Currently is is a mixed workshop/store/laundry/gym with all the kit that would entail.
What was the garage window and back door is still there - original wood frames and showing their age a bit! The main garage door has been replaced with a cheapish slider. It is a big open space - think two decent sized single garages side by side.
We do have a dehumidifier which works quite well, but would prefer a cheaper "always on" solution to keep the must, slight damp and collected odor of all the stored paint, garden stuff and miscellaneous at bay.
Eventually (money permitting) we are going to put in internal stairs to the main house and do the whole thing up. UNtil then I was looking for an effective vent solution.