How does the STC-1000 decide when to switch from heating to cooling?
The thermostat switches to heating mode if room temperature ≤ set point - return difference (F2), and switches to cooling mode if temperature ≥ set point + return difference. The compressor will not start until its delay time (F3) is over.
From the official Haswill Stc 1000 Temperature Controller manual, page 2
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