 Other factors to consider are any household pets, if anyone in the home smokes, or has any respiratory conditions. These circumstances may make it worthwhile to change your filter more often. Just one of the many helpful tips on the website carolinacool.com. Since 1985, the cats over at Carolina Cool, they've been your go-to provider for all your heating and air conditioning needs. They are your jack-of-all-trades and trusted local provider when it comes to HVAC,