It's 18k btu, or 1.5 ton. My square footage that I heat/cool is about 900 with 12 ft ceiling height. The challenges were the pole building having main poles at 8.5 ft. I added posts between all those when I insulated to reduce the width for standard pole barn insulation of 60". This still required a 1x12x74" backer board to be added for the evap unit to mount to. It's only 20 lbs, but at 10 ft up, it would be difficult on a ladder. I have my old fork lift and a pallet to use as a platform. The outside plumbing to the condenser needed 1x4 blocks under them because of the siding ribs. The cover is a dress up kit and the pieces are only 4 ft, so it took a while to get it all lined up and screwed down halfway straight. Measuring and planning the location of the condenser for the pre cut and flared lines was critical too. It runs on 240 volt, so I had to run a new circuit from the other side of the building for it. None of this is especially difficult but it was very time consuming. I worked on this for 4 days, but I'm old, slow and retired...