Universal Control with 3-Heat / 2-Cool Control for Gas / Electric / Heat Pump / Oil equipment. Auto Heat/Cool Changeover, or Heating Only or Cooling Only Configuration. Intuitive Setup Menu for Easy Configuration of Options. Built-In Economizer Function with Outdoor Temperature Threshold Adjustment. Pre-Occupancy Purge Capability of 1, 2, or 3 Hrs for California Title 24. Fresh Air Damper Control Option During Occupied Schedules.