Your air filters should be changed, or cleaned, in accordance with the manufacturer’s specifications on your HVAC system. Different systems have different air filters, and different air filters operate in different ways. Some air filters are disposable and need to be entirely replaced. Others are not and need the dust and dirt cleaned out of them. Some air filters don’t need to be changed or cleaned as often as others.
We recommend that you use the services of a trained HVAC professional to change or clean air filters. Doing it yourself is risky and could result in problems in the system if the replacement isn’t done correctly.