The best mini air cooler is the Honeywell MO08CESWK Compact Portable Air Conditioner. It is one of the smallest portable air conditioners in this review.
Due to its light weight and small size, it is very easy to transport. It also has a high BTU rating enough to cool a room of up to 450 sq.ft. Most importantly, it has top-of-the-line features and overall construction.