The answer to 'why is my mini split high energy bills' is that there are several common causes, including improper sizing, air leaks, and inefficient operation. Mini split systems that are not properly sized for the space they are cooling can use significantly more energy than necessary. Air leaks around the indoor and outdoor units can also lead to energy waste. Additionally, if the system is not maintained and operating efficiently, it will consume more electricity to provide the same cooling.
In many cases, addressing these issues can help reduce high energy bills. However, some problems may require the expertise of a professional HVAC technician to diagnose and resolve.