There is no functional or performance difference between the Honeywell RTH9585WF and the RTH9585WF1004 model designations. The base string represents the core smart color thermostat series, while the specific four-digit suffix at the end denotes minor manufacturing revisions, packaging updates, or designated regional distribution channels. Both units share identical specifications, wiring layouts, and app integrations. Verification: Compare the product feature lists and manual instructions to confirm they match.
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