Alf and Arlo were in the kitchen, and Mother was out.

It was stifflingly hot, and Alf said, "It's too hot. I'm going to open the deepfreeze to cool us down a bit."
Arlo, his younger brother, said:"Yeah, good idea! But switch it off."
"There you are, Arlo," said Alf, "You admit that you were wrong when I opened the fridge door to cool us, and you said it would make us hotter."
Arlo replied, "No, I was right then, and I'm right now!"

Is Arlo right? Provide valid arguments for your answer.