"ON" keeps the fan running continuously, which can help with air circulation and filtration but may consume more energy. Choose "AUTO" for energy savings and "ON" if you want constant air circulation or improved air filtration. Temperatures can soar or plummet depending on the time of year.
Keeping your fan on AUTO is the most energy-efficient option. The fan only runs when the system is on and not continuously. There is better dehumidification in your home during the summer months. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside.
Leaving your Air Conditioning Thermostat fan setting on RUN instead of AUTO will cause mold damages to your home and contents. It's nothing something that will happen overnight, but leaving the fan on for months, especially during the summer, will cause you to have mold problem.
Fan- the fan runs and can run constantly whether heating or cooling is needed. Reasons may be filtration, ventilation, humidification or general circulation. If this is your setting, coupled with ``Heat/Cool'', the heating burner or cooling condensing unit would start and stop as needed. Off- is just that.
When your thermostat is on the fan setting, it'll run continuously and cycle air. This uses more energy and shouldn't be your default choice. However, there are a few scenarios in which you should always use your thermostat's fan setting.
The best time to use fan mode is when you are already happy with the room's temperature and humidity levels, but want the comfort that comes with gently circulating air.
You can run your system's fan independently of heating or cooling. So your system doesn't need to be actively heating or cooling to run the fan. However, you can only run the fan when your thermostat is set to a temperature mode (like Cool mode, for example).
When it comes to whether you should set your furnace fan to “on” or to “auto” in winter, the answer for me is “auto” because it's the move that has the most to do with energy efficiency. It is not, however, the only thing you can do this winter to bolster your HVAC system's energy efficiency.
You'll want to have your thermostat set to heat mode in the wintertime and air conditioner auto mode in the summertime. In order for your system to run on auto mode, you'll need to have either the heat mode or cool mode on. This way, your thermostat knows whether to turn on the furnace or the air conditioner modes.
If the control board is faulty or malfunctions, it may not send the signal to the fan to tell it to shut off. The same can also happen if the wiring between the control board and the fan is damaged or there is a loose electrical connection.
Therefore, the fan uses about 360 kWh per month in the ON mode. The average kWh in the US costs about $0.12 so it costs about $43 per month, or about $520 per year, to run a fan continuously.
Your blower fan is powered by a motor, and this motor requires power (electricity) to run. If your thermostat is set to ON, it will run non-stop—even when it's not needed—which can raise your energy bill by as much as $8 per month (almost $100 a year).
As the refrigerant evaporates, it absorbs heat from the air passing over the coils. This cooled air is then circulated back into your home through a system of fans and ductwork. So while your AC unit does take in some amount of outdoor air, the vast majority of the air it's circulating is already inside your home.
Leaving the fan running reduces wear and tear on the motor since it's not starting and stopping repeatedly. It's also beneficial to boost filtration, but leaving it on this setting has more drawbacks than benefits. When it runs nonstop, the fan consumes more energy, and the air filter needs frequent replacement.
The circulating fan feature allows the fan to circulate air when the system is not running. A percentage is selected to indicate how often the fan should run each hour. The circulating fan feature can only be programmed at the thermostat in 5% increments from 10% - 100%.
Circulating the heat helps avoid having warmer or cooler spots throughout your home. Better Air Quality: Setting the fan to “on” also means the air will constantly cycle through your HVAC unit's filtration system. If the filter is changed regularly, fewer particulates will be in the air, further improving comfort.
"AUTO" is the more energy-efficient option, as it runs the fan only when heating or cooling is actively needed. "ON" keeps the fan running continuously, which can help with air circulation and filtration but may consume more energy.
Your thermostat fan setting controls your HVAC system's blower. The blower helps circulate cold or hot air throughout your home until the temperature reaches the thermostat setting. ON means that the fan is constantly blowing, even when the desired temperature has been reached.
Answer: You can— and should— run your A/C and ceiling fan together. Doing so can help lower your cooling costs each month, but only if you're using them right.
You don't want to cool the air down in Winter, rather you want to draw the air up. When running your fan in Winter, it is better to have it on a lower setting than you would use in Summer. You want to achieve a gentle mixing of the air, not a draft. The exception to this is if you have a large space or high ceilings.
Fans are used for circulating air in rooms and buildings; for cooling motors and transmissions; for cooling and drying people, materials, or products; for exhausting dust and noxious fumes; for conveying light materials; for forced draft in steam boilers; and in heating, ventilating, and air-conditioning systems.
In Fan mode, the system will run fans to cycle air throughout the home. However, it will not heat or cool air usually. Instead, air will just remain at room temperature. In some thermostat models, Fan mode will completely turn off heat or cool mode.
Advantages to switching to the Fan/On setting:
You can keep the temperature throughout your home more uniform by allowing the fan to keep generating airflow. Indoor air quality will be highest since constant airflow will keep forcing airborne contaminants into the air filter.
What is AC Fan Mode? Essentially, your air conditioner unit's fan mode controls the blower fan. You can choose to run the fan continuously or only when the AC is on. This setting helps circulate air in your home, but it won't produce any new cold air.