Should Your AC Be on Auto or On? Here’s the Lowdown

Arjuna Lowther • November 20, 2024
an ac on auto

Ahhhhh, the age old philosophy conundrum: should your AC be on auto or on? Will “Auto” save you money? Will “On” keep your home cooler? Join Igloo AC and let’s break it together down so you can press that button with confidence.


Should Your AC be on Auto or On? Let’s Break it Down


Option 1: The Case for "Auto" (or the Set-It-and-Forget-It Approach)


We probably don’t need to explain what “auto” means to you…but guess what? We’re going to anyway (we’re nice like that): When you set your AC to "Auto," the fan turns on only when the AC is actively cooling. What
that means is that…once the room cools down, both the fan and the cooling system shut off until it’s time to bring the temp back down again. Make sense? It basically only gives you what you need.


Option 2: The Case for "On" (a.k.a. Consistency Is Key)


Setting your AC to “On” means the fan is always running, even when the cooling system isn’t actively chilling the air. The fan keeps air circulating, which means that the temperature across the room stays more consistent.


The downside?
It’s a little (sometime a lot) heavier on your energy bill. Running the fan constantly uses more electricity, and that can lead to some unwelcome surprises when your bill arrives. Also, the constant fan action can actually put a bit of extra wear on your AC system over time—more hours of fan time mean more chances for parts to wear out. 


Best for:
If you prioritize consistent temperatures and airflow, or if you’re in a space with a lot of foot traffic and different comfort preferences.


Option 3: Is There a Happy Medium?


Should your AC be on auto or on? Well, if you’re the Goldilocks type—searching for that “just right” solution—consider a compromise. You can switch between “Auto” and “On” depending on your needs. Here’s how it works:

  • Daytime or when you have guests over: Set the AC to “On” for steady airflow and an even temperature throughout the space.
  • Nighttime or when you’re out: Switch it to “Auto” to save on energy and keep the humidity under control.

This hybrid approach means you get the benefits of both settings when you need them. And as a bonus? It can help extend the life of your AC unit by reducing constant strain on the system.


Igloo AC’s
Pro Tip: Think About Your Climate and Usage


Well, what’s the verdict?! Should your AC be on auto or on? When in doubt, ask the pros. Igloo AC, the experts in keeping Hawaii cool, suggest thinking about the climate and your space’s unique needs. Living in a humid area? “Auto” will be your ally. Constantly battling temperature hot spots or running a busy household? Then “On” is worth a try.


The key here is to understand what you want from your AC system—whether it’s energy efficiency, even temperatures, or humidity control. The answer lies in knowing what your priority is (and maybe
calling up Igloo AC for a little advice if you’re still unsure).




an ac on or auto
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