How does the Sleep Timer work during cooling mode?
During Cooling or Dry operation, when the Sleep Timer is set, the thermostat setting is automatically raised 2°F every sixty minutes. Once the thermostat setting has been raised a total of 4°F, that setting is maintained until the set time elapses, at which point the air conditioner automatically turns off. (Page 9)
From the official Fujitsu Inverter Halcyon manual, page 9
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