“Can this replace old TH9421C1004? 2. CAN I PUT 3 OF THESE THERMOSTATS IN 1 HOUSE FOR 3 HVAC SYSTEMS ON 1 WIFI NETWORK? 3. CAN ALL 3 BE CONTROLLED WITH 1 APP? 4. WILL THEY WORK FOR HVAC PACKAGE UNIT (AC + HEAT PUMP/ ELEMENTS). THANKS IN ADVANCE!”
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I never had the thermostat installed, this is my second time answering this question.
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