Bigboy2u: Yep, the cavity you're talking about is indeed open to basement with the third item being a Carbon Monoxide detector. From your posts the concern you seem to be conveying without stating it outright is the point of having two items in conflict, ie: A/C set for cooling down to 72F and furnace perhaps set for 72F and both running while you're out shopping. Could you adapt a 3 position switch to handle both items as thermostat and furnace are both low voltage. Perhaps, at worse case scenario, a couple of small relays would need to be employed in concert with 3 way switch so that you have power to only one thermostat at a time?
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Sandra, Bruce
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