No, it is not more energy efficient to set the AC at a lower temperature than needed and turn it off instead of keeping it running at the desired temperature. This approach can actually waste energy and result in higher energy consumption.
Air conditioners work by removing heat from the indoor space and cooling it to the desired temperature. They operate most efficiently when running continuously and maintaining a consistent temperature. When you lower the temperature setting excessively or turn off the AC, the cooling system has to work harder to cool the space again when you turn it back on.
When you set the AC at a lower temperature, it doesn't cool the space faster; it simply runs longer to reach that lower temperature. It leads to extended operation, wasting energy and increasing the overall energy consumption.
To optimize energy efficiency and save on cooling costs, it is recommended to set the AC at the desired temperature and let it run consistently. Using programmable thermostats or timers can help adjust the temperature according to your needs, reducing energy consumption when you are away or during periods of less activity. Additionally, ensuring proper insulation, minimizing air leaks, and using fans to enhance air circulation can also contribute to energy savings and efficient cooling.