Central AC System GuideRheem and York both offer high-efficiency variable-capacity air conditioners near the top of their lineups. This comparison presents what each manufacturer publishes, side by side, without declaring a winner.
How to read this comparison
The fields below are top efficiency, compressor type, and warranty. Rheem publishes its flagship efficiency in SEER2, the 2023 metric, while York's technical guide for its variable-capacity flagship states a SEER figure, so the two headline numbers are not on the same test scale.
Every figure is quoted from the manufacturer's own document. Where the metric differs, that is noted rather than converted.
Rheem's published specs
Rheem's high-efficiency air conditioners sit in the Endeavor Line Prestige Series. The manufacturer publishes their top cooling efficiency in SEER2 and notes EcoNet smart-home compatibility and the newer refrigerant.
Rheem's product page lists the efficiency and features but does not state the warranty term on that page, so warranty is left out here rather than guessed.
York's published specs
York's variable-capacity flagship is the Affinity Series YXV. York's technical guide states its efficiency, its compressor type, and a warranty that separates the parts term from the compressor term.
York's guide states the YXV at 20 SEER and lists a lifetime compressor term with registration.
Where they differ on paper
Both flagships are variable-capacity inverter systems, so the design category matches. The visible differences are the efficiency metric and the warranty structure.
Rheem publishes the RA19AY at up to 20 SEER2, while York's guide states the YXV at 20 SEER, a different test scale. On warranty, York publishes a lifetime compressor term plus a 10-year parts term with registration, while Rheem's product page states efficiency and features but not a warranty term.