Ideal for replacement, Foundation rooftop units with capacities up to 25 tons fit a wide range of commercial buildings and fit both Trane and non-Trane footprints – without the need for curb adaptors to save time and money. The basics done right – simply designed, highly dependable, great value. 3 - 5 Tons / 7.5 - 12.5 Ton / 15 - 25 Tons.