The Trane XL15i air conditioner has a SEER of 16.50 (this is the
percentage of cooling that the device accomplishes, compared to the
energy input it requires). Cooling capacities range from 18,000 to
60,000 BTU/h.
In the range of Trane products, the XL15i falls between
the XL16i and the XR15 in terms of cost and efficiency. Trane describes
this model as particularly quiet and notes that it also comes with an
indoor air filtration system.
The XL15i uses R-410A (more commonly known as Puron)
refrigerant. This is a newer type of refrigerant, replacing Freon, which
has proven damaging to the ozone layer.