This AC unit was nice at the beginning for our 970sqft condo, but we've had it for 2.5 years and the salt water has started to corrode the outside fins. The installer thought it was weird that there wasn't a drain plug or any discussion in the manual about having it drain. It now looks like this might be related to the corrosion issue. We're not sure how much more we'll be able to use this 18000 BTU unit, so a little disappointed in this unit.