This unit is listed as "Bosch IDS Light Series 3 Ton 20 SEER2 Ducted Central Air Inverter Heat Pump Split System - R454B" yet the specifications say that it is 15 SEER 2. PLEASE EXPLAIN.

The system is advertised as “up to 20 SEER2” because that rating reflects the maximum efficiency of the Bosch IDS Light series when properly matched, while the included BOVA-36RXB-M15S outdoor unit itself is only rated at 15 SEER2, meaning the actual efficiency of this specific combination will be based on that lower condenser rating rather than the headline value.

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