However, for maximum efficiency and comfort:

1. Set Between 70°F to 75°F (21°C to 24°C): This range is generally considered ideal for cooling while ensuring the AC system operates efficiently.
2. Avoid Setting Below 60°F (16°C): Setting the temperature too low can overwork the AC system, potentially leading to decreased efficiency and increased fuel consumption.
3. Consider External What is the best temperatures: On extremely hot days, the AC may need to work harder, so it’s best to start at a lower setting (e.g., 65°F or 18°C) to cool the car down, and then adjust upwards as the interior cools.

Also, ensure that the recirculation mode is on in hot weather to cool the interior more quickly by circulating the cooler air within the car rather than pulling in hot air from outside.

The temperature limit for an air conditioning (AC) system generally refers to the minimum and maximum temperatures at which the system can operate effectively:

1. Minimum Temperature Limit:
   • Around 60°F (16°C): Most AC systems have a lower limit near 60°F. Setting the AC below this can lead to the evaporator coil freezing up, which can reduce efficiency or even damage the system over time.
2. Maximum Temperature Limit:
   • Around 100°F to 110°F (38°C to 43°C): While AC systems can still function in extreme heat, their efficiency decreases as outdoor temperatures rise above 100°F. In these conditions, the AC may struggle to maintain a significantly cooler temperature inside the car or building. Some high-performance systems are designed to operate in temperatures up to 120°F (49°C) or higher, but this is not typical for standard residential or vehicle AC systems.

Operating the AC within these temperature ranges ensures optimal performance and longevity of the system. Regular maintenance, such as cleaning filters and checking refrigerant levels, also helps the AC work efficiently within its limits.