Central AC System GuideLennox and Goodman sit at different points of the market, and their flagship air conditioners publish different top-end numbers. This comparison presents each manufacturer's stated specs side by side without declaring a winner.
How to read this comparison
The three fields below are top efficiency, compressor staging, and warranty. Both brands publish their flagship efficiency in SEER2, which makes the headline number directly comparable, but warranty structures differ in whether the compressor is called out separately from parts.
Every figure is quoted from the manufacturer's page. Treat SEER2 as an upper bound; the published numbers read as up to a given rating.
Lennox's published specs
Lennox's flagship is the SL28XCV in the Dave Lennox Signature Collection. It is a variable-capacity unit published at the highest SEER2 in this comparison, paired with the brand's Precise Comfort technology.
Lennox publishes a single 10-year limited warranty that includes the compressor.
Goodman's published specs
Goodman's variable-speed flagship is the GXV9S, a communicating inverter-driven split system. Its published top SEER2 sits below the Lennox flagship, and Goodman states a two-part warranty covering unit replacement and parts.
Goodman's lineup also includes a two-stage model, the GLXT7C, for buyers not going to full variable speed.
Where they differ on paper
Both flagships are variable-capacity systems published in SEER2, so the category and the metric line up. The visible gaps are in the headline efficiency and in how each warranty is framed.
Lennox publishes a higher top SEER2 (up to 25.80) than Goodman (up to 19), while Goodman states a two-part 10-year unit-replacement and 10-year parts warranty and Lennox states a single 10-year limited warranty that includes the compressor.