Dave Lennox Signature XC25 Review

Lennox Central Air Conditioner

  • Up to 26 SEER
  • Modulating compressor
  • Wireless, smartphone compatible control system
  • Solar-ready option
  • Expensive
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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 2015. The modulating compressor not only saves energy, but lowers humidity and keeps temperatures rock steady. The Lennox brand is well regarded, but the warranty could be better.

Breaking it down


Top ratings. The Dave Lennox Signature XC25 is the most energy-efficient central air conditioner in this report. With its top SEER rating of 26, it just edges out the Maytag M1200 PSA4BI iQ Drive and is efficient enough to earn 2015 Energy Star Most Efficient status. 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, as the experts a WebHVAC.com note, is "a very expensive air conditioner." Part of the reason for that cost 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 until the end of 2016 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. While Lennox isn't the top-rated brand in a large, long-term survey of central air-conditioner owners, its repair rate is on a par with other top-rated brands. Lennox is picky about who it allows to install its systems, and that helps. 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, but is at the low end of what's considered to be the standard in the industry.

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Our Sources

1. TopTenReviews.com

The XC25 earns the 2015 Gold Award and Excellence Award at TopTenReviews.com." An extremely high level of efficiency and low level of noise make this innovative unit a great choice," editors say.

Review: Dave Lennox Collection XC25, Grant Morgan, Not Dated

2. WebHVAC.com

The Dave Lennox Signature XC25 Air Conditioner continues its run here as the top-rated central-air system in 2015. 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.

Review: Top Rated Central Air Conditioners 2015, Editors of WebHVAC.com, Not Dated


Though it's not profiled on this page, the Dave Lennox Signature XC25 makes the list of the most efficient central air conditioners rated by the Energy Star program for 2015. 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 more efficient.

Review: ENERGY STAR Most Efficient 2015 — Central Air Conditioners and Air Source Heat Pumps, Editors of EnergyStar.gov, Not Dated

4. ConsumerReports.org

The results of a survey of almost 34,000 ConsumerReports.org subscribers who purchased a central-air system between 2007 and mid-2013 are presented here. It includes popular brands, such as Lennox, but does not delve into specific models. Most systems deliver good reliability, but some fare a little bit worse.

Review: The most reliable central air conditioning systems, Editors of ConsumerReports.org, May 2014

5. Lennox.com

We found nearly 75 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.

Review: XC25 Air Conditioner, Contributors to Lennox.com, As of June 2015

6. FurnaceCompare.com

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 22 percent of owners recommending it. Most negative reviews focus on durability, and some complain about warranty service. However, the XC25 is not specifically addressed.

Review: Consumer Reviews of Lennox Central Air Conditioners, Contributors to FurnaceCompare.com, Not Dated

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