Hello. I'm building a recording studio (mostly for listening to and editing music) that is 1/2 underground (daylight basement) in Seattle. It will be very air tight when in use with all the doors are shut, except that I have a 600 cfm fan outdoors (in a weatherproof shed) that will circulate air in when the room is in use (the fan can be throttled down to a lower speed as well). Room is about 17' x 20' x 7.5' H. When the room is in use, it will generate plenty more than enough heat right away, and when not in use the hall door will be open to an area that has forced air heating during the cooler months here in Seattle. The smallest (non split system) AC unit I could find was a 1.5 ton, so I opted for circulating with a fan, which two other people in this area have done in their basement studios with success. Still, I'll have a need for some dehumidification, which I'd probably do when I'm not actively using the room.
I'm trying to decide if I should buy a standalone dehumidifer (used in the room), or a spot air conditioner -- some of which I understand want to be connected to ducting. The reason I'm looking at the AC unit is that in the summer months on really hot days, I could turn it on for a short amount of time and cool the room down.
My other question is: would heat generated by equipment evaporate moisture, and when the fan is on, help dehumidify the room? Since my fresh air is coming from the outside, I realize that whatever the humidity is outside would obviously be a big factor on the humidity in the room. Thanks!