How do you control the water temperature in the Aquaponics system?

In places with cool temperatures, water or tank heaters are used to control the water temperature in the fish tank. The size of the system defines the no. of heaters required. In warmer areas the tank or system should be planned in a shady place, the lid of the tank should be kept open and aerated. Cooling the water in warm locations needs extra electricity and is difficult. The choice of fish should be proper in such places.