You can buy on eBay. Seller is thesunnyvalesite. They have the exact transformer you need, which converts 120v AC to 24v DC...this will stop the thermostat from eating up your batteries, but still continue to install them so that the thermostat continues to operate if you lose power to your house. Thee two wires from the transformer should go to the 'c' and 'rc' terminals in the top section of the thermostat. There is plenty of wire on the transformer, so you can try to feed into the wall behind the thermostat up to the attic to an outlet, or down to the basement or some other room to an outlet. Good luck...post your outcome.
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