Honeywell - TH4110U2005/U - T4 Pro Thermostat, Programmable or Non-Programmable, 1H/1C. Programmable 7 day, 5-2, 5-1-1 or Non-Programmable, 1H/1C Heat Pump, Plus 1H/1C Conventional with push button programming, and filter change and low battery reminders.