I recently jumped into the wifi smart thermostat game and ended up installing a Honeywell RTH9580WF. The thermostat requires a C wire to be hooked up to your thermostat and your 24V AC transformer in your furnace. I initially installed a Nest thermostat, but after a week of use my Nest base unit shorted the red and green causing the fan to run non-stop. I’ll talk more about this in another blog post. I spent a ton of time trying to figure...