Yes, as a general rule, you can leave your AC on auto, and doing so can often save you money.
Here's why:
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Energy Savings: When your AC is on "auto," the fan only runs when the unit is actively cooling. This means it's not constantly blowing air, which consumes electricity.
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Reduced Utility Bills: Less energy consumption translates directly into lower utility bills.
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Consistent Temperature: The "auto" setting helps maintain a more consistent temperature because the AC cycles on and off as needed to reach the setpoint.
How It Works:
When you set your AC to "auto," the system only activates the fan when the cooling process begins. Once the desired temperature is reached, both the compressor and the fan shut off. They will remain off until the temperature rises again, triggering the cooling cycle to restart.
When "On" Might Be Preferable:
While "auto" is often the most efficient choice, there are a few situations where running the fan "on" might be beneficial:
- Improved Air Circulation: If you have rooms that tend to be stuffy or unevenly heated/cooled, running the fan continuously can help improve air circulation throughout your home.
- Air Filtration: If you're using a high-quality air filter, running the fan constantly can help remove more dust, pollen, and other allergens from the air. However, consider the added energy cost.
Potential Drawbacks of "On":
- Increased Energy Consumption: Running the fan constantly consumes more energy, which can increase your utility bills.
- Potential for Moisture Issues: In humid climates, running the fan constantly can sometimes pull moisture from the cooled coils back into the room, potentially increasing humidity levels.
Conclusion:
Using the "auto" setting on your AC is generally the most energy-efficient option for most households. It allows the fan to run only when needed for cooling, minimizing energy consumption and lowering utility bills. However, consider your specific needs and circumstances, such as air circulation or air filtration, when making your decision.
