Step 4: Look closely for any of the following indicators on your old thermostat’s backplate:
If you find any of the above indicators, you should stop right here, as your HVAC system
might not be compatible.
In case of no such indicators, you can continue with the installation.
WARNING: Cielo Smart Thermostat only works with 24V AC. It does not work with line
(high) voltage or millivolt systems
Step 5: Grab your smartphone and take a picture of your old thermostat wiring.
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