The main energy saving options to reduce utility bills during the summer are focused on minimizing the refrigeration load. This can be easily achieved with no or low cost measures like avoiding unnecessary heat sources, using natural ventilation and fans rather than air conditioning equipment, keeping comfort temperatures close to 25°C etc.
In many cases it is worth replacing old air conditioning systems with energy efficient ones. Older space conditioning systems (more than 10 years old) are often unreliable and much less efficient than a modern system. Today's best air conditioners (A-rated) have higher initial costs than the lowest rated systems but can be up to 50% more efficient, thus they will repay you several times during their lifetime.
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