Group 1 - The article discusses the energy-saving strategies for air conditioning usage when leaving home for a short period, specifically comparing fixed-frequency and variable-frequency air conditioners [3][7]. - Fixed-frequency air conditioners consume a constant amount of energy, and it is more economical to turn them off when leaving for a few hours [3][5]. - Variable-frequency air conditioners are more efficient when left on for short periods, as they consume less energy during operation compared to the energy required to restart [3][7]. Group 2 - The lifespan of air conditioners is primarily determined by the compressor, and minimizing the frequency of on-off cycles can extend the life of fixed-frequency models [7]. - Variable-frequency air conditioners operate at lower power levels, which can help prolong their lifespan if not frequently turned off and on [7]. - Safety concerns are raised regarding leaving air conditioners running while away from home, particularly if the unit is old or improperly installed, which could lead to fire hazards [8][9].

Core Viewpoint - The article discusses the energy efficiency of air conditioning units, specifically comparing fixed-frequency and variable-frequency air conditioners, and provides recommendations on whether to turn off the air conditioner when leaving home for a short period. Group 1: Air Conditioner Types - Fixed-frequency air conditioners operate with a compressor that alternates between on and off states, leading to fluctuating power consumption [4][5] - Variable-frequency air conditioners have a compressor that adjusts its power output, resulting in a more stable and lower average power consumption [6][7] Group 2: Energy Saving Recommendations - For fixed-frequency air conditioners, it is recommended to turn them off when leaving for a short period to save on electricity costs [5] - For variable-frequency air conditioners, it is more energy-efficient to leave them running during short absences, as restarting them consumes more electricity [7][8] Group 3: Air Conditioner Lifespan - The lifespan of an air conditioner is primarily determined by the compressor's operation, with frequent on-off cycles negatively impacting its longevity [15][16] - To extend the lifespan of fixed-frequency air conditioners, it is advised to minimize usage when not necessary [16] - Variable-frequency air conditioners should not be frequently turned on and off to avoid wear from the initial high power consumption during startup [18] Group 4: Safety Considerations - Leaving an air conditioner running while away may pose safety risks, particularly if the unit is old or improperly installed, which could lead to fire hazards [22][23] - It is important to consider the condition of the air conditioner and potential risks before deciding to leave it running during extended absences [23]