How does the "swing" setting on thermostats work?

I'm in charge of programming the thermostat for a small building, and am not clear about the Swing setting. Apparently I can control how many degrees the ambient temperature must fall below the heat setting before the heat starts up. Is that correct? In other words, if the Swing setting is 3 degrees and the... show more I'm in charge of programming the thermostat for a small building, and am not clear about the Swing setting. Apparently I can control how many degrees the ambient temperature must fall below the heat setting before the heat starts up. Is that correct? In other words, if the Swing setting is 3 degrees and the heat setting is 62 degrees, once that temperature is reached, does the furnace shut off until the ambient temperature falls to 59 degrees? Thanks.
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