The Nest Thermostat Common Wire Issue

Aairco Air Conditioning & Heating carries and installs the Nest line of thermostats.

NEST thermostat

NEST thermostat

The Nest thermostat has an internal battery which can usually be charged by the 24v heating and cooling wires coming from your homes HVAC system. Problems arise when there are too many components borrowing from the same power source. The Nest learning thermostat is a power stealing thermostat which can cause system malfunction or improper system operation. The solution is to add what is known as a common wire, this wire is a separate 24 volt supply dedicated to charging your Nest thermostat. Although Nest claims this wire is not necessary with all installations Aairco Air Conditioning & Heating would highly recommend it to anyone using any smart thermostat. Installing a common wire can range in difficulty - if the thermostat wires are inaccessible from the power source walls may need to be opened or an alternative thermostat location may be suggested.

We offer Nest thermostat sales and installation. You can contact us to schedule or we are now offering services thru Amazon Home Services 

If you buy a new NEST or other thermostat brand from Amazon you can now book a installation appointment too.

About the Author


Leave a Comment