 Be calling number 10 at 839-9950. 839-9950. Call number 10. You'll be playing along with us. Hey, as we roll through the first week here in the month of June, here's your friendly reminder to change your HVAC filters. If it's been a while, HVAC filters generally need to be replaced every one to three months, depending on how many people live in your home and the age of your HVAC system.