Thermostat

Looking to install a wifi digital thermostat. The original one I have is probably from the 60s or 70s. Does anyone know if I would need a new wire run from the furnace to the thermostat? Anyone recommend someone to do that type of work?

trini73diva

in General Discussion 3 years and 9 months ago

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brooklyndempsey | 3 years and 9 months ago

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In addition to nest, ecobee also have an option to run without a C wire, using a power module that is connected in the equipment and supplies power over the existing wiring. Both companies have compatibility checkers on their website so you can check your specific wiring. Also look at the install instructions to see if it is within your DIY comfort zone.

mozeeatupu | 3 years and 9 months ago

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If your thermostat only works when batteries are installed, then you’ll need a C wire.
Sometimes there already is a C wire going to the relay but not run up to the thermostat or mislabeled.

Lurker | 3 years and 9 months ago

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It completely depends on your HVAC system and the thermostat. If you have three wires (or more) one is the C-wire which is used to power the thermostat. If not there are adapters you can install but having a C-wire is ideal

arewedoneyet | 3 years and 9 months ago

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I have used Nest thermostats pretty much since they came out and have never had any issues. I’ve put them into houses using original wire that probably isn’t newer than the late 80s. Sometimes those wires don’t provide enough power but we’ve been able to provide more at the furnace end of things rather than re-running new wires.