Indoor Air Quality: How to Improve It in Your Home
By Top HVAC Services Editorial Team · Apr 5, 2026 · 9 min read
Quick Answer: Indoor air is often 2-5x more polluted than outdoor air. Here are 8 proven ways to improve IAQ in your home, ranked by cost-effectiveness.
The EPA reports indoor air is typically 2-5x more polluted than outdoor air. With Americans spending 90% of their time indoors, indoor air quality directly affects sleep, allergies, and long-term health.
1. Upgrade your air filter ($15-$60)
Most homes use cheap fiberglass filters with MERV 1-4 ratings. Upgrade to MERV 11-13 to capture pollen, pet dander, and most viruses.
2. Install whole-home air purifier ($500-$1,500)
HEPA + activated carbon systems install on your existing HVAC. Captures 99.97% of particulates including viruses and VOCs.
3. UV-C light kit ($300-$800)
UV-C lamps mounted near the evaporator coil kill mold, bacteria, and viruses passing through. Especially useful in humid climates.
4. Whole-home humidifier/dehumidifier ($600-$2,000)
Maintain 30-50% RH year-round. Lower = dry skin, sinus issues. Higher = mold, dust mites.
5. ERV / HRV ($1,200-$3,500)
Energy/heat recovery ventilators bring fresh outdoor air in while preserving heating/cooling. Critical in tight, modern homes.
6. Duct cleaning ($350-$800)
Effective if your ducts have visible mold, rodent debris, or have not been cleaned in 5+ years. Otherwise minimal benefit.
7. Test for radon ($25 DIY)
Radon is the #1 cause of lung cancer in non-smokers. EPA recommends every home test.
8. Source control
The cheapest improvement: don't use scented candles, switch to fragrance-free cleaners, ventilate when cooking.
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