I picked up an 8000 BTU in-wall (14.5" wide) air conditioner and I'm wondering if anyone has HVAC experience. I understand there will be condensation however I don't know if the back end of an air conditioner is a simple heatsink (passive) or if there is air blowing over it. The AC will be mounted in a room adjacent to empty/dead space so the back end of the AC will be inside that dead space area. I've sorted out the plumbing for the condensation drip - but I'm not sure if I need to install an exhaust fan or if it can just be passively cooled by the empty space. The empty space is about equal to the size of the room I'm cooling if that matters. Thx for any feedback and replies.