We are having a new house built with three Trane 13 seer condenser units. These are arranged in a row and are 2 tons, 4 tons and 5 tons, with the 4 ton in the middle. The outdoor units were just installed and are located roughly 3 to 4 inches apart. This seems a tad close to me, especially for the middle 4 ton unit. I am curious what the minimum clearance recommended by Trane is and what the practial separation distance should be. I am going to try calling Trand tomorrow to see what they have to say. Any advice would be greatly appreciated. Thanks. George