Trane has been an innovative leader in the home comfort industry for decades. The company manufactures a number of efficient central air conditioners that are perfect for today's Heating Ventilation and Air Conditioning (HVAC) systems. The units are designed for exterior installations and feature a corrosion-resistant housing that provides years of durable service. A compressor and refrigerant power the units, and the particular size depends on climate and a home’s square footage. The Seasonal Energy Efficiency Ratio (SEER) is the rating system that is used to compare individual units. Trane products have various SEERs to ensure consumers have plenty of options.