Handyman Staff asked 7 months ago
Looking to upgrade the old Carrier 2 stage thermostat with a new smart Honeywell T9 Smart Thermostat. The Carrier thermostat is a Comfort Zone 2 and has only 4 wires, V+, VG, RS+ ad RS-. Is there a way to add the Honeywell in place of this Carrier without running additional wires?
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