Lennox Air Conditioner Review 2026

Lennox is the efficiency king of the AC world. The Dave Lennox Signature Collection SL28XCV is the most efficient residential air conditioner you can buy, with a 28 SEER / 25.8 SEER2 rating that no other major brand matches. But Lennox isn't just about the top end — the brand offers a full range from the budget-friendly Merit Series to the premium Signature Collection.

Lennox Product Lines at a Glance

Series	Models	SEER2 Range	Installed Cost
Merit Series	5 models	13.4–15 SEER2	$17,000–$20,000
Elite Series	6 models	15.3–22.4 SEER2	$19,000–$23,000
Signature Collection	2 models (XC21, SL28XCV)	Up to 25.8 SEER2	$22,000–$25,000

What We Like

• Unmatched efficiency: The SL28XCV's 25.8 SEER2 (28 SEER) rating is the highest in the residential market. No one else comes close.
• Broadest range: 13 total models across 3 tiers means there's a Lennox for every budget.
• Affordable entry point: The Merit Series starts around $17,000 installed — competitive with Carrier and Trane.
• iComfort smart thermostat: Lennox's proprietary smart thermostat integrates seamlessly with Elite and Signature systems for zone control and energy reporting.
• Quiet operation: The Elite and Signature units include SilentComfort technology with sound levels as low as 59 dB.

What Could Be Better

• Dealer-only equipment: Lennox equipment is sold exclusively through Lennox dealers, which can limit your options for competitive bidding.
• Merit Series is barebones: The budget line uses single-stage compressors with limited features.
• Warranty is standard: The 10-year parts warranty is good but doesn't match Trane's 12-year compressor coverage.

Lennox vs. the Competition

Feature	Lennox	Carrier	Trane
Max SEER2	25.8	24	21.5
Starting Price	~$17,000	~$20,000	~$18,000
Total Models	13	~10	4
Best Feature	Highest efficiency	Tech & smart home	Warranty & durability

The Bottom Line

Lennox is the brand to choose if efficiency is your top priority. The SL28XCV is in a class of its own at 25.8 SEER2, and the wide range of models means you can find a Lennox at almost any price point. The dealer-exclusive sales model can be a drawback if you want to shop around, but the product quality is consistently strong across all three tiers.