Nest thermostat to replace old thermostat and humidistat

[saziz111]

I have an old Honeywell thermostat and a humidistat control beside it. I am looking to install the nest but i am having troubles with wiring. I can't find instructions anywhere on rewiring or what I need to do to have only one unit. Any suggestions?

[schocker]

Maybe see if this works to give you some starting info.
https://nest.com/ca/support/article/...ermostat#works

[killramos]

I think Nest requires "pro install" for humidifier control, not that you can't do it yourself its just a liability thing as incorrectly running a humidifier can cause a lot of damage to your furnace. But it means they aren't as forthcoming on the for dummies instructions. Google around i have found a pro install manual before if you are set on it.