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As a general rule, HVAC air filters should be replaced every one to three months (or every 90 days). However, the ideal frequency depends on several factors, including the filter type and your home's environment. For instance, if you use thinner filters (1-2 inches deep), have pets, have household members with allergies, smoke indoors, or frequently keep windows open, you may need to change the filter as often as once a month. It's best to follow the manufacturer's recommendation as a guideline and visually inspect the filter monthly to see if it's dirty. Regular filter changes are crucial for maintaining proper airflow, good indoor air quality, and efficient HVAC system operation.

NATE (North American Technician Excellence) certification is not legally required for HVAC technicians in most areas, but hiring a professional with this certification is highly recommended. NATE-certified technicians demonstrated their expertise and proficiency in different types of HVAC systems, offering assurance of quality service. It's a voluntary certification, yet it indicates a commitment to professionalism and ongoing training. Choosing a NATE-certified technician often means you're working with someone who is up-to-date on industry standards and best practices, which can lead to better service, energy efficiency, and long-term cost savings.

According to the Centers for Disease Control and Prevention (CDC), no single water filter or treatment system can remove 100% of contaminants. To find the best filter for your needs, first determine which impurities are most important for you to remove. For example, reverse osmosis (RO) filters are highly effective at removing a wide range of contaminants, including sediment, heavy metals, bacteria, viruses, dissolved salts, and chemicals. However, the RO process can also filter out beneficial minerals like calcium and magnesium. If eliminating bacteria is your main priority, a UV filter could be a suitable choice. Additionally, distilled water is considered the most pure form of filtered water available.

No, air purifiers neither cause dry air nor increase the home's humidity levels. They remove allergens and dust but don't alter the water content in indoor air. However, because some air purifiers move large volumes of air, the areas immediately surrounding a portable unit can feel cooler and dryer than the rest of the home.