Home > Home & Garden > Central Air Conditioners > Dave Lennox Signature XC25

Dave Lennox Signature XC25 Review

By: Carl Laron on May 24, 2017

Bottom Line

The Dave Lennox Signature XC25 is one of the most energy-efficient central air conditioner systems you can buy. With its maximum SEER of 26, it qualifies for inclusion on the Energy Star Most Efficient list for 2017. The Lennox brand is well regarded, but the warranty and customer service could be better.


  • Up to 26 SEER
  • Modulating compressor
  • Wireless, smartphone compatible control system
  • Solar-ready option


  • Expensive
  • Replacement parts can take a long time to arrive
Get 3 FREE Trade Estimates Now!
Our Analysis

Breaking it down


Top ratings. With its top SEER rating of 26, the Dave Lennox Signature XC25 is the most energy-efficient central air conditioner in this report and it earns Energy Star Most Efficient status for 2017. It can save as much as 60 percent in energy costs compared to an older system, experts say. That's important to keep in mind as you shop for systems as it can offset the initial cost of the XC25, which can cost substantially more than some competing systems. Part of the reason for that price premium is this system's advanced technology. The XC25 uses a modulating compressor that provides just the right amount of cooling capacity, in increments as low as one percent, for precise temperature control and lower humidity.


High efficiency is just the start. Those looking to reduce their energy footprint will find even more to like with the Lennox Signature XC25. The system is compatible with Lennox SunSource solar panel modules that will power your central-air system and can pass on any unused electricity to power other appliances in your home. Attaching a SunSource module to the XC25 qualifies it for solar federal tax credits that are available through 2021, as well as any local government or power company incentives. The system is compatible with Lennox's iComfort technology, including a Wi-Fi thermostat with cloud connectivity so that it can be adjusted remotely via the Internet using a smartphone, tablet or PC. The system also includes self-diagnostics that monitor the health of the XC25 and issue alerts if something is amiss. The XC25 is also quieter than most, with decibel ratings as low as 59.

Maintenance and repair

Solid reliability, but choose your installer wisely. Lennox just misses the top spot in ConsumerReports.org's long-term survey of central air conditioner reliability. Lennox is picky about who it allows to install its systems, and that helps keep its reputation strong. However, WebHVAC.com notes that central-air systems with modulating compressors need more care when being installed than other types. They add, however, that if you hire a qualified contractor with a solid track record, "this unit should give you 20+ years of service when maintained on a regular basis." The 10-year limited warranty isn't as long or as generous as that of some other central air-conditioner brands (for example, some makers offer lifetime coverage on the compressor) but is about what's considered to be typical in the industry. We also spotted some feedback that say if things do go wrong, it can take a while to get replacement parts.

Our Sources

Editors of WebHVAC.com, Not Dated

The Dave Lennox Signature XC25 Air Conditioner is the second-ranked central-air system here, just eclipsed by a Maytag model that's now discontinued. The high energy efficiency and compatibility with SunSource solar modules are notable pluses. Elsewhere on the site, a brief profile offers some highs, lows and recommendations regarding the XC25.

Editors of All Things HVAC, Not Dated

The XC25 takes the top spot in this review by a husband and wife team of HVAC contractors. "It has surpassed expectations and performance ratings, proving itself as the most reliable and efficient house cooling system of the year," they say.

Editors of EnergyStar.gov, Not Dated

The Dave Lennox Signature XC25 makes the list of the most efficient central air conditioners rated by the Energy Star program for 2017. All products bearing the Energy Star label must meet Environmental Protection Agency energy efficiency standards while still delivering the features and performance that consumers demand, but the products on this list are the most efficient of all.

Editors of ConsumerReports.org, Not Dated

The results of a survey of more than 14,000 ConsumerReports.org subscribers who purchased a central-air system between 2009 and 2016 are presented here. It includes popular brands, such as Lennox, but does not delve into specific models.

Contributors to Lennox.com, As of May 2017

We found more than 200 owner reviews of the XC25 at the Lennox site. Feedback is largely positive and it earns a 4.8-star rating. Reviews are vetted by a third-party service, Authentic Reviews, to help insure credibility.

Contributors to FurnaceCompare.com, Not Dated

FurnaceCompare.com has the largest collection of owner reviews of central air conditioners on the web. The Lennox brand as a whole gets worse reviews than most, with only 24 percent of owners recommending it. Most negative reviews focus on durability, and some complain about warranty service. However, while the XC25 has only two reviews, both give it top grades.

"Tim", Not Dated

While many central air contractors speak highly of the Lennox brand, All System Mechanical breaks from the pack. The major issue according to "Tim" is parts availability if things go wrong. Lennox parts are only available from the manufacturer, and it can "sometimes takes weeks to get parts." He also isn't especially pleased with their customer service, though specific issues are not detailed.

Recently Updated
Central Air Conditioners buying guide

What every best Central Air Conditioners has:

  • High efficiency.
  • Good value.
  • A solid warranty.

Read More »

Learn More »