HVAC filters are an important part of your HVAC system, as they help to keep pollutants out of the air. Making sure that your HVAC filter is changed on a regular basis will ensure optimum air quality, improve HVAC performance, and protect your HVAC system from damage or breakdown. The frequency at which you should replace your HVAC filter depends on the specific model of HVAC unit, type of HVAC filter and other factors like pet presence in your home. Generally speaking, it is recommended that HVAC filters be replaced every 1-3 months as standard practice. This schedule may need to be adjusted based on personal needs; for instance, pet owners may need to change their HVAC filter more frequently than households without pets due to the increased amount of dander in the air. Regardless of individual factors, it's best practice to check your HVAC filters regularly and make replacement decisions accordingly.