I've been using a 25,000 BTU window unit in our smaller shop. It's a 40 x 60, but have a little over half of it partitioned off. It barely keeps up, but gave out last week. In the next year or so we plan on taking out the partition and it will be the full 40 x 60. I'm trying to decide if I should get another big window unit or look at a different option that will work for the 40 x 60 space. Ceiling is 14 ft. What would my other options be? Any experience?