Air handling products include central station air handlers, outdoor air handlers, custom air handlers, make-up air handlers, fans and coils.

http://www.trane.com/commercial/equipment/airhandling.aspx

Refrigeration products include centrifugal, rotary and scroll compressor chillers and absorption chillers, ranging in nominal capacities from 10 to 2,500 tons. Trane refrigeration products are used in both comfort and process applications.

http://www.trane.com/commercial/equipment/refrigeration.aspx

Unitary Products are generally products that do not require an engineered installation and include a host of factory commissioned heating / cooling systems or modules which can be assembled to provide specified performance in capacity, energy efficiency...etc.

http://www.trane.com/commercial/equipment/products.aspx