What furnace is better, Lennox or Trane, is very close because both are premium brands with excellent reliability, but Trane is slightly better for durability and fewer repairs, while Lennox is slightly better for efficiency and quiet operation. Trane furnaces like S9V2, S9X2, and XC95m are known for heavy-duty heat exchangers, robust cabinets, and excellent build quality, with first-year service call rates around 8 to 10 percent according to HVAC dealer surveys, and feature ComfortLink II communicating technology and variable speed blower that is very reliable, lasting 18 to 22 years. Trane offers lifetime heat exchanger warranty on many models. Lennox furnaces like EL296V, SLP99V, and ML296V are known for highest efficiency up to 99 percent AFUE for SLP99V, which is the most efficient gas furnace in US, and extremely quiet operation at 66 decibels due to SilentComfort technology, with service rates around 9 to 12 percent. Lennox parts can be more expensive and proprietary. Both cost 4,500 to 8,000 dollars installed. If you want most durable with lowest repair rate and strongest warranty support, Trane is slightly better. If you want absolute highest efficiency and quietest operation to save gas bill, Lennox SLP99V is better. For most homeowners, Trane is considered slightly better overall due to easier service and parts availability.
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