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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.

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.

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.

How often you change your air filter depends on your home and lifestyle. Things like how many people are in your home, pets, the season, the size of your home, the air quality where you live, and more all impact your HVAC system. The best practice is using visual indicators to determine when it needs changing by checking if light can pass through it. If you can’t see any light, it’s clogged and needs to be changed.