I have hands that wave you, though I never say goodbye. It's cool for you to be with me, especially when I say HI. What am I?

Common Wrong Answers
“A person”
While a person can wave and say hello, they are not typically described as having 'hands that wave' in a literal sense, making this answer less fitting for the riddle.
“A clock”
A clock has hands, but it doesn't 'wave' or say 'HI,' and it is not typically associated with being 'cool' in the same context as a fan.
“A waving flag”
Although a flag can wave, it does not have 'hands' and does not serve the cooling function implied in the riddle.
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