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posted Jul 9, 2016, 1:30 PM by Quoc-Anh Vuong
Honeywell RTH221B
We replaced both thermostats today. The old one is a mercury control temperature switch, and it's not programmable so we put in the one which we can program to turn on/off 4 times a day, and this is to save utility money. It's a basic Honeywell RTH221B.