Well, I purchased my attic fan today. I went with the smallest fan it states it is for 1600 sq ft attics. I am not sure why they do not go by cubic feet. My equipment room is about 220 sq ft. It was $54.95 and if it does not cool well I could add another I guess.
I need to get a larger ladder because I am a wimp and am afraid I will not be able to get back off the roof.
Also, it was hot today.