The air filter in your heating and air conditioning system should be replace every 3 to 6 months depending on the type of filter and how much the furnace and air conditioner is used. A dirty or plugged air filter can reduce the efficiency of your system from 20% to 50%. A dirty or plugged air filter can also cause undue stress on your furnace and air conditioner, shortening the life of the system and increasing breakdowns. We offer CareFree maintenance agreements that take care of the service on your system and as an added benefit we call you when it is time for your service. You don’t have to remember to have it done.