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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.

There are several reasons why your furnace filter might get dirty quickly. For example, if you run your furnace often, more air—and therefore, more contaminants—will flow through the system and clog your filter. Having pets is another reason that your filter accumulates dirt quickly. Also, thinner filters will get dirty faster than thicker ones.

While a whole-house air purification system is more expensive than a portable or room-sized air purifier, they have very different expectations to live up to. Room-level purifiers are available for well under $100, while whole-house units can cost up to several thousand. For individuals in the home with conditions that warrant the use of an air purifier, balancing needs against budget is necessary to determine if the extra cost of a whole-home system is worth it.

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.