Moving a betta fish from cold water to heated water?

Betta naturally live in tropical countries like Thailand. The water temp there NEVER drops below about 20C, and it's usually higher. So this is what the fish expect, and NEED to survive.

Now some people do keep them without a heater, but that's because they are in a centrally heated house that never drops much below 20C no matter what. Water temp should be 25-28C. If the water gets too cool, the fish will become lethargic and stop eating.

They can survive like this for a while, but eventually they give up and die. A desk lamp may help keep it alive a bit longer, but it's not a god solution.

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