The answer to 'difference between air filter and' is that an air filter and an air purifier serve different purposes in an HVAC system. An air filter is designed to remove large particulates, like dust and pet dander, from the air circulating through your home. An air purifier, on the other hand, uses advanced technology like HEPA filters or UV light to capture and remove smaller airborne contaminants like allergens, bacteria, and viruses.
Air filters are a more basic and affordable way to improve indoor air quality, while air purifiers provide a more comprehensive solution for those with severe allergies or respiratory issues. The type you choose will depend on your specific needs and budget.