Check air filters at least once a month and change as needed.
We recommend using filters with MERV ratings of six to eight. Unless the system was designed for higher MERV ratings, it is recommended that an HVAC professional who is NATE-certified should be used to verify that the air flow does not restrict the performance of the system.
Heating and cooling professionals recommend turning your system off before changing the air filter. Make sure that the arrow on the filter - which indicates the direction of the airflow - is pointing toward the blower motor. Once you’ve made the change, turn your system back on.