The power consumption of an air conditioner is primarily determined by its cooling capacity (tonnage) and energy efficiency rating (star rating). In general, a higher tonnage indicates a higher cooling capacity, while a higher star rating signifies greater energy efficiency.
To compare the power consumption between a 1.5-tonne 3-star AC and a 1-tonne 5-star AC, it's important to consider their respective energy efficiency ratios (EERs) or energy efficiency ratios (SEERs), which indicate how efficiently they convert electrical energy into cooling output.
While it is difficult to provide an exact comparison without specific EER or SEER values, it's generally safe to assume that a 5-star AC will consume less power than a 3-star AC for the same cooling capacity. A higher star rating indicates better energy efficiency, which means the 5-star AC will likely require less electricity to produce the same cooling effect as the 3-star AC.
However, it's important to note that the power consumption of an air conditioner can also be influenced by other factors such as the operating conditions, temperature settings, insulation of the room, and usage patterns. These factors can vary from one installation to another and may affect the overall energy consumption.
To make an accurate comparison and determine the exact power consumption difference between the two AC units, it's advisable to refer to the specific energy efficiency ratings provided by the manufacturers or consult the technical specifications of the respective models.