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Low side: factory floors (CM* window minimums ~1-4 C, the ~16 C 'warming up' operating floor) and the planned cool_temp_min / cool_temp_start keys with a heater-driven warm-up phase. TEC: presence is undetectable (tec_on is write-only, Pro-only hardware on a common board) so tec_present becomes a user setting, with hysteresis control toward the factory ~18 C setpoints when enabled.