“Can I replace Protech model 600 with this Honeywell RTH9585WF thermostat?”
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Hi Sean, to determine compatibility we will need to know more about the wiring of your previous thermostat. This thermostat works with most 24-volt heating and cooling systems with standard wiring. This thermostat will require a common (C) wire. If you need additional assistance feel free to contact us at 1-855-733-5465
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