The EPA estimates that indoor air can be two to five times more polluted than outdoor air. In Greenville's climate, where homes remain sealed for both heating and cooling seasons, indoor pollutants like dust, pollen, pet dander, mold spores, and volatile organic compounds (VOCs) accumulate without adequate filtration and ventilation. Poor indoor air quality affects your health, your comfort, and your HVAC system's efficiency.
First Class Heating & Air provides comprehensive indoor air quality solutions for Greenville homes and businesses. Our services include ductwork inspection and sealing, air purification system installation, whole-home humidifiers and dehumidifiers, UV germicidal light systems, and high-efficiency filtration upgrades that capture particles as small as 0.3 microns.
Ductwork problems are one of the most overlooked contributors to poor air quality. The average home loses 20 to 30 percent of its conditioned air through duct leaks, according to ENERGY STAR. These leaks also pull in unfiltered air from attics, crawl spaces, and wall cavities, introducing dust, insulation fibers, and moisture into your living space. Our duct sealing service uses mastic and mechanical fasteners to permanently close these gaps.
Greenville's high pollen counts (the Upstate regularly ranks among the worst in the nation for spring and fall allergies) make air filtration especially important for local homeowners. Upgrading from a basic fiberglass filter to a MERV-11 or MERV-13 media air cleaner captures 85 to 95 percent of airborne particles, dramatically reducing allergy and asthma triggers without restricting airflow to your HVAC system.
Humidity control is another critical component of indoor air quality in the Greenville area. Summer humidity levels often exceed 70%, which encourages mold and dust mite growth. Winter heating can drop indoor humidity below 30%, causing dry skin, irritated sinuses, and static electricity. Whole-home humidifiers and dehumidifiers integrate with your HVAC system to maintain optimal humidity between 40% and 50% year-round.
For homes concerned about bacteria, viruses, and biological contaminants, we install UV germicidal light systems inside your ductwork. These lights use ultraviolet-C radiation to neutralize microorganisms as they pass through the air handler, reducing the biological load in your home's air without chemicals or ozone.

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