Question: how does lennox air conditioners rate?
Answer: Top Lennox air conditioners are extremely efficient. The XC25 with efficiency up to 26 SEER is easily the most efficient split system air conditioner available. The XC21 at 21 SEER is the most efficient two-stage AC, and the SL18XC1 at 18.5 SEER is the most efficient single-stage model available.