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Ducay · 01-01-2015, 10:05 AM

Its dead easy to be honest (depending on the furnace). The hardest part would be running additional wires to the thermostat, but if you have extra wires to use, whole job should take you like 20 minutes.

Dumbed down version for a normal forced air gas furnace running at 24Volts AC (which vast majority of Calgary is): Kill power to furnace. Check in furnace at panel which wires running from the thermostat are unused (they're normally capped and/or loose). Connect that wire to the C on furnace panel, then connect same wire to C on nest. Bingo bango you're done.

I did the same thing, had only Rh and W (power and heat) on both mine when I got the nests. Had additional 4 wires to spare (some buried in wall), connected the C as well as G (fan) and * (humidifier) to the nest and now I have pretty sweet control over the whole system. I lucked out the builder ran 2 runs of 3-wire cable to each thermostat, which was not really needed or common back in the 80s.

I'd start by doing the C as it is pretty easy and requires no additional "setup" or tinkering like the humidifier often does. Tonnes of resources online or just ask here.

01-01-2015, 10:05 AM	#4
Ducay Franchise Player Join Date: Feb 2006 Exp:	Its dead easy to be honest (depending on the furnace). The hardest part would be running additional wires to the thermostat, but if you have extra wires to use, whole job should take you like 20 minutes. Dumbed down version for a normal forced air gas furnace running at 24Volts AC (which vast majority of Calgary is): Kill power to furnace. Check in furnace at panel which wires running from the thermostat are unused (they're normally capped and/or loose). Connect that wire to the C on furnace panel, then connect same wire to C on nest. Bingo bango you're done. I did the same thing, had only Rh and W (power and heat) on both mine when I got the nests. Had additional 4 wires to spare (some buried in wall), connected the C as well as G (fan) and * (humidifier) to the nest and now I have pretty sweet control over the whole system. I lucked out the builder ran 2 runs of 3-wire cable to each thermostat, which was not really needed or common back in the 80s. I'd start by doing the C as it is pretty easy and requires no additional "setup" or tinkering like the humidifier often does. Tonnes of resources online or just ask here. Last edited by Ducay; 01-01-2015 at 10:07 AM.