
Whole house air filtration units are installed between a furnace and the return air duct and are installed so they can capture airborne particles such as pollen, dust, spores, dander, bacteria and many other harmful particulates. Some air cleaners are non-electric media and others have a combined media and electric air filtration capability, the later being the best whole house air filter.
Performance of these air filters is measured in terms of how efficient they are at trapping micron-sized particles.
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Indoor air quality (IAQ) refers to the overall condition of the air inside a building, which impacts the health, comfort, and productivity of its occupants. It's determined by the concentration of various pollutants, including dust, pollen, and chemical compounds, as well as factors like temperature, humidity, and ventilation. Poor IAQ can lead to a range of health issues, from minor irritations like headaches and fatigue to more serious respiratory problems. Therefore, managing IAQ is essential for creating a safe and comfortable environment, whether in a home, office, or school.
The most common indoor air pollutants related to HVAC systems are typically categorized as biological, particulate, and chemical. Biological contaminants like mold spores, bacteria, and viruses often thrive on the moisture and debris found on a system's evaporator coils and in its ductwork. Particulate matter, such as dust, pollen, and pet dander, is constantly circulated by the HVAC system, and if the filter is old or low-quality, these tiny particles are not effectively removed from the air. Finally, chemical pollutants, including Volatile Organic Compounds (VOCs) from cleaning supplies and building materials, as well as carbon monoxide from a faulty furnace, can be distributed throughout the building by a system with poor ventilation.
Regular professional HVAC maintenance, including coil cleaning, is crucial for improving indoor air quality. The easiest step is upgrading your air filter to a higher MERV rating to trap more particles. For a more advanced solution, integrating a UV light or an air scrubber can actively neutralize viruses and allergens throughout your home. Also, ventilating your home with open windows allows fresh air to come in and dilute any air pollutants that may already be inside your home. Opening the windows and even doors for 10 minutes a day while the air quality outside is good is a practical step that can be done today.
Poor indoor air quality can have a wide range of negative health effects, from minor discomforts to serious, long-term conditions. Immediate symptoms often include headaches, fatigue, dizziness, and irritation of the eyes, nose, and throat. For individuals with pre-existing respiratory conditions like asthma or allergies, poor IAQ can trigger severe attacks and worsen symptoms. In the long term, continuous exposure to pollutants like mold, carbon monoxide, and volatile organic compounds (VOCs) can contribute to the development of chronic respiratory diseases, heart disease, and even certain types of cancer.

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