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I just bought a vacation home and I want to keep pipes from freezing in winter. The thermostat has R,R,O, black(W label) and G. I bought Honeywell RTH9585WF smart thermostat. Can I hook up AC and heat? Though only controlling heat remotely. WITH a 24v transformer? Option B (approved by Honeywell) is to switch out thermostat each change of seasons.

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  • Does your existing thermostat cable have any spare/unused wires?
    – brhans
    Commented Jul 13, 2023 at 16:32
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    A wire on O makes it seems you have a reversing valve, so a heat pump rather than AC. Either way it's still possible to control heat only using wires connecting R,C, & W, but giving o taking advice of how to do it is risky without seeing wiring diagrams from AC/HP, furnace, and existing stat terminations.
    – NoSparksPlease
    Commented Jul 13, 2023 at 17:29
  • Brands/models of all equipment involved, as well as clear, focused, well lit pictures of the wiring on all those devices will go a long way toward helping us help you. Just edit your post to include them
    – FreeMan
    Commented Jul 13, 2023 at 17:53
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    Got it. I’m not at property now. I know heat is Weil Mclane boiler. I don’t know AC. I’ll take pics and find out manufacturer and model nos. I’m pretty sure no spare/unused wires
    – Drewp
    Commented Jul 13, 2023 at 20:32
  • Added a few pics (I have more). I DO have spare wire (?make C wire?). I was looking at smart WiFi t stats that don’t need C wire (ecobee, sensi?). If I do add/make c wire, where do I attach at the boiler (Zone valves, transformer). I’m looking for a board that lists a c-wire. I do have voltage tester/meter.
    – Drewp
    Commented Jul 16, 2023 at 14:33

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