Is your furnace always running? When it is really cold outside your furnace will be running more but it should not be running non stop. If it is running non stop there can be various issues with your furnace that need to be addressed.The furnace running constantly can cause excess wear and tear on the motor which can cause it to go bad earlier than normal so make sure you get it fixed right away. Here are some common reasons the furnace might be running constantly. Air flow can be restricted by the ducts that are inadequate, leaking, or damaged. Air flow can also be restricted due to dirty filters. Make sure your thermostat is set on auto so it controls it adequately. If you have it on the on position it will run constantly. Your thermostat can also be faulty which can cause the furnace to run constantly. Check to make sure the thermostat is working correctly. If you have the internal setting set to low it will make the furnace run constantly and wear down your motor. If your furnace is undersized for your home it will run longer to keep up with the demand of the thermostat. Closing too many vents affects the running cycle of the furnace so you want to make sure that you have more open than closed vents. Other things that can be wrong are clogged blowers, blowers that need lubrication, or just pure old age will cause the furnace to run non stop in the cold. These are some of the reasons that your furnace is running constantly. It is recommended that you have a qualified professional like the ones at Bartlett Heating and Air clean and repair your furnace because of the injury hazard that comes with it. Call Bartlett Heating and Air today to have us come out and repair your furnace.