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A correctly installed air filter will fit snugly in its compartment. One that’s too thick or big won’t lie smoothly, and it can block the airflow, sometimes resulting in strange noises. A filter that’s too small or improperly fitted may move around in the compartment, resulting in strange humming or vibration noises. Poor fitting can eventually cause a buildup of dirt in the HVAC ductwork, and reduced indoor air quality can lead to sneezing or excess dust on your surfaces.

A HEPA filter is a powerful tool for clean air, but the structure doesn’t allow much air to pass through it. That means your HVAC motor must work harder to keep your air pressure consistent, which can result in higher energy bills. That, coupled with the higher cost of HEPA filters, may not make them the best choice for your HVAC system.

While you can run your HVAC system without an air filter, it isn’t something professionals recommend—especially not for an extended period. It can reduce indoor air quality, clog air ducts, and strain your system. This can lead to performance issues, higher energy bills, costly repairs, and a reduction in the system's lifespan.

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.