Carrier vs Lennox Central AC: What the Published Specs Say

Carrier and Lennox both anchor their lineups with premium variable-capacity air conditioners. This comparison lays out what each manufacturer publishes for its flagship so the specs can be read side by side. It does not pick a winner.

How to read this comparison

Efficiency, staging, and warranty are the three fields shoppers most often line up across brands, but the two companies do not always publish on the same scale. Carrier lists its flagship in SEER2, the metric standardized in 2023, while the Lennox SL28XCV page states a SEER figure. Warranty terms also cover different things, so parts and compressor coverage are worth reading separately.

Every number below is quoted from the manufacturer's own page. Where the two brands use different metrics, that difference is noted rather than converted.

Carrier's published specs

Carrier's flagship variable-speed unit is the Infinity 21 (26VNA1). The manufacturer publishes its top efficiency, its modulation range, and a registration-based warranty that gives the owner a choice of terms.

Carrier states the compressor modulates across a wide capacity band rather than cycling on and off at a single stage.

Lennox's published specs

Lennox positions the SL28XCV at the top of its Dave Lennox Signature Collection. The manufacturer publishes its efficiency as a SEER figure, describes a variable-capacity compressor, and lists a single warranty term for covered components.

Lennox states the unit primarily runs in low speed to hold steady temperatures.

Where they differ on paper

Both flagships are variable-capacity systems, so the design category is the same. The visible differences are in how each brand states efficiency and in warranty structure.

Carrier publishes its flagship in SEER2 (up to 21) while the Lennox SL28XCV page cites SEER (up to 28), so the two headline numbers are not on the same test scale and are not converted here. On warranty, Lennox lists a single 10-year term on covered components including the compressor, while Carrier offers a registered choice between a 10-year parts option and a parts-plus-labor option.