Nest 2 - wire installation
I have 2 Nests at my home in MA and 2 more at my place at the lake. In MA, they are 2 wire (heat only) installations. For one zone, I needed to use a resistor to jump between the red wire and common power input on the zone control board. The other worked fine without the resistor (different zone valves - I don't know why...they pre-date my ownership)
In NH, I needed to connect the c-wire to the air handler and T-stat - luckily, the t-stat cables each had an extra wire that I could use for the c-wire connection.
If you live in MA, you can get a great deal on Nest T-stats through Mass Save.
Both setups have been working without issue for 10+ years (MA) and 8+ years (NH)
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