How Often Should I change My Air Filter? Here's What to Know

If you’ve ever had your furnace fail in the dead of winter—or your air conditioner kick out on you in the sweltering heat of summer—you know that indoor comfort does not come cheap. The cost to repair or replace an old unit is steep, a new window AC can be difficult to replace, and portable air conditioners aren’t too wallet-friendly either. Your safest bet is to take the steps now to make sure yours has a long and happy life. First step?