Aprilaire 8554 - Manual (Page 13)

Setting Or Changing Cooling Temperatures
NOTE: Cooling temperatures must be set at least 2 degrees higher than heating temperatures.
(Example: If heating temperature is set at 70˚F, cooling temperature must be set to at least 72˚F or higher.)
If not set at least 2 degrees higher, the thermostat will automatically lower the previously programmed
heating temperature to maintain the 2 degree separation.
NOTE: Your event starting times are the same in the cooling mode program as the heating mode start
times. Example: If your program start time for the Morning “ ” event is 7:00 AM for heating, the
cooling start time is already programmed for
7:00 AM as well. Once you change the program
starting time for an event, the thermostat
automatically changes the starting time for
both the heating and cooling modes.
Step 1: Press and release the MODE button until
the word “COOL” and the “ ” cooling symbol
appear on display.
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