If your floor is strong enough... Get some cheap 32-gallon trash barrels with lids at Home Depot ($14 here.) Fill them with water and put them in a spot where you can place your orchids. Put a shelf over the barrels and set your orchids on that. If possible drape something over the orchids and barrels, like clear plastic sheeting, all the way down to the floor.
The water in the barrels will stay at normal ambient temperature for quite a while during a power failure, especially if covered with the plastic. If you're home during the failure you can scoop some of the water into a kettle, heat it at your wood stove, then return it to the barrel.
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