Setting the air conditioner below 70 degrees Fahrenheit (21 degrees Celsius) is not necessarily "bad," but there are a few factors to consider:
Energy consumption: Lowering the temperature significantly increases the workload on the air conditioner. The unit has to work harder and consume more energy to maintain the lower temperature, leading to higher electricity bills.
Efficiency: Air conditioners operate most efficiently within a certain temperature range. When the temperature setting is too low, the air conditioner may struggle to achieve and maintain that temperature, leading to decreased efficiency. It may also result in rapid cycling of the unit, which can increase wear and tear on the system over time.
Comfort and humidity: Setting the air conditioner too low can result in excessively cold indoor temperatures, which may lead to discomfort for some individuals. Additionally, running the air conditioner at very low temperatures can remove moisture from the air too quickly, resulting in overly dry indoor conditions. This can cause issues such as dry skin, respiratory problems, and discomfort.
Environmental impact: Higher energy consumption associated with lower temperature settings contributes to increased greenhouse gas emissions, which can have a negative impact on the environment.
However, it's important to note that comfort preferences vary among individuals, and some may prefer lower temperatures for personal comfort reasons. It's generally recommended to set the air conditioner at a moderate temperature that balances energy efficiency, comfort, and humidity control.