How do you turn the water cold and not hot?!

Question:

How do you turn the water cold and not hot?

how can you keep the water sold and not hot because i dont know how you guys can do that i dont get it when you guys say that you should make the water colder.

Additional Details

5 months ago
like the waters for the bettas and the gupies...

Answers:

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5 months ago
like the waters for the bettas and the gupies...

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I do not understand this question.
Can you rephrase it.

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turn off water heater in aquarium, keep filter running, in other words you dont make it cooler just dont let it get hot

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