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If you would install a freeze stat in parallel with your wall mounted thermostat it would keep the temperature above freezing in your shop without having to adjust your wall mounted thermostat. At that point all you would need is an on off switch in the house to remotely turn on or off the wall thermostat in the shop. Just leave the temperature adjusted where you want it and turn it on or off from the house.
Ed
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It seems to me that all you want to do is remotely control the switch that selects between your two thermostats. Why not just replace the switch with a relay and have the powered position the "higher temp thermostat". When your in the shop you can bypass the relay. If I understand you just want to warm up the shop before you get there so you'd be activating the relay for say an hour prior to your arrival. If the system fails you automatically end up with the low temp thermostat so no big harm done. Cost is really minor as you have already done half the work.
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