Should I Be Using the Auto Function on My Thermostat?

Wondering if the auto setting on your thermostat is best? Learn the pros and cons from Cavinder, your Granger and South Bend HVAC experts

What Does the Auto Setting on Your Thermostat Actually Do?

If you're like most homeowners in Northern Indiana, you might have glanced at your thermostat and wondered what the "Auto" setting really does, and whether you should be using it. At Cavinder Plumbing, Heating and Cooling, we get this question a lot from customers in Granger, Mishawaka, South Bend, and Elkhart.

Let's break down what the auto function is, when to use it, and how it affects your comfort and energy bills.

Understanding Thermostat Modes: Auto vs. On

Before we get into the pros and cons, it helps to understand the difference between the two most common settings:

• Auto: The fan runs only when the heating or cooling system is actively working to reach your set temperature.
• On: The fan runs continuously, even when your system isn't heating or cooling.

Benefits of Using the Auto Function

1. Improved Energy Efficiency
Using the Auto setting means your fan only runs when necessary. This can significantly reduce electricity usage, especially during mild seasons when your system cycles on and off less frequently.
Pro Tip: For energy-conscious homeowners in South Bend and Granger, the Auto mode is usually the best choice to lower monthly utility bills.

2. Less Wear and Tear on Your HVAC System
Continuous fan operation (using the "On" setting) puts more strain on your blower motor and air handler. Using Auto helps prolong the life of your system and reduces the need for costly repairs.

3. Quieter Operation
The Auto setting reduces background noise, since your fan isn't constantly running. This can be a big plus for families in quieter neighborhoods of Elkhart or Mishawaka looking to reduce household noise.

4. Balanced Humidity Control
In cooling mode, the Auto setting allows moisture to drain properly between cycles. Continuous fan operation can blow moisture back into the air, raising indoor humidity levels, especially in our humid Indiana summers.

Potential Drawbacks of the Auto Setting

1. Less Even Temperature Distribution
Since the fan shuts off between heating or cooling cycles, some rooms may feel warmer or cooler than others, especially in multi-story homes.
Solution: If you're experiencing hot or cold spots, Cavinder can assess whether a zoned HVAC system or ductwork balancing is right for your home.

2. More Frequent On-Off Cycling
Your system may cycle on and off more frequently in Auto mode. While this isn't harmful with a well-maintained unit, it can become annoying in homes with inconsistent insulation or drafty windows.

When Should You Use the "On" Setting?

While Auto is ideal for everyday use, there are times when switching to "On" might be helpful:

• Allergy season: Running the fan continuously can improve indoor air circulation and filter airborne particles.
• Evening out temps: If one area of your home is always warmer or cooler, keeping the fan on can help distribute air more evenly.
• Post-service cleaning: After HVAC maintenance, the On setting can help flush remaining dust through your filters.

Just remember: continuous fan use means higher energy costs and more frequent air filter changes.

Our Local Recommendation for Northern Indiana Homes

Given our region's extreme seasonal changes, fluctuating humidity, and varying home layouts, we recommend using the Auto setting as your default. It strikes the best balance between comfort, energy savings, and system longevity.

Need better air circulation or more consistent temps? Talk to Cavinder about adding zoning controls, a whole-home humidifier, or smart thermostat options tailored to your needs.

Let Cavinder Help You Maximize Comfort and Efficiency

Not sure if your thermostat is set up correctly? Curious about upgrading to a smart system that automatically adjusts for you?

Cavinder Plumbing, Heating and Cooling is here to help. As the Northern Indiana heating and cooling experts, we've helped families across Granger, South Bend, Mishawaka, and Elkhart get the most out of their HVAC systems.

Contact us today for a thermostat check-up, smart system upgrade, or a full home comfort evaluation!