Choosing between the “auto” and “on” settings on an HVAC’s system blower may not seem like a big deal but it can have a large impact on your comfort, indoor air quality and efficiency. Keep reading for tips on when the fan setting “auto” or “on” are right for you.
“On” vs “Auto” Fan Setting
HVAC systems generate conditioned air by blowing air through coils that are heated or cooled. When you switch your blower to “on,” this means the fan will blow air continuously, even when the heating or cooling coils in your HVAC system aren’t activated. On the other hand, setting the fan to “auto” means it will turn on automatically when your HVAC system is blowing conditioned air. Once the room reaches the desired temperature, the fan will shut off until the next heating or cooling cycle.
Setting the Thermostat to “On”
When the fan is set to “on,” the blower operates continuously even when the heating or cooling equipment cycles off. 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. However, it this method does have a few drawbacks that may impact your pocket book. When it runs nonstop, the fan consumes more energy, and the air filter needs frequent replacement.
Setting the Thermostat to “Auto”
When the fan is on “auto,” it cycles on and off in tandem with the HVAC equipment. Leaving it on this setting throughout the summer makes the cooling equipment’s job easier, since it doesn’t have to overcome re-circulated heat and humidity during every cycle. This helps prevent unnecessary energy consumption along with extra strain and wear on the air conditioner.
One potential drawback of using the “auto” fan setting is that the living space can start to feel stuffy and warm in between A/C cycles. If you’re concerned about enhancing comfort, air quality and energy savings, consider a variable-speed air handler when it’s time to upgrade your cooling equipment. Even with the fan on “auto,” variable-speed units run nonstop on low, so they can efficiently keep the temperature consistent as well as boost filtration and humidity control. Another drawback is the wear on the blower motor and the potential need for an additional dehumidifier during the summer months.
If you have questions about your thermostat, call H.J. Faust Heating and Air Conditioning. We want to help you get in control of your comfort!
