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Higher-efficiency matched pairs. These ratings come from the air handler as much as the condenser: a Trane 5TTR6 rates 15.2 SEER2 beside a 5TEM4, and up to 17.0 beside a Hyperion 5TAM5. Same outdoor unit, different system.

That is exactly why the tier belongs to the pair rather than to a model number. Each listing publishes the certified figure for its own combination, and the SEER2 savings calculator will tell you what the difference is worth against your own electricity rate.

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Not sure which pair is right?

Send us the model numbers you're weighing up and we'll confirm whether they're a matched, AHRI-certified set — or tell you if a load calculation is what you need first. We install this equipment, so you'll get a straight answer either way.