Is the Honeywell Pro Series thermostat compatible with my HVAC system?
The Honeywell Pro Series is compatible with most standard single and multi-stage heating and cooling systems. Compatibility depends on your specific HVAC configuration and the model you choose (T4 Pro, T6 Pro, Pro 3000, Pro 5000, or Pro 6000). Refer to the compatibility section in the manual or contact Honeywell support with your system details.
From the official Honeywell Thermostat Pro Series manual, page 1
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