Lennox AC and Trane® AC Units: Who is the Best? Both offer huge selections of high-quality AC units. Both offer tailor-made AC units for multiple applications. Both provide units with exceptional SEER ratings. Both provide warranties and offer extended services plans through authorized dealers. Key Benefits of Lennox AC Units Units available to consumers are in three major categories including: The Dave Lennox Signature® Collection The Merit Series The Elite Series A total of seven (7) Energy Star rated units are available. SEER Energy Ratings for the Merit Series 13ACX Air Conditioning Unit is 13. SEER Energy Ratings for the Dave Lennox Signature® Collection XC21 AC Unit is 21.2. Warranties Provided by Lennox 10-year warranty on parts: compressor and limited lifetime warranty on the heat exchanger for Dave Lennox Signature Collection AC Units. The Elite Series offers a 5-year warranty plan on parts, 10-years for heat exchange and 20-years or ‘limited lifetime’ for other parts. The Merit Series warranty is similar to the Elite Series. Key Benefits of Trane® AC Units Trane® provides consumers with a selection of (8) residential air conditioning units. The units are classified by XL, XB or XR series. SEER Energy Ratings for the XB300 Series Air Conditioning Unit is 13. SEER Energy Ratings for in the XL20i Air Conditioning Unit is 20. Warranties Provided by Trane® Trane® offers a 60-day limited warranty on all Air Conditioning Units which covers any manufactures defects on parts for a total of 10 years. Warranty Coverage includes both the coil and compressor but does not cover standard wear and tear of parts. Requires the unit be registered via phone or online. Cost of installation and other materials are not covered