Should I set my thermostat to AUTO?
Jul 19 , 2023 Comment

Your thermostat setting plays a significant role in the overall performance and efficiency of your HVAC system. One particular setting that often confuses homeowners is the fan setting, which on most models can be set to either “AUTO” or “ON.” Smart thermostats have more options, which we will explain more below. In this blog post, we will explore the advantages of leaving your thermostat fan setting to “AUTO” and why it is the recommended choice for optimal comfort, energy efficiency, and humidity control.

Why Set Your Thermostat to AUTO

Efficient Cooling Cycles: Setting your thermostat fan to “AUTO” ensures that the fan operates only during cooling cycles. When your AC unit actively blows cool air, the fan runs to distribute that air throughout your home. Once the desired temperature is reached and the cooling cycle ends, the fan automatically shuts off. This intermittent operation allows for energy-saving cooling cycles and prevents unnecessary energy consumption.

Conserves Energy: By utilizing the “AUTO” setting, you avoid continuous fan operation, which can lead to unnecessary energy usage. When the fan runs continuously in the “ON” setting, it consumes electricity even when the AC compressor is not actively cooling. By switching to “AUTO,” you optimize energy efficiency and reduce electricity consumption, ultimately lowering your energy bills.

Better Humidity Control: Humidity control is crucial for maintaining a comfortable indoor environment. The “AUTO” fan setting contributes to efficient humidity control by allowing your AC system to remove excess moisture from the air. During cooling cycles, when the fan runs, it assists in dehumidification. Once the cooling cycle ends and the fan shuts off, the remaining moisture condenses and drains away, reducing indoor humidity levels. This helps prevent mold growth, improves indoor air quality, and enhances overall comfort.

Noise Reduction: Constant fan operation in the “ON” setting can create unnecessary noise in your home. The intermittent operation of the fan in the “AUTO” setting provides quieter periods during which the fan is off, allowing for a more peaceful environment. This is especially beneficial during the night when you may prefer minimal disturbance for a good night’s sleep.

Extended Equipment Lifespan: Reducing wear and tear on your HVAC equipment is essential for its longevity. Continuous fan operation in the “ON” setting can put additional strain on the fan motor, potentially leading to premature wear and increased maintenance requirements. By selecting the “AUTO” setting, you ensure that the fan operates only when necessary, reducing the overall stress on the system and extending its lifespan.

Smart Thermostats vs. Standard Thermostats: Fan settings on smart thermostats and standard digital thermostats generally operate similarly, but smart thermostats offer additional features and control options. For instance, smart thermostats often come with advanced scheduling capabilities that allow you to set specific fan settings for different times of the day or days of the week. This flexibility allows you to customize the fan operation based on your preferences and lifestyle. It will default to auto unless you choose to change it to always-on or a customized schedule.


When it comes to choosing the appropriate fan setting on your thermostat, set your thermostat to AUTO. It proves to be the preferred option for numerous reasons. From energy efficiency and cost savings to improved humidity control and equipment longevity, setting your fan to “AUTO” provides a range of benefits. Embrace the advantages of this setting to enjoy optimal comfort, reduced energy consumption, and enhanced performance from your HVAC system. Having other thermostat issues and need professional help? Contact us to schedule service.


Leave a comment

Your email address will not be published. Required fields are marked *