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Sometimes, you can clean an HVAC filter rather than replace it. If you have a washable filter, also known as a permanent or semi-permanent HVAC filter, wash the filter once per month. However, if you have filters that are not labeled as washable, do not attempt to clean them and reuse them. Many HVAC filters are disposable, and you’ll need to buy a whole new filter to replace dirty disposable filters.

Even if you don’t have an exhaust, you can still use a carbon filter in line with a duct fan. This method is known as “scrubbing” because it cleans particles from the air and recirculates the air within your space. This method allows you to keep your enclosed garden space sealed from the outside environment.

As a general rule, HVAC air filters should be replaced every one to three months (or every 90 days). However, the ideal frequency depends on several factors, including the filter type and your home's environment. For instance, if you use thinner filters (1-2 inches deep), have pets, have household members with allergies, smoke indoors, or frequently keep windows open, you may need to change the filter as often as once a month. It's best to follow the manufacturer's recommendation as a guideline and visually inspect the filter monthly to see if it's dirty. Regular filter changes are crucial for maintaining proper airflow, good indoor air quality, and efficient HVAC system operation.

The lifespan of a whole-house air purifier or filtration system depends on several factors, but with proper maintenance, they are built to last. A whole-house system that integrates with your home's ductwork can last 10 to 15 years, or even for the entire lifetime of your existing HVAC system. To maximize the unit's lifespan, perform regular cleanings, change filters as recommended, and schedule an annual inspection to catch potential issues early. The system's longevity also depends on its frequency of use and how hard it must work to maintain your desired air quality. For comparison, smaller, portable air filter systems typically last between five and ten years.