RTH2300B1038 Honeywell 5-2 Day Programmable Thermostat W/ Filter Change Reminder. The Honeywell RTH2300B1038/E1 5/2-Day Programmable Thermostat with Filter Change Reminder features a series of highly intuitive options for customizing your thermostat’s schedule. This weekday and weekend programmable thermostat gives you the ability to program weekdays separate from weekends and comes equipped with four distinct program periods per day. Easy to navigate controls, enlarged buttons and a wide screen all come together in creating a seamless to operate programmable thermostat.