Having furnace maintenance tasks performed regularly can not only ensure that you and your family remain comfortable in the winters, but it will also allow you better plan your energy budget, and to identify potential problems early, before the need for an expensive furnace replacement arises. If more than one year has passed since your furnace was inspected, it is time to get it done. If you smell gas leaking, notice water pooling around the base of your furnace or hear strange noises coming from the unit, call a professional immediately. A furnace that starts blowing cold air or is constantly cycling on and off is another sign you need to contact professionals for furnace maintenance. Other signs that a furnace repair might be needed include a malfunctioning thermostat, lower airflow from heating vents or a sudden, drastic increase in your utility bills.