Lennox AC reviews generally put it at the premium end of the market: its SL25KCV carries the highest SEER2 rating among the major brands' central air conditioners (up to 26), it earned Excellent owner satisfaction in Consumer Reports' 2022 survey, and its warranty gives you a choice between longer parts coverage and a few years of labor. The trade-offs are price, a dealer-only sales model that ties parts and service to Lennox dealers, and the need for Lennox's own thermostat to get the most out of its top units.
This review is compiled from Lennox product brochures, its warranty documents and annual reports, and published survey data. We did not install or test the equipment. Check the current documents for the exact model you're quoted.
Who Makes Lennox?
Lennox International builds Lennox-branded equipment and owns Allied Air, which sells Armstrong Air, AirEase, Ducane, Concord, Allied and MagicPak through wholesale distributors. Those Allied Air brands are often a lower-cost route to Lennox-family engineering. Lennox's ductless lineup comes through Samsung Lennox HVAC North America, a joint venture announced in 2024.
The Lennox brand itself is sold directly to independent installing dealers, with no wholesale layer in between. That gives Lennox control over pricing and dealer training. It also means you'll usually buy, service and source parts through a Lennox dealer.
Lennox AC Lineup and Efficiency
Lennox splits its central air conditioners into three collections. All current models use R-454B refrigerant.
| Model | Collection | Max SEER2 | Compressor | Rated sound |
|---|---|---|---|---|
| SL25KCV | Dave Lennox Signature | 26.0 | Variable-capacity inverter | 58 dB |
| EL22KCV | Elite | 22.5 | Variable | 60 dB |
| EL18KCV | Elite | 19.5 | Variable | 67 dB |
| EL16KC1 | Elite | 17 | Single-stage | 72 dB |
| ML17KC2 | Merit | 18 | Two-stage | Not listed |
| ML14KC1 | Merit | 14.3 | Single-stage | 73 dB |
| ML13KC1 | Merit | 13.4 | Single-stage | 73 dB (northern states) |
The SL25KCV needs Lennox's S40 communicating thermostat to run as designed, and that's part of the price. Many older review pages still describe Lennox's R-410A models (XC25, XC21 and similar), so make sure the model numbers you read about match your quote.
Lennox Warranty: Warranty Your Way
Lennox structures its warranty differently from most brands, and it's worth understanding before you compare quotes.
Base coverage, no registration needed:
- Signature: 10 years parts and compressor
- Elite: 5 years parts, 10 years compressor
- Merit: 5 years parts and compressor
Register within 60 days and choose one:
- Parts extension (the default): 10 years total parts on Merit and Elite, 12 years on Signature.
- Labor option: 3 years of labor coverage, with parts at 7 years (Merit and Elite) or 10 years (Signature).
California, Florida and Quebec, plus Georgia for units installed from January 2026, don't require registration, and the parts extension applies automatically there. Labor beyond the optional 3 years isn't covered, so ask your dealer about their own labor warranty.
What Owners, Installers and Surveys Report
Survey data. Consumer Reports' May 2022 survey of members' central air systems gave Lennox an Excellent rating for owner satisfaction, alongside Trane, American Standard, Bryant and Carrier. Armstrong Air and Ducane, both Lennox International's Allied Air brands, earned Excellent predicted reliability. Consumer Reports updated its ratings in 2025, with brand results for subscribers only.
What owners commonly praise: quiet operation of the variable-speed models, even temperatures, and the top-end efficiency.
What owners commonly complain about: price, and, in reviews on consumer complaint sites, parts delays and labor bills on warranty repairs. Those reports are anecdotal, but they line up with the dealer-only distribution model: a non-Lennox technician may wait longer for a proprietary board or motor.
Lennox vs Carrier
| Lennox | Carrier | |
|---|---|---|
| Parent company | Lennox International | Carrier Global |
| Top AC efficiency | 26 SEER2 (SL25KCV) | 21 SEER2 (Infinity 21) |
| Tiers | Merit, Elite, Signature | Comfort, Performance, Infinity |
| Compressor options | Single-stage, two-stage, variable | Single-stage, two-stage, variable |
| Communicating control | S40 Smart Thermostat | Infinity System Control (up to 8 zones) |
| Refrigerant | R-454B | R-454B (Puron Advance) |
| Registered warranty | 10-yr parts (12 on Signature), or 3-yr labor option; register within 60 days | 10-yr parts, or 5-yr parts plus 3-yr labor; register within 90 days |
| Unregistered | 5-yr parts on Merit and Elite; 10-yr on Signature | 5-yr parts |
| Distribution | Direct to Lennox dealers | Through distributors to Carrier dealers |
| Lower-cost sister brands | Armstrong Air, AirEase, Ducane | Bryant, Payne, Heil, Tempstar |
| Consumer Reports 2022 owner satisfaction | Excellent | Excellent |
Rated sound levels aren't directly comparable across brands, because manufacturers measure them at different operating points. Lennox lists 58 dB for the SL25KCV, while Carrier lists the Infinity 21 "as low as" 55 dB at its lowest speed.
Choose Lennox if you want the highest efficiency available, you live where a long cooling season makes 22 to 26 SEER2 pay back, and you have a Lennox dealer you trust for the long term.
Choose Carrier if you want a broad dealer and parts network, the option to shop a sister brand like Bryant for a similar system, or a lineup where the top variable-speed model costs less than Lennox's flagship. Our Trane vs Carrier breakdown guide covers Carrier's lineup in more depth.
Lennox Furnaces and Heat Pumps
Lennox sells matching gas furnaces from 80% AFUE up to the SLP99V at 99% AFUE, which the best furnace brands guide compares with other makers. Its top heat pump, the SL22KLV, is rated up to 21.2 SEER2 and 10.5 HSPF2 with cold-climate operation to -20°F. See the best heat pump brands comparison for how that stacks up.
Questions to Ask a Lennox Dealer
- Which collection is this model in, and does it need the S40 thermostat?
- Will you register it within 60 days, and which Warranty Your Way option do you recommend for my situation?
- What labor warranty do you include beyond Lennox's coverage?
- How quickly can you get proprietary parts like inverter boards and blower motors?
- Did you size the system with a Manual J load calculation?
Price depends on the collection, tonnage, line set and electrical work, permits and local labor rates. Our central AC cost breakdown guide covers those factors, and the guide on how to choose an HVAC company helps you vet the dealer. For the wider market, see the best AC brands compared.
Frequently Asked Questions
Is Lennox a good AC brand?
Lennox is a premium brand whose SL25KCV (up to 26 SEER2) has the highest efficiency rating among the major brands' central air conditioners, with a full lineup down to basic single-stage units. Consumer Reports' 2022 member survey gave Lennox Excellent owner satisfaction. Its dealer-only distribution means parts and service run through Lennox dealers, so pick an installer you're comfortable with long term.
Is Lennox better than Carrier?
Lennox has the higher efficiency ceiling (26 SEER2 vs 21 for Carrier's Infinity 21) and a base parts warranty on its top tier that doesn't depend on registration. Carrier has a larger distributor network, sister brands like Bryant, and a simple 10-year registered parts warranty with an optional labor trade. Compare the specific models and dealers you're quoted.
Do I need to register my Lennox AC?
Registration within 60 days unlocks Lennox's Warranty Your Way options: extended parts (10 years on Merit and Elite, 12 on Signature) or 3 years of labor with a shorter parts term. California, Florida, Quebec and, for units installed from 2026, Georgia get the parts extension automatically.
Who makes Lennox air conditioners?
Lennox International, based in Texas, builds Lennox equipment and also owns Allied Air, which sells Armstrong Air, AirEase, Ducane, Concord and Allied. Lennox ductless systems come through Samsung Lennox HVAC North America, a joint venture formed in 2024.
Why are Lennox parts harder to get?
Lennox sells its branded equipment directly to independent dealers rather than through wholesale distributors, so many repair parts move through Lennox's own channel. Owner reviews on consumer complaint sites mention parts delays when using a non-Lennox technician. Common parts like capacitors and contactors are usually generic.