08/02/2024
We service some customers that believe that the air filter in their heating & cooling system will help to rid their house of dust. The furnace blower and its' air filter are not designed to help keep your house clean. It certainly will never pick up dust off of your coffee table and circulate that dust through the air filter. The ONLY job for the air filter is to protect and keep clean the furnace and evaporator coil, that usually sets on top of the furnace. It is only for protecting the system. We don't ever recommend using an air filter with a "MERV" rating above 8. MERV is an efficiency rating on air filters. Any filter with a rating over 8 is too restrictive for airflow through your furnace. 3M and others are very good at marketing higher MERV rated filters, but they are not good, in my opinion, for your heating and cooling system. Air filters are way cheaper than a service call. Keep them changed regularly.
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