maintenance
- Consider UV light installation
- Keep humidity between 40-50%
- Have ducts cleaned every 3-5 years
Estimated Repair Cost
* Actual costs may vary based on the specific cause, parts needed, and system type. We provide upfront pricing before any work begins.
Need Help With This Issue?
Our expert technicians can diagnose and fix this problem quickly.
Call (650) 540-7205Book Service OnlineQuick Facts
- Category:air-quality
- Urgency:Moderate
- DIY Fixes:1 of 6 causes
- Est. Cost:$50-$100 (quality filters) to $400-$800 (duct cleaning) to $500-$2,000 (purification)
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