Should I Set My Thermostat Fan to “ON” or “AUTO”?
What does fan AUTO mean on the thermostat? To answer this question, it's important to consider that we have our energy costs in our hands. Let's dig into your thermostat settings and decide which is more cost effective.
Benefits of the "ON" Setting
Many homeowners choose the ON setting because it helps keep an even temperature. Constant circulation also makes air filtration better.
So, what does it really mean?
- Even distribution of heat or cold;
- Improved filtration, good for allergy sufferers;
- Constant white noise—some people really like it.
If you want to maintain clean air longer, ON mode may be a good solution.
Disadvantages of the “ON” Fan Setting
There are disadvantages to this mode. Constant fan operation increases the load on the system and increases the electricity bill. In addition, the filters become dirty faster. So, fans of this mode, get ready to change them more often.
But what does AUTO mean on thermostat? Let’s figure it out how to choose thermostat AUTO or fan ON wisely.
Benefits of the "AUTO" Setting
Now let's see what does AUTO mean on the thermostat in terms of benefits. This mode reduces costs. Why? Because the fan is only switched on when the system is actually working. It adapts to the context of what is happening and therefore wears out more slowly.
The combination of HVAC checks and proper installation, AUTO mode helps keep an optimal balance between comfort and savings.
Disadvantages of Using the “AUTO” Setting
Despite the obvious advantages, the AUTO setting has disadvantages. What does fan AUTO mean on thermostat in the context of cons? Sometimes the temperature is not evenly distributed and different rooms may have different comfort levels. Also, the quality of air filtration is lower if we compare the thermostat AUTO or fan ON setting.
Which Setting Should You Choose?
Many people ask themselves: thermostat AUTO or fan ON—which should you choose? It all depends on your priorities. If you want to save on bills as much as possible and extend the life of the equipment, it's best to turn on AUTO. By the way, if you want to install a new system and would rather save money on it, we suggest reading about the top ways to do it in 2025.
But if you have allergy sufferers at home, for example, and you want the cleanest air possible, don’t choose between AC AUTO or ON. The first option is better, but it's worth switching to ON from time to time.
How to Optimize Your Thermostat for Efficiency
Now, when we know what does AUTO mean on thermostat, let’s take a look at some tips to help you get the most out of your system:
- Change filters on time;
- Use smart devices: Honeywell thermostat AUTO vs ON (they are equally good for different purposes!), Nest, Ecobee;
- Don’t set extreme temperatures;
- Turn ON only when necessary.
Does Thermostat Brand Matter?
Yes, brand plays a role. Take a look, for example, at how our technicians at Fuse Service are committed to the Daikin brand: read about one of our study cases on AC system installation in Cupertino.
But let’s go back to thermostats. For example, Honeywell thermostat AUTO vs ON is easy to operate (in both modes!), Nest and Ecobee allow climate control via an app. This helps with automation and saves up to 20% on bills. What does AUTO mean on thermostat like that? Even more noticeable savings, obviously.
Common Myths About Thermostat Fan Settings
There are several myths:
- ON mode is always better comparing AC AUTO or ON.
- What does fan AUTO mean on the thermostat? That it worsens air quality.
- A smart thermostat is an unnecessary waste.
Want to properly adjust your thermostat and lower your energy bills? Contact Fuse Service or subscribe to our Instagram to get helpful tips on any home service!