Trane XL1200 Specs Review and Price - thedailythrive Trane XL1200 is a split system home air conditioning and heat pump unit by Trane. It has efficiency of up to 13 SEER and 8 HSPF. The used to be at the higher end of efficiency back when the minimum legal installation was 10-SEER. Lennox Air Conditioner Reviews and Prices 2021 Lennox makes 11 central air conditioners in three series: Basic: Lennox Merit Series. 4 models, 13-17 SEER. Single-stage. Better: Lennox Elite Series. 4 models, 15.5-20 SEER, single-stage, two-stage and variable capacity. Best: Dave Lennox Signature Collection. 3 models, 18.5-26 SEER. Single-stage, two-stage and variable capacity. Here is a breakdown of the models and our recommendations.