Cons to Continuous Fan Setting. Another reason to run the bath fan is if it's part of your whole-house ventilation system. These fan systems were designed to run all the time and, assuming your system is properly installed with the correct size ductwork, it may even extend the life of the fan. If your furnace fan is still blowing, continue onto step 2… 2. A fan that runs continuously typically means there’s a bigger issue. It is much easier on the motor to run constantly than to start and stop all the time. While it can be more energy efficient at times, the constant running could cost you hundreds of dollars more every year. Much of a furnace fan’s wear and tear comes from the starts and stops of the motor; keeping it running can eliminate this type of stress. By putting your thermostat to “fan on” mode will help even out the temperatures by pulling some of the hot air back down the stairs while simultaneously pushing some of the cooler, lower-level air through the ductwork and to the upper floors. If you have an older, less efficient furnace, it could be cost-prohibitive to keep the fan running all the time. The most stressful part of any motor’s life is that when it starts. In the “On” position, the fan will run continuously. If your fan is set to ON, it will run continuously, regardless of whether your furnace is heating or not. Before we begin, it’s important to have a … Malfunctions with this relay are known to make a fan run continuously. Pros to Running the Fan on “Auto” Energy Savings. In the “Auto” position, the fan should cycle on only when there is a call for cooling. Thermostat "Fan" Switch. Either way, if the bath fan is part of your whole-house ventilation, you don't want to turn it off in winter. A homeowner who has a 500-watt fan could be hiking up their energy bill around 50 more dollars a month. Modern ceiling fans have a sealed bearings in their motors which, although they will eventually fail, can allow the fan to turn for years. If your heat pump fan runs continuously, a bad relay switch is a possible cause. There’s no reason why the fan should run for hours on end. You can get controls to run them continuously or a certain number of minutes per hour. The most common cause of this problem is the “Fan” switch on the thermostat. You’ll need to reset it to AUTO to allow for proper fan operation (see pic below for instructions). There are also downsides to keeping your HVAC fan on the continuous setting. If the “switch on” temperature is set too low, you can bet that the fan will run all summer long and create a noisy disturbance. Some fans have the controls built in. However, if the fan runs by itself for more than a couple minutes, then you know there’s an issue. Source. On the other hand, if you notice that your furnace is still running after it reached your desired temperature, it means the furnace is not getting the message that it’s already accomplished its goal. It normally has two options – “Auto” and “On”. This can also happen when certain parts in your furnace is broken or damaged. if you use it for gaming software like steam or roblox they will make you fan run and steam is almost always updating your computer might have been hacked and someone is using it for bit coin mining. If your attic fan seems to be constantly running, it would be a good idea to bring in a professional to check it out and make sure it’s still working properly. Make sure your fan is set to AUTO and not ON. If the button is pressed in, the switch is set to Manual and is forcing the fan to run continuously. Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. 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