Generally, you should set your AC to AUTO for better energy efficiency.
Here's a more detailed breakdown:
Understanding the Difference
- AUTO Mode: In AUTO mode, the AC fan only runs when the unit is actively cooling. It cycles on and off with the compressor.
- FAN Mode: In FAN mode, the AC fan runs continuously, even when the compressor is not cooling the air.
Why AUTO is More Energy Efficient
- Reduced Energy Consumption: The primary reason AUTO is more efficient is that the fan isn't constantly running. Since the fan only operates when the air is being actively cooled, it consumes less electricity. The reference estimates potential savings of up to $50 per month by using AUTO.
- Effective Cooling: The fan's main purpose is to circulate cooled air. When the compressor isn't running, the fan is just circulating room-temperature air, which doesn't contribute to cooling.
When FAN Mode Might Be Useful (However, Consider the Drawbacks)
- Improved Air Circulation: If you want to circulate air within your home without necessarily cooling it (e.g., on a mild day), FAN mode might be useful.
- Even Temperature Distribution: Some people believe FAN mode helps distribute temperature more evenly. However, this benefit is often marginal and outweighed by the increased energy consumption.
Drawbacks of Using Fan Mode
- Increased Energy Bills: The fan consumes power even when it's not cooling, leading to higher electricity bills.
- Potential for Reduced Cooling Efficiency: Continuously running the fan can actually decrease cooling efficiency because it might blow warm air across the cooling coils, hindering the cooling process.
Recommendation
For optimal energy savings and effective cooling, keep your AC on AUTO. Only use FAN mode strategically and sparingly.
