The lifespan of an air filter depends on a variety of factors, including filter type, size, and usage. The most common types of air filters in most homes can be expected to last approximately three months before they need to be replaced. However, that number can go up or down depending on the conditions. For example, HEPA filters, such as those in the Amaircare 3000, can last up to 5 years under the right conditions, although 2-3 is more realistic in spaces with large amounts of particles in the air.
Carbon filters usually have a lifespan of 3 to 5 years. Fiberglass air filters are the more affordable of the two, but less efficient at capturing dust and particles in the air. They usually need to be changed every 30 days or less. A general rule of thumb for pleated air filters (such as those manufactured by FilterBuy) is to replace the filter every 90 days. As the filter traps more dirt, dust and allergens from the air, the efficiency of the filter decreases.
If you're a pet owner, you'll want to change the air filter every 2 months, especially when winter turns to spring and summer to fall. In smaller homes, the HVAC system has to move less air, which can mean less frequent air filter replacements. For example, a family of four will need to change their air filters more often than a single person's home. If you can't tell by looking, but it's been more than three years or 30,000 miles, you should probably buy a new one (especially if you can save money doing it yourself). However, you should be careful if every time you change the oil, the repair shop says you also need a new air filter.
We expect drivers in most cases to spend more than a year, at least, and probably more than two years between air filter changes, depending on conditions and mileage. In any case, it is a smart and proactive policy to inspect at least the air filter every 6,000 miles (9,656 kilometers). After a period of smoky days with poor outdoor air quality, inspect the air filter to see if it needs to be replaced. However, if replacing the air filter is simply not possible for an extended period, going beyond 90 days will not cause irreparable damage to your air conditioning system. Not replacing the air filter accordingly can cause the homeowner's energy bill to rise, as clogged filters cause the system to work harder when air circulates. Find out below if you should replace the filter more often.
Replacing filters regularly can keep homeowners and their families healthy through efficient air circulation. Others say it's a bit excessive and that you should simply use your judgment to visually check the air filter and change it when it looks dirty. All the air that circulates through your HVAC system, whether for heating or cooling your home, will eventually pass through the air filter. If you find black areas in the section where outside air enters, it may be time to change it.