extractor fan in green house ???

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Hi guys recently purchased some new equipmeant  for this winter time to be installed in the loft once elctrics are sorted 1 x 1 x 2 grow tent a 600 wt philson led , duct carbon filter 6 inch and a 6 inch inline fan twin speed cable of around 520 cubic meters per second. Now at athe moment as you lot know im in the greenhouse.  I am wondering if t s worth running the said fan on a fan controller in the green house to help combat humidtiy ?? Its mainly in the evening were it jumps up to around 75 not ideal I know. How ever to help me with the cuase I do have a 10 inch oslating fan on the go and I have now set up my old oil fire keeping the temp stable at around 16.5 once the old current bun in the sky has set. Thanks for any help /input  folks