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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