air conditioning tuscaloosa, alPackage units are perfect for climates with hot summers and mild winters, just like here in Alabama. Trane packaged heating and cooling systems put efficiency and economy in one self-contained unit. In a packaged system, all equipment is built into an outdoor unit, usually on a concrete slab or other platform. It is a  package because heating and cooling co-exist  but also that it provides both air conditioning in spring and summer with heat in autumn and winter.