The answer to 'which is better variable speed or single speed AC' is that variable speed air conditioners are generally considered better than single-speed models. Variable speed ACs provide more precise temperature control, improved energy efficiency, and quieter operation compared to single-stage systems.
Variable speed compressors can adjust their output to match the cooling demand, running at lower speeds most of the time to maintain a consistent temperature. This results in lower energy usage and utility bills. Single-stage ACs run at full capacity regardless of the cooling needs, leading to more temperature fluctuations and higher energy consumption.