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You could also manually make a schedule using SetpointManager:Scheduled to have a SAT for winter and another SAT for summer. For instance, if you knew that from 10/15 to 4/15 the SAT was 60 ºF and the rest of the year it was 55 ºF you could do this. Or you could use SetpointManager:OutdoorAirReset if the SAT follows the outdoor temperature, ie over 75 ºF OA then SAT is 55 ºF, 50 ºF OA then SAT 60 ºF.