The energy efficiency of keeping your air conditioner on continuously versus turning it on and off manually depends on various factors, including the climate, the size and efficiency of the air conditioner, and the thermal characteristics of the building.
In most cases, it is more energy-efficient to turn off the air conditioner when it's not needed, rather than leaving it running continuously. Here's why:
Constant running: If the air conditioner runs continuously, it keeps cooling the space even when the desired temperature is reached. This can lead to overcooling and waste energy.
Startup surge: When you turn on an air conditioner, it requires an initial surge of power to start the compressor and cooling process. This startup surge consumes more energy compared to the steady-state operation. If you turn the air conditioner on and off frequently, these startup surges can add up and reduce efficiency.
Thermostat optimization: Air conditioners work to maintain a set temperature as indicated by the thermostat. When the room temperature rises above the set point, the air conditioner turns on and cools the space until the desired temperature is reached. Once the temperature is achieved, the air conditioner turns off. This cycle repeats as needed. When you manually turn the air conditioner on and off, you lose the advantage of this thermostat optimization.
In most situations, it's recommended to use a programmable or smart thermostat to control your air conditioner. This allows you to set temperature schedules that match your daily routines, so the air conditioner turns on and off automatically at appropriate times. This way, you can enjoy a comfortable environment while minimizing energy waste.
However, there can be some exceptions, such as in extremely hot and humid climates where the air conditioner might struggle to cool down the space if turned off for extended periods. In such cases, it's still generally better to use a programmable thermostat rather than running the air conditioner continuously.
Remember, proper insulation, sealing of windows and doors, and regular maintenance of the air conditioning system can also significantly impact its efficiency. Consulting with a local HVAC professional can help you optimize your cooling system for energy efficiency in your specific climate and building conditions.