Honeywell FocusPRO TH6220D1028 Programable Thermostat 5-1-1 Programmable Thermostat. Provides electronic control of 24 Vac conventional and heat pump systems or 750 mV heating systems. Features: Weekday/Weekend programming - use as a 5-1-1 (Weekdays, Saturday, Sunday) or 5-2 (Weekdays, Weekend) programmable thermostat, whichever best fits your lifestyle. Large, clear, backlit display - easy to read in various lighting conditions. Display size options - available in large screen or standard. Precise comfort control (+/- 1ª F) - maintains consistent comfort to the highest level of accuracy. Simplified programming and operation. Easy change battery door - flip out door allows for easy battery replacement without removing or disassembling the thermostat. Built in instructions - simple, pull out instruction manual. Energy savings - program to save up to 33%* on annual heating and cooling costs. Adaptive Intelligent Recovery - ensures programmed temperature is reached by programmed time. Temperature range stops - prevents user from setting the temperature too high or too low. Had new HVAC unit installed and technician did not have the OEM t-stat so it was installed and used for 1 week.