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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.

You should plan to change your AC unit's filter every one to three months, depending on the manufacturer's recommendations. You should also clean the coils at least once per year, but if you have pets or someone in your household has allergies, you might need to clean them more often. Fortunately, many pros will clean the coils and change the filter for you during an inspection, which you should schedule once or twice per year.

Always turn off the power to your HVAC system before you remove the front cover to replace the air filter. If there isn’t an off switch, turn it off at the circuit breaker box. This prevents the risk of electric shock and stops unfiltered air from passing through the ductwork while the thermostat is running.

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.