Trane sells 13 lines of air conditioners in various sizes besides two-ton models, which have an equivalent capacity of 24,000 British thermal units. Trane models typically offer a range from 17,000 to 60,000 BTU; this is equivalent to a capacity range of 1.5 to 5 tons.
The gradients between unit capacities in a line are typically either 6,000 BTU, equal to 0.5 tons or 12,000 BTU, or 1 ton. Not all Trane air conditioner lines offer all capacities; the XL201, for example, is only available in 24,000, 36,000, 48,000 and 60,000 BTU models. In contrast, the XB300 comes in seven different capacity configurations: 18,000, 24,000, 30,000, 36,000, 42,000, 48,000 and 60,000. This is equivalent to a capacity range of 1.5 to 5 tons.
Trane air conditioning units, which vary in efficiency and cooling capacity, range from the inexpensive XB300 to the expensive XV20i model. Of the 13 models, all but the XB300 are Energy Star rated units. The seasonal energy efficiency rating of the lines vary with price; less expensive models have a SEER closer to 13 while more expensive models exceed a SEER of 21. Likewise, the operational noise levels are between 55 and 82, with the XV20i, one of the industry's most efficient air conditioners, featuring a 55 decibel fan motor.