There are several steps that can help you to save energy while using an air conditioner. The steps include;
Adjust the louvres on your split AC so it can emit the air downwards while heating and upwards while cooling. Clean the filter of your AC unit regularly. Use ceiling fans to help circulate the cold air properly throughout the room. Try to keep a professional maintenance schedule.
During summer, keep the windows properly shaded to keep the heat out as possible.