No need for a chiller. Only pump + fans. It works in any climate as far as I know.
This is locale dependent. Can't be otherwise. Simple Thermodynamics.
But it can be otherwise. There are novec fluids that boil at a wide range of temperatures.
And ? What do you do eventually with the residual heat ?
(after all the boiling, transferring and paying for 3M fluids)
Not sure what you mean. Are you saying the ambient air temp will not be cool enough?
BTW in tests they were able to cool 4KW with 0.2 liters ($50/liter).